MSD does not specify any particular spark plug for their ignition boxes. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. Sure. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. Capability Range: Professional Im not looking for timing control just upgrade to EFI. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. No timing control. It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. Thank you for your ongoing support. Yes, I have fuel pressure. Fuel must also be added to start the engine. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. We offer several different levels of fee-based support that is very reasonably priced. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. But let me elaborate a bit. EMI is what wipes out all the electronics. I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. Fyi both fuel pump rocker switches have momentary primes. Happy New Year! I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. my screen recording software i. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. I'm all eyeballs! Not some generic piece as some have speculated. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. This is a bit tricky. Run the switched 12-volt back as close to the ignition as possible. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Lets try 75% on the fuel prime. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Sniper is working pretty well after using your idle setting procedures. Does pressing the throttle slightly allow the engine to start. 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. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? Don't let that get the best of you. Both of these are easily corrected. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. You may have an injector connector that has come loose.A final note that I can't emphasize enough. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. Make sure the fuel pump is properly mounted and picking up fuel. I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. When you remove a spark plug is it bone dry or dripping wet? Capability Range: Advanced This is obviously an ongoing process. Ill check the coil and see if anything else is attached. But you note that the after-Start enrichment (lower green trace) is starting while were still rich. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. I have purchased two sniper EFI with the MSD distributor kit. Not much I can add to that. Is a tremendous volume of fuel sprayed into just one barrel? Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. It just takes more time because you cant simply try again and again in one session. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. How efficient is your engine startup? More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. He gave no details, is this an option and how would one go about this. First, don't get too worked up about the flashing yellow and red values. I can't find a good spot in the fuse block, I don't recommend this. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. I want to start by saying that the engine should not require any IAC air bypass to idle. I'm trying to get this article done. 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. I am guessing you have some sort of current loop going on. 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. If you don't show any fuel pressure then fix that. Also, I have not made any adjustments other than playing with the fuel prime. 03-14-2018, 07:03 PM. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. Will going further help more? Hello Chris. 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. 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. Too little opening and the engine risks not having enough air to start. I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. You accidentally wired the switched 12V to the accessory side of the ignition switch. The intention is to draw your gaze to something that requires attention. No, it did not help. Like its legendary 4150 carburetors, Holley's Sniper EFI is a clear choice for so many builds that there's no way for it not to take our top . Sniper is an exclusively throttle-body based line so it made sense to include it. Seems like thats what its doing. Does it recover if you bump the throttle? And the less correction you do until you understand that---the better! Installed my Sniper, went through the startup procedure. Connect the crank and run wires together and all should be good. 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. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. At the bottom you'll see AE vs TPS RoC Blanking. I just moved it to the ignition terminal on the fuse block and voila, it ran. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Enjoy! These settings will be instrumental to a fast start. 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. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! First, there is the obvious--the system has to learn. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? The install went great but after all is said and done it will not go into closed loop learn mode at idle. Capability Range: Professional So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. Whats the fix? As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. If not then stop and buy one now. What this tells us: First, we dont have any huge problems. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. This is a value that you dont have to nail the first time you try it. 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. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. In most cases you just hit the key at that point and it's happy dance time. Go Gators. Pin 30: To Battery They will result in drivability issues, including idle control problems, and could possibly damage the ECU. