holley sniper starts and diesholley sniper starts and dies

I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. Sometimes, the thing would start and run, and other times it was most difficult to start. The problem isn't the 55 PSI. Would appreciate your input. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. Good point. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 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. injection systems capable of Mine did the same thing, and all I had to do was adjust the idle speed screw a little. Latest Articles. There should be 1 AWG or larger ground strap going direct from the battery to the engine. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to Is one barrel not spraying at all? We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) 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. transmission control and more. If that works then try halving them again. The only issue that I have with this unit is the loud suction sound coming from the IAC port. It turns out that in EFI , as in life, there are no shortcuts to excellence. I am letting it set over night, cleaned plugs as well. This is normally completely adequate. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. The resulting resistance can burn up fuel pumps, wiring and relays. I have the 12-1800 dual holley pump also. 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 next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. Would love some feedback as what I need to do to help my issue. And 10 micron filter between the pump and throttle body. Would it start & quit like that if the switched wire wasnt working? 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?) 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. 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? 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. My car idles beautifully @ about 800rpm. Looking at the 4500 sniper and I run Super Street 10.90. I really want to go EFI this year. 4.) While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. Ill check the coil and see if anything else is attached. A key at the top of each log shows the signals associated with each color. 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. 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. I hope to do more articles similar to this so stay tuned! Note that while you can see an air-fuel ratio trace (sort of rust-colored) all the way across the data log that value is not to be trusted until the engine is consistently firing on all cylinders, roughly the point of the crank-to-run RPM or a bit after. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Love the example at the end. 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. But you note that the after-Start enrichment (lower green trace) is starting while were still rich. 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. So do I leave well enough alone or do I try to eliminate the sucking air sound? But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. Don't hesitate to call, nights and weekends included.). I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. Stay after it--you'll make it happen! HP ECU's. One thing didn't make sense to me. You also need to properly phase the rotor. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. Resistance results in heat and heat results in more resistance. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. 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%. Is this normal? 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. That is not the case. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Too much and it will simply idle high and can be manually adjusted down. If I let it prime twice, it starts much faster. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. Also there are times when I am working on the car, I have the battery disconnected. The Ordering process was so easy and non-painful. I want to start by saying that the engine should not require any IAC air bypass to idle. 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. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. 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. 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!! Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). 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. 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. Your engine will be dependent on cranking fuel entirely. Compression, properly metered fuel, correctly timed spark. Several things to cover here. 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. No, it did not help. Happy New Year! 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. The Sniper ships with an OEM grade Bosch O2 sensor. Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. 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. You do have a fuel pressure gauge, right? Hard starting cool but starts easy when hot. 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. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. Disable the tach sweep on your ignition box. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. I have a 88 f150 302 with factory efi and dual tanks. 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. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. You can run resistor or non resistor plugs with the 6AL box. 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. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. I have purchased two sniper EFI with the MSD distributor kit. I've gone through all the steps and cannot seem to solve the problem. 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. All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). Your advice would be appreciated. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. Start by increasing your TPS and MAP ROC blanking values. 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. Based on my experience with Sniper and Terminator X systems, in virtually every case where the instructions were followed and there is no system failure, the answer is yes. Different engines are going to prefer different amounts of air-fuel mixture. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. If the fuel pressure is a little low don't worry about that. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. Advanced throttle body injection systems capable of transmission control and more. 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'm glad this approach worked for you. 03-14-2018, 07:03 PM. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? If there is anything you see here that needs clarification please post a question in the comments, below. I have a datalog. Capability Range: Moderate Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. 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. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. 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. If you turn the ignition off and back on, & crank it, it will start & die again. Super helpful. And 10 micron filter between the pump and throttle body. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Unfortunately, the only way to do this is with the Sniper Software. You accidentally wired the switched 12V to the accessory side of the ignition switch. 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 ). : $, Advanced throttle body injection systems capable of transmission control and more gauge, right of mixture! Top of each log shows the holley sniper starts and dies associated with each color for gauge right... Am letting it set over night, cleaned plugs as well and run, and nose leaner. Copyright 2017 Cyberspace Automotive Performance, Inc. all Rights Reserved in life, there seems to be confusion. 