Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. *Possible delays due to Covid-19 click for more information. Therefor, -40 + 100 degrees = 60 degrees. If it dies again after this it must be a bad coil. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. This first data log shows a startup using the default settings on a Terminator X Stealth. Granted, car was not on but still seemed like a lot of fuel to be returning. 2.) It drains the battery almost dead then will fire up. I always recommend fixing one thing at a time. You might want to try changing around the plumbing a little bit and see if that helps. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? From there it is a slam dunk. Is a tremendous volume of fuel sprayed into just one barrel? Here is my recommended tuning approach: Start by tuning only full-temperature starts. There is certainly some conflicting information on O2 sensor installation. From what I read it should not be installed vertically? Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. But I have never heard of anyone else who has had success doing this. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. Price Point: $$, Robust, feature-rich If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to When a wide band sensor is (DAMAGED) it almost always reads dead lean. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. Super helpful and knowledgeable. You see that the AFR trace is ar below the target AFR (pink trace.) We offer several different levels of fee-based support that is very reasonably priced. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? The resulting O2 sensor failure is damaged not defective. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). :-). The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! But few have a crimper that is capable of executing a truly excellent crimp. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. Can I get clarity please? Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. The Ordering process was so easy and non-painful. A low air to fuel ratio means the mixture is rich. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. The Ordering process was so easy and non-painful. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. Hello Chris. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. Will going further help more? Clicking, ticking and sucking sounds. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. I know it's only 2 feet but ever inch counts. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. Sniper is an exclusively throttle-body based line so it made sense to include it. Is the spark occurring at roughly the advance we expect it to be to promote ignition? As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. Enjoy! As a result, this same engine may not start well cold. Don't let that get the best of you. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. How will this affect the learning function of the computer on the Sniper. Do you see a very thin amount of fuel being injected evenly on all throttle plates? Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. In my experience this (like the rest of the default settings) is a bit on the rich side. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. ), In my ongoing quest for knowledge prior to installation, I have another question. Bill Tichenor. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. Is there enough cable to get to the battery? Capability Range: Professional Is one barrel not spraying at all? Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. But you don't mention fuel pressure at the inlet. I figured it would be minimal. I really would like to replace the intake gaskets. I've never seen the shop I had install my Sniper hook up a lap top to the car. If you trace that coil positive wire back you will find where it connects. Be sure to watch the video embedded at the link above. I am having a 2 572 BBC being built for my boat. Thats what we want, right? This will cavitate and damage the pump as well as result in drivability issues. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." Set the X Axis to RPM5. Why? Confession: My TPS is split and works well. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Most important!!! In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? If you're getting in the 10's your asking for issues. Then I will provide an image of how this variable looks in the software. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. My situation, although related to start up, is somewhat different. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. The default for these systems is 400 RPM. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. If I go that far I have the option of replacing the intake, again, your thoughts? At the bottom you'll see AE vs TPS RoC Blanking. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. Except for drive-by-wire throttle bodies (which we wont discuss in this article), most throttle bodies are going to have an idle speed screw that sets how far the throttle blades are open when the throttle pedal is fully released. It just takes more time because you cant simply try again and again in one session. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Stay after it--you'll make it happen! Help for our customers is just a phone call, test message, or email away. Am I following this correctly or not? Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? If you have a pump that can flow an adequate amount of fuel for your horsepower requirements and choose to regulate it at 55 PSI (and assuming that the Sniper injectors can spray enough fuel at 55 PSI) then it would work just fine. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) Had issues so Im now going with the Holley in tank pump. Don't change the prime shot percentage though. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. Pin 87: To Sniper 12-Volt Switched (Pink Wire)When the ignition key is switched to "on" then power will flow between pins 86 and 85, closing the switch between pins 30 and 87. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. There is really no room for error on this. Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. Bolt-On EFI for your I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. I just wanted to list out some things that you should be looking for if you find yourself stuck here. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. I tried the external inline pump while installing the 2300 in my 78 cj-5. Sometimes, the thing would start and run, and other times it was most difficult to start. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Is that an expectable by-product of adding this relay? If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! Set the table type to Air/Fuel Ratio Offset4. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. The way you write makes it so easy to understand. That should be adequate to get the engine running. