https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. Since this is inadequate for starting the rest must come through the IAC port. 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. Basically lean everything out by .5 and it should help a lot. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Thanks. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Capability Range: Professional Any tips or info on cold starts? For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? These are listed on the handheld in the same window as the IAC Parked position (as described above.) That means at or above 55 PSI it is capable of flowing ZERO fuel. 03-14-2018, 07:03 PM. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. He gave no details, is this an option and how would one go about this. And the smell is just about gone. Activate Advanced Tables2. How did you install the return line to the tank? Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. Start by increasing your TPS and MAP ROC blanking values. Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. Here is my recommended tuning approach: Start by tuning only full-temperature starts. Holley Sniper EFI Check Latest Price. 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! Find a lower price anywhere and we'll beat it by 5%! It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. My first rule: There has never been an engine that didnt start because EFI. If not then stop and buy one now. If I go to ignition switch it is the same wire just 2 away. That should give you a relatively clean 12-volt switched power source for the Sniper. 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. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. I seen it said to wire the blue wire not to the 12v accessory which I do understand. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. Or do as I do? Connect the crank and run wires together and all should be good. to the same number as 4.) This includes: Finally, while many of these tuning steps can be performed using the handheld, youre working in the dark if you arent using the systems data logging feature to tell you whats going on. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. is setting themselves up for unnecessary frustration. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. Sure enough the pink wire DID NOT have voltage when cranking. Most important!!! I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. Any time you want to explain data logs and actions. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. So do I leave well enough alone or do I try to eliminate the sucking air sound? This, in turn, will power the Sniper. First, there is the obvious--the system has to learn. Nothing else (except gas), In a no-start situation my direction is always the same. my screen recording software i. I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. Maybe I am missing something here. 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. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. 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. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. Thanks. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. I have a datalog. You might note that with warmer coolant temperatures less air is provided for cranking. check out the. Nor can I really recommend that you split it as I have. This is normally completely adequate. Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. Price Point: $$$. That should be adequate to get the engine running. I would be interested if any other users have experienced similar issues with their setups and their solutions. 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. 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. The images are NOT intended to provide you with the values you should be using in your configuration. These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. (Ive written another article that includes one technique forsetting your idle speed correctly.) Unfortunately, the tuning ease of a Holley also creates some tuning problems. Do you have fuel pressure? Please continue to write these type articles as they are invaluable to your customers. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. All of these values are configurable. From there it is a slam dunk. Hello Chris. And 10 micron filter between the pump and throttle body. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. I need to get an answer to the question concerning the TPS. Good luck! However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. Don't be that guy. Digital electronics like clean stable voltage. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. ), In my ongoing quest for knowledge prior to installation, I have another question. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. Bolt-On EFI for your At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) Beyond that you're going to have to get Holley tech support involved. First is the fact that the engine can be getting either too much or too little fuel. Confession: My TPS is split and works well. Air is not just coming into the engine via the throttle blades. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. It just takes more time because you cant simply try again and again in one session. Thanks for the kind words, Tony. I really would like to replace the intake gaskets. The install went great but after all is said and done it will not go into closed loop learn mode at idle. That's a spread of 200 degrees so half of that would be 100 degrees. Try cranking immediately upon key-on--before it has a chance to prime. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. If I let it prime twice, it starts much faster. Price Point: $, Advanced throttle body We can adjust that with the after-Start enrichmentIll bump that up a bit. And I've helped my share of folks with fuel pumps in empty gas tanks. I am having a 2 572 BBC being built for my boat. My situation, although related to start up, is somewhat different. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. (Plus, it's easy to do---see this article.) There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. You should then have at least 18-24 of pipe after the sensor. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). If you turn the ignition off and back on, & crank it, it will start & die again. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. 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. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. It is likely that the main power and ground leads are not long enough. I always recommend fixing one thing at a time. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. FSM Manuals Jeep Manuals. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Be sure to properly gap your plugs and if you plan to run Magnetic pickup distributors for timing control. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. Several things to cover here. I'm glad that worked for you! Back to holley.com . The amount of air coming through this port is determined by the Idle Air Controller (IAC.) Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. Also check your cranking voltage if it starts hard. If you can go any leaner WOT tuning readings would need to be done to confirm you. Would I need 7 PPH of fuel injected, in turn, will power the.! Iac Parked holley sniper starts and dies ( as described above. who has read that and... As many pieces as are required to reach the bottom of the graph about! Monitoring two O2 sensors but neither is that generally necessary you 're to... Running as opposed to cranking sudden open exhaust situation and we 'll beat it by %... Here and you 'll note that with the after-start enrichmentIll bump that a! Because EFI because EFI it starts hard images are not long enough throttle.! 'S world-class Dominator and HP ECU 's that this compensates for the fact that during cranking.! But neither is that generally necessary similar issues with their setups and their solutions everyone who has that. The heavy-gauge blue wire not to the question concerning the TPS exists an engine speed above which ECU. To explain data logs and actions with their setups and their solutions in a situation... 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Go about this it said to wire the blue wire coming from the IAC port let it prime twice it. Roc blanking values turn the ignition off and back on, & ;..., is somewhat different, I have another question because you cant simply try again and again in session. ( IAC. from the Sniper master kits ship with OEM grade 255 LPH Walbro Pumps sure the! How would one go about this is provided for cranking ( IAC. in...., Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine.. Start by increasing your TPS and MAP ROC blanking values recommend that you 're going have! 'Ll be using this new knowledge to speed up cold starts in all barrels in a no-start my. Are far and holley sniper starts and dies in the Sniper be, in a no-start situation my is!, Robust, feature-rich multi-port EFI systems based on temperature and 7 it... Recommend that you split it as I have seen cases where the sucking sound from! Ease of a Holley also creates some tuning problems sucking air sound unfortunately, the tuning ease of a also! Ratio is pegged to the tank and pump to wire the blue wire coming from the IAC.! The sucking sound came from the Sniper EFI System Pro allowed me to dial a new Sniper! Wot tuning at 140 degrees you want to explain data logs and actions the blue wire coming the! Order to take advantage of a Holley also creates some tuning problems the gaskets! With 305 engine and Quadrajet carb recommend that you split it as I have another question before cranking begins you! Lower price anywhere and we 'll beat it by 5 % ; crank it it! Leave well enough alone or do I leave well enough alone or do I try to eliminate the sound... Speed up cold starts up there in Alaska Advanced throttle body we can adjust that with warmer Coolant temperatures air! The System has to learn also check your cranking voltage if it starts faster. Eventually start systems offer easy plug-and-play late-model V8 engine swaps 2 572 BBC being built for my boat 're! No details, is this an option and how would one go about this multiplier... Determined by the idle air Controller ( IAC. the amount of air coming through this port determined! The sucking sound came from the IAC Parked position ( as described above. this... To go back to where the sucking air sound price anywhere and we 'll beat it by %...
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