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. I have it disconnected to flush any debris out.Thank you. Can I use this for the return.Thanks for the help, Lets dig down into that a bit and see if we can help. If it does not idle down your throttle is open too far or you have a vacuum leak. Can I get clarity please? I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. For the Sniper it is best to run resistor plugs. If youre OCD you could go on forever but this is going to work well for anyone. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Maybe I am missing something here. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. 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.) And I've helped my share of folks with fuel pumps in empty gas tanks. How will this affect the learning function of the computer on the Sniper. 4.56 rear gear and total weight is 2825 with me. When a wide band sensor is (DAMAGED) it almost always reads dead lean. 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. How will this setup work? 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. If your O2 sensor is pegged lean, then replace it. I really want to go EFI this year. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. Once engine is warmed up been driving for awhile. Price Point: $$$. EFI Systems based on Holley's world-class Dominator and HP ECU's. That is pretty straight forward. FSM Manuals Jeep Manuals. Are you running timing control? Most current pump fuels boil around 130 degrees. The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. Fires up & runs perfect. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. My situation, although related to start up, is somewhat different. No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. 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 RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. If the fuel pressure is a little low don't worry about that. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. We offer two potential solutions. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) Price Point: $$$. Incorrect connections will result in excessive resistance. However, each engine is different. I plan on converting to efi this coming spring. You just have to go one direction and see if things improve or not. 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.) Gary. Another great dissertation. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Sometimes it would catch itself, other times it would stumble and run out of breath. :-). This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. Am I following this correctly or not? Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. But few have a crimper that is capable of executing a truly excellent crimp. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. Capability Range: Moderate He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. Don't be that guy. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) I have been looking at all efi units and I keep coming back to the Sniper. Great work! Had issues so Im now going with the Holley in tank pump. 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. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. About the flashing yellow and red values rock crawler on propane will the Sniper kit work fine will. Iac hold: how far open the IAC motor to close and create less air to. An option and how to make the specific tweaks enrichment ( lower green trace ) is starting while were holley sniper starts and dies! Flood the engine risks not having enough air to start the engine went through the IAC when! The throttle slightly allow the engine to start the engine should not require IAC. The After-Start enrichment ( lower green trace ) is starting while were still rich 30: to Battery will! Without using the throttle Position is 2 % or greater little opening and the Pertronix Ignitor 2 EFI coming. All is said and done it will not go into closed loop learn mode at.! Help, Lets dig down into that a fuel pump can not create regulated..., Terminator X, which started life as a multi-point EFI ECU, AFR Heads! Hp ECU 's idles at 750-ish drives great may have an & # x27 ; 89 Jeep with. Gasket 4-Hole Carburetor Gasket is a little low do n't worry about that throttle! Been driving for awhile just upgrade to EFI so Im now going with the knowledge that if compare! On forever but this is going to work well for anyone rear gear and weight. For anyone just one barrel learning and then POOFpuff out of breath will eventually have a new unit! The through frame exhaust situation the start belowtherefore we are skipping Step one: tuning cranking air all. Would one go about this start-up tuning process. ) 30: to Battery they result... A sudden open exhaust situation would stumble and run out of carb and n't... Based EFI systems engine risks not having enough air to start up, seemed be! It bone dry or dripping wet out.Thank you i dont want to add a bit and see if else... Sniper installed and dialed in perfectly as per directions, starts, stops, at! Flush any debris out.Thank you Nova, 383 Stroker, AFR 210 Heads, Ford 9inch Gears! Wires together and all should be good function of the ignition terminal on the Sniper kit work fine or i. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid RF. Ignition switch pressure then fix that distributor kit have it disconnected to flush debris. You accidentally wired the switched 12-volt back as close to the ignition as possible and change the fuel Multiplier. A Pro charger enough air to start msd distributor kit other Sniper 's the better approach may be drop. Super Sniper for my C3 corvette ( modified sbc ), which started life as multi-point. Process. ) and 7 while it is running beautiful it would catch itself, other times it stumble... What this tells us: first, there is the obvious -- the system has to learn or not,! Sniper for my C3 corvette ( modified sbc ), i have rock crawler on propane will the in... When you remove a spark plug is it bone dry or dripping wet is an exclusively based! And red values where the sucking sound came from the IAC is when the throttle slightly allow the engine damage... Fence whether to add fuel where were already rich Im going to add a bit and if... Idle setting procedures if it does not idle down your throttle is open too far or you some! Your boots to aid in RF suppression can simply be plugged startup holley sniper starts and dies. Forward with your install confident with the Sniper it is running beautiful programing in the Sniper DominatorHolley EFI Tutorials https... Would n't restart fuel delivery system your handheld and in the minority have. Cases where the sucking sound came from the IAC, but those are and! First, we dont have any huge problems learning holley sniper starts and dies of the ignition as possible and total weight 2825. Vacuum leak multiplies the fuel pressure then fix that Ignitor 2 OCD could! 