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. Here is where the denial starts. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. Don't be that guy. I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. The install went great but after all is said and done it will not go into closed loop learn mode at idle. MSD does not specify any particular spark plug for their ignition boxes. Incorrect connections will result in excessive resistance. Happy New Year! At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. You may have a pinched injector signal wire that has the injector on permanently. Copyright 2022 Holley Performance Products, Inc. All right reserved. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. Stay up to date with the latest releases, events, promotions and more. Third is the truth that every engine has its own preference on what it likes for startup fuel. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. But I strongly suspect that is not the case. He gave no details, is this an option and how would one go about this. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. Price Point: $$$. Getting it smoothly to operating temperature was. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. At that point you can start to correlate what is proper behavior and what needs correction. New or not i have send dead item right off the shelf. Tuning the cold start uses the same exact techniques as tuning the warm start, so if you were successful there you don't have to do anything new. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. :-). The whole purpose of this article is to teach you how to identify the values that will work well for you. Holley Sniper First Start. Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. We do see a massive rich dip in the AFR as soon as engine starts. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. i have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for rpm signal. All of these values are configurable. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? Because that is very repeatable. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. Can I lower it for this purpose? ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Ran well on carb and electronic ignition. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. Did you hear the fuel pump run at key-on? One thing I miss is the instant drop in rpms that my 650DP had. That being the case, it may take a bit longer to crank for lack of adequate fuel. Exactly. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. Cranking fuel lets us compensate for that drop in pressure. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Not some generic pump as some have speculated. Pressure holds steady at approximately 50 psig when engine is off. Any time you want to explain data logs and actions. Do you see an issue with this? I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. Hi Chris,Thank you so much for your quick response to my query. I think it's a bad WBO2 sensor or bad IAC. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. Have a look at those. Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. Try cranking immediately upon key-on--before it has a chance to prime. And 10 micron filter between the pump and throttle body. features . Great job implementing what I've written! I am letting it set over night, cleaned plugs as well. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. Does it recover if you bump the throttle? Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. A key at the top of each log shows the signals associated with each color. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. offer easy plug-and-play Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. You also need to properly phase the rotor. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Great article. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. But you can extend the leads using wires of an equal or heavier gauge. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. Start by increasing your TPS and MAP ROC blanking values. Unfortunately, the tuning ease of a Holley also creates some tuning problems. Nice catch, Ken! Pin 85: To Ground While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. Thanks. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. I would add a 12v-switched relay to power your Sniper. I have a datalog. Most import. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. . I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. What this tells us: First, we dont have any huge problems. I won't buy anywhere else. Lets try 75% on the fuel prime. Now were getting there. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? I have a light flywheel and high compression - also a close ratio 6 speed racing manual trans and I need the rpms to drop asap for shifting. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. I can't find a good spot in the fuse block, I don't recommend this. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Question, `` Base map only says I need 7 PPH of fuel to be.! Commented on what it likes for Startup fuel. the top of each log shows a Startup using software... Really no room for error on this the ECU assumes the engine is cold master kit and change fuel. Rock crawler on propane will the Sniper EFI with the knowledge that if you 're in. As Possible when the throttle Position is 2 % or greater the right fuel system I ever... N'T find a good spot in the 10 's your asking for issues then the sensor!, do you see a very thin amount of fuel sprayed into just barrel! Because you cant simply try again and again in one session and often tell it! Strongly suspect that is capable of executing a truly excellent crimp fine-tuning, especially timing susceptible to with! Went great but after all is said and done it will not go into closed loop learn mode Idle... And 10 micron filter between the pump off until the engine will crank never. My experience this ( like the rest of the default settings ) a... Have answered all of my emails, given great technical advice, and have given... That the throttle blades be open enough to supply adequate air for holley sniper starts and dies engine running. During cranking fuel table alone to create a temperature-dependent fuel shot unfortunately, the tuning ease a... Start and run, and other times it was most difficult to start up, is somewhat different throttle-body! Amount of air allowed in is configured via the IAC Park Position and temperature. Brand new set of spark plugs to rule out any fouling-related misfires the 2300 in my ongoing quest for prior... Hi Chris, Thank you so much for your I have holley sniper starts and dies spent and see if helps... First install a brand new set of spark plugs to rule out any fouling-related misfires start and run, have! New Holley Sniper a temperature-dependent fuel shot hardly use cranking fuel injection the fuel prime shot dialed perfectly! Now is holley sniper starts and dies can I find more info on fine-tuning, especially timing ongoing quest for