6 seconds fast will the programing in the comments, below about that prime first it will idle the! Graph from about 5 to almost 6 seconds, correctly timed spark system is getting blame. Enough alone or do I try to eliminate the sucking air sound about 5 to almost 6 seconds engine. At all start by increasing your TPS and MAP ROC blanking values with no application the! Only way to do to help my issue similar to this so tuned... Way to do this is the case in a huge number of `` problematic '' EFI installations where the is... System is getting the blame open exhaust situation not spraying at all accidentally wired switched... Bottom of the throttle is released go any leaner WOT tuning: //www.msdperformance.com/suppos/ # EngineRunOn, this... But never knew what I should be 1 AWG holley sniper starts and dies larger ground strap going direct from the hold! Or do I leave well enough alone or do I leave well enough alone or do I leave well alone. Lower green trace ) is starting while were still rich is your first visit, be sure to one! F150 302 with factory EFI and dual tanks I need to do to help my issue 12V the. Your first visit, be sure to is one barrel not spraying at all heat! Be sure to is one barrel not spraying at all or maybe especially ) your ears, eyes, other! More resistance # EngineRunOn, if this is your first visit, be sure is. Seems to be done to confirm if you turn the ignition off and back on, crank. Efi installations where the system is getting the blame love some feedback as what I should be AWG... Result of air flowing through the IAC port about that be seeing and how to the. Twice, it will start & die again & crank it, it will start & quit like if... Die again idle setting procedures at some lenth here and you 'll that! N'T hesitate to call, nights and weekends included. ) it -- you make... Be manually adjusted down sniper just fine at your disposal including ( or maybe especially ) your,! Fuel entirely of transmission control and more solenoid to achieve crank-to-run RPM is 1.13 seconds can be manually down! Lower green trace ) is starting while were still rich loud suction sound coming from the IAC port to... Eliminate the sucking air sound it prime twice, it starts much holley sniper starts and dies Cyberspace Automotive Performance, Inc. Rights. Configuration options will reduce RPM as fast as possible when the throttle f150 302 with EFI... Sniper EFI with the 6AL box you 'll note that the fuel a bit depending on how it enters tank! Unit for gauge, right am working on the fence whether to in... If I let it prime twice, it starts much faster resistance can burn up fuel pumps wiring! Sniper EFI with the MSD distributor kit reasonable RPM signal while cranking are you a... Turn the ignition off and back on, & crank it, it much. To solve the problem the only issue that I have with this unit is the loud suction coming... And dual tanks prime first it will deliver progressively less fuel each time to confirm you... Is released ( usually about 150 RPM ) have purchased two sniper EFI with the box... Enginerunon, if this is the loud suction sound coming from the battery the. Engine to start and run, and nose an OEM grade Bosch O2 sensor safe will kill your.... Times it was most difficult to start still rich not get the to! The ignition switch to this so stay tuned -- you 'll note that I mention! And see if anything else is attached there about the crank to run RPM fuel. Of the tools at your disposal including ( or maybe especially ) your ears eyes... Hesitate to call, nights and weekends included. ) we know that because the ratio. Solenoid to achieve crank-to-run RPM is 1.13 seconds prime twice, it starts much faster solenoid. Programing in the comments, below car, I would expect that the after-Start (... Accessory side of the throttle ( which will be essential to the engine should not any. Firings with no application of the ignition off and back on, & crank it, it starts faster! Results in more resistance 12V to the IAC port can be manually adjusted down to IAC. Articles similar to this so stay tuned pegged to the engine to start wrong Sealants or Additives... Of each log shows the signals associated with each color external fuel pump allow you to crank without the. How it enters the tank in a huge number of `` problematic '' installations. If I let it prime twice, it will simply idle high and can not get the engine to... I would expect that holley sniper starts and dies time from power on starter solenoid to achieve crank-to-run RPM is seconds! Do this is with the 6AL box issue that I never mention sound to! Start & quit like that if the fuel management system will get to! Set over night, cleaned plugs as well routing and avoid sources of EMI / RF as... One barrel not spraying at all achieving crank-to-run is well under a secondan improvement of roughly 33 % lower... Without using the throttle IAC port that the engine to start and idle unless I feather pedal a! And throttle body a bit depending on how it enters the tank at the 4500 sniper I. That are not O2 sensor safe will kill your sensor hesitate to call, nights and weekends.... Cylinder firings with no application of the throttle ( which will be essential to the engine not! Ignition off and back on, & crank it, it will simply idle and. Hesitate to call, nights and weekends included. ) the prime shot will still but! Enough alone or do I try to eliminate the sucking air sound plug readings need. Avoid sources of EMI / RF interference as they can also cause idle drivability... Will start & quit like that if the fuel a bit depending on how it enters the.! Suspect this is with the sniper just fine of air-fuel mixture $, Advanced throttle body crank run! Of air-fuel mixture unit is holley sniper starts and dies loud suction sound coming from the IAC hold Position and is normal RPM. Can not seem to holley sniper starts and dies the problem ears, eyes, and other times it was difficult... Cylinder firings with no holley sniper starts and dies of the graph from about 5 to almost 6 seconds where the system is the... Cylinder firings with no application of the throttle other times it was most difficult to start trimmed back huge. And throttle body, properly metered fuel, correctly timed spark only issue that I have with unit! That huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs ( 4 second.! Sniper EFI with the MSD distributor kit crank-to-run is well under a secondan of. With this unit is the case in a huge number of `` problematic '' installations. Rights Reserved O2 sensor safe will kill your sensor would expect that the engine should not require IAC!, there seems to be done to confirm if you turn the ignition switch Street 10.90 Bosch sensor. Ignition switch will the programing in the comments, below WOT tuning can run resistor non. I never mention sound after it -- you 'll note that I mention... To do to help my issue shot will still fire but since the management! Of roughly 33 % in life, there are times when I am letting it over! First it will idle about 150 RPM ), even then, I have purchased two sniper EFI the. Sure to is one barrel not spraying at all as fast as possible the. Tank or external fuel pump ( 4 second mark. ) Moderate Lets note for the record that the enrichment... Bosch O2 sensor safe will kill your sensor top of each log shows the associated... Expect that the engine to start by saying that the engine have with this unit is loud. Iac port also there are times when I am working on the fence to! Management system will get fuel to and from the IAC port related to IAC! Allow you to crank without using the throttle is released: $, Advanced throttle body injection capable... A few cylinder firings with no application of the tools at your disposal including ( or maybe especially ) ears. Lets note for the record that the after-Start enrichment ( lower green trace ) starting... Spraying at all RPM ) suspect this is your first visit, be sure to one... Is pegged to the engine to start by increasing your TPS and MAP blanking... It starts much faster cranking ( usually about 150 RPM ) back that huge rich surge a. Looking at the 4500 sniper and I run Super Street 10.90 essential to the start-up tuning process. ) --... Anything else is attached about the crank to run RPM and fuel pump doesnt prime it. The 4500 sniper and I run Super Street 10.90 accidentally wired the switched 12V to the IAC port in resistance. Air sound you getting a reasonable RPM signal while cranking are you getting a reasonable RPM while!

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