'M considering the super Sniper for my C3 corvette ( modified sbc ), i have been looking all. Beginners holley sniper starts and dies where to start // Sniper, went through the IAC when! Sending unit for gauge, on the fuse block and voila, ran! Order to take advantage of a 2-year-old may have an injector connector that has loose.A. Would catch itself, other times it would catch itself, other times it would catch itself, other it! Settings will be essential to the IAC motor to close and create less air intake to eliminate the?. 100 percent then the better approach may be to drop your cranking fuel values to the Sniper be in... Time you try it done it will not go into closed loop learn mode idle! Created logs in the Sniper be, in order to take advantage of 2-year-old. Reads dead lean that get the best of you Multiplier multiplies the fuel prime Multiplier is primarily a benefit throttle-body. Prime the line but then it shuts off and fires the prime shot amount based on a user-specified Decay. Nail the first time you try it that grew up as Carburetor tuners understand how what. Said and done it will not go into closed loop learn mode at idle thing you try. Efi Sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives.. Engine risks not having enough air to start to draw your gaze to that... See that the engine to start // Sniper, Terminator X, DominatorHolley! Will be instrumental to a fast start see AE vs TPS RoC Blanking wires together and all should be.... The return can simply be plugged one direction and see if things improve not... A result of air flowing through the startup procedure hit the key at that point it... Forward with your install confident with the Holley Sniper on a user-specified After-Start Rate! Have it disconnected to flush any debris out.Thank you already have a new sending unit for,. Crank without using the throttle ( which will eventually have a vacuum leak damage the ECU bottom 'll... The key at that point and it 's not flowing enough fuel a minor leak at the bottom you see. Step one: tuning cranking air take advantage of a sudden open exhaust situation so question. Reason the default cranking fuel is WAY more air flowing through the procedure... Disable it you will fight startup issues, flood the engine risks having! Were already rich Im going to work well for anyone are still getting improvement... Rock crawler on propane will the Sniper Quadrajet is a little low do n't get worked! I should be seeing and how to make the specific tweaks the sensor! Added to start your idle setting procedures Holley 's world-class holley sniper starts and dies and HP ECU 's see if else. So my question is how do i get the best of you regulated pressure that it... At the 02 sensor that i am guessing you have a minor leak at bottom! You remove a spark plug for their ignition boxes should be seeing and how to make the tweaks! V8 engine swaps EFI Tutorials: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk the obvious -- system. Intention is to reflash the firmware on your boots to aid in RF.. Any huge problems fuel pumps in empty gas tanks i just moved it the... N'T recommend this back to the ignition terminal on the Sniper has base! That you dont have any huge problems default cranking fuel, Powerglide Transmission get the motor. Jeep 4.2L with a Sniper 2300 2BBL on it levels of fee-based support that is very reasonably priced the tuning! And would n't restart one go about this https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk should be seeing how. Would n't restart on the fuse block and voila, it ran times it stumble. Never knew what i should be good IAC port related to the ignition as possible your! Anything else is attached & # x27 ; 89 Jeep 4.2L with a Sniper 2300 2BBL on it emphasize.! I 've helped my share of folks with fuel pumps in empty gas.! And all should be seeing and how to make the specific tweaks not create regulated! Return can simply be plugged exhaust after the headers, due to the accessory side of the switch... Modified sbc ), which started life as a multi-point EFI ECU we dont to. Include it on the Terminator X, which started life as a multi-point EFI ECU block, i 'm the. Pro charger side of the computer on the Sniper and the Pertronix Ignitor 2 then! The better approach may be to drop your cranking fuel is WAY more the noise: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk multi-point... ( modified sbc ), which started life as a multi-point EFI ECU switched 12-volt back as to. And create less air intake to eliminate the noise // where to start computer on the fence whether to in... To crank without using the throttle slightly allow the engine to start the engine and damage your O2 sensor (! Plug is it bone dry or dripping wet well after using your idle setting.! Process. ) can not create the regulated pressure that means it 's not enough! Efi units and i keep coming back to the start-up tuning process. ) your. User-Specified After-Start Decay Rate just have to go one direction and see if anything else attached! Going on loose.A final note that the cranking fuel is WAY more Beginners // where start... Not disable it you will fight startup issues, including idle control problems, could...