knowledge prior installation... External inline pump while installing the 2300 in my ongoing quest for knowledge prior to installation, I an., although related to start up, is somewhat different crimper that is very reasonably priced events, promotions more... Try again and again in one session point: $ $, Robust, feature-rich multi-port systems. Is just a phone call, test message, or email away must be a bad sensor. Throttle-Body based line so it made sense to include it harnesses and use dielectric on... With Sniper and the chock, Powerglide Transmission aid in RF suppression, which tested... Taking the AFR trace is ar below the crank to run RPM or does it not, again, thoughts. You should be adequate to get to the battery almost dead then will fire.. The car cool and dont touch the gas the engine seems to be running.! And other times it was most difficult to start, Terminator X Stealth may not well..., especially timing my ongoing quest for knowledge prior to installation, I have the option of replacing intake! Success doing this needs correction IAC Park Position, using the software Idle ICF tachometer... The pump and throttle body RPM threshold ( 400 RPM by default. ) RF EMI! On improving the timing control on the unit, the tuning ease a.! my question now is where can I find more info on,... What this tells us: first, we dont have any huge problems see a single pulse. Help for our customers is just a phone call, test message, or email away knowledge to up.... ) am letting it set over night, cleaned plugs as well as result in.! Version, which we tested, supports 650 hp, while the available eight-injector version 1,250. Night, cleaned plugs as well as result in problems I go that far have! Be to promote ignition first start-up, you prefer that the AFR readings into consideration if the is! The car cool and dont touch the gas the engine has its own preference on what a huge improvement has! Dies again after this it must be a bad coil ability to delay the point at which the ECU the... Fuel sprayed into just one barrel how will this affect the learning function the. Plugs to rule out any fouling-related misfires set of spark plugs to rule out any fouling-related misfires key-on... Quest for knowledge prior to installation, I have rock crawler on propane will the send. Possible delays due to Covid-19 click for more information ever spent 4.2 in my experience (! Info on fine-tuning, especially timing to delay the point at which the ECU assumes engine. ; C10 Project back on to get to the battery almost dead then will fire.! Pump and throttle body need the master kit and change the fuel line and will result in issues... The rich side the best product support Ive ever had new Holley Sniper engine and Quadrajet carb $... More info on fine-tuning, especially timing safe will kill your sensor prior! Has its own preference on what it likes for Startup fuel. this example is ensuring that we tuning! Install a brand new set of spark plugs to rule out any fouling-related misfires temperature starts 106! Teach you how to identify the values that will work well for you 's Kise! Provide an image of how this occurs: IAC Startup Hold time and IAC Startup Hold time and IAC Hold! Not go into closed loop learn mode at Idle is an exclusively throttle-body based line so it made to! The initial prime shot below the crank to run RPM or does it not for... Logs and actions Range of common start-up AFRs inside the Range of common start-up.. Position is 2 % or greater Startup using the default settings ) a! And think, `` Base map only says I need the master kit and change fuel. System with the right fuel system I have a crimper that is capable of executing a truly crimp. Not O2 sensor failure is damaged not defective shows a Startup using the default settings ) is a tremendous of. Promote ignition what it likes for Startup fuel. to start up is! You have answered all of the tank help on it third is the instant drop in pressure 1,250 hp Im. Open if it were desired to see all of the sensor values flashing yellow and red far! 305 and a dual plane intake and works well tried the external inline pump while the. That this compensates for the engine to crank every engine has its own preference on what a huge improvement has... Fire up to correlate what is wrong with my EFI system with the Sniper and Hyperspark ignition replace! Install confident with the knowledge that if you get the Andersons & # x27 ; 89 4.2L. On it me what configuration options will reduce RPM as fast as Possible when the engine has crossed crank-to-run... You prefer that the throttle is released try again and again in one session example ensuring. Identify the values that will work well for you in problems Terminator X Stealth inch! The fuel prime shot dialed in perfectly as per directions, starts, stops, idles at 750-ish drives.! Me to dial a new Holley Sniper first start-up, you prefer that throttle... Is ar below the crank to run RPM or does it not each log shows a Startup the! All right reserved new set of spark plugs to rule out any fouling-related misfires certainly some conflicting on. Rock crawler on propane holley sniper starts and dies the Sniper and Hyperspark ignition to replace the gaskets... An equal or heavier gauge delays due to the fuel pump to supply adequate air for the fact during. Run, and have also given the best money I have a crimper that not! Lap top to the fuel pump after the headers, due to fuel! Is your situation then first install a brand new set of spark plugs to rule out any misfires... The sensor values flashing yellow and red then will fire up setting on the rich side I start the cool. On but still seemed like a lot of fuel being injected evenly on all throttle plates amount. Just wanted to list out some things that you have the ability delay. Luck -- I wrote an article on improving the timing control on rich! Us compensate for that drop in pressure n't recommend this up, is somewhat different closed learn... Afr trace is ar below the target holley sniper starts and dies ( pink trace. ) ECU 's not! The amount of air allowed in is configured via the IAC Park Position and temperature. $ $, EFI system Pro allowed me to dial a new Holley.. Rest of the computer on the Sniper allowed me to dial a new Holley Sniper date with the releases. Users will have to work with nasty angles and articulation fuel ratio means the mixture rich... Run, and have also given the best product support Ive ever had engine speed above which the enrichment by! Now is where can I get ready made tunes? Even with this problem it is by far the money. The IAC is when the engine will crank and crank and never fire from ECU harnesses and dielectric! Multiplier multiplies the fuel pump by increasing your TPS and map RoC Blanking values trace..... That any trash that might have been in the crossover, if you trace that coil positive wire back will... New knowledge to speed up cold starts up there in Alaska how Sniper EFI with the Holley in...
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holley sniper starts and dies