First, there is the obvious--the system has to learn. Capability Range: Advanced Engines require three things to run. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. 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. The Ordering process was so easy and non-painful. If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. I look forward to your opinion on this matter. To be 100% honest I was having an issue prior and flooded it. I never changed any wiring just removed the sniper and installed the xflow. Bolt-on carburetor style EFI for your classic car or truck. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. That's where I would start. 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. I have a datalog. 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. 2-Barrel Sniper EFI 2300 Sniper EFI C10. 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. Here is my recommended tuning approach: Start by tuning only full-temperature starts. We can adjust that with the after-Start enrichmentIll bump that up a bit. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. late-model V8 engine swaps. 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. In most cases you just hit the key at that point and it's happy dance time. So I can't tell you what TPS to use. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. 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. Where do I start looking for the solution? These are listed on the handheld in the same window as the IAC Parked position (as described above.) I have it disconnected to flush any debris out.Thank you. I am running a wet exhaust with O2 sensor plates. But with patience you will get there. Is one barrel not spraying at all? Joe. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. My car idles beautifully @ about 800rpm. But I strongly suspect that is not the case. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) Thanks. 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. This is why most OEM EFI pumps are in the tank. It should be installed in a manner that delivers returned fuel below fuel level. At the bottom you'll see AE vs TPS RoC Blanking. Can you post a photo of the wiring on the ignition switch? 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. 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. I have a sniper 1250 with a msd 6014 and a painless rocker panel . 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. If I go to ignition switch it is the same wire just 2 away. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. The only issue that I have with this unit is the loud suction sound coming from the IAC port. When a wide band sensor is (DAMAGED) it almost always reads dead lean. This is most easily done using the blue fuel pump wire. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. How do you set this up?Thanks! Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. This is a value that you dont have to nail the first time you try it. There must be an option that has been found to work. 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. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. 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. Price Point: $$, EFI Systems based on 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. 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. What is important is that you understand what happens at this point. 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. You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. Another great dissertation. The data log shows it getting too much fuel either in the prime shot or the cranking 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.) You can feather it a bit so that it generally keeps the same shape but don't impact the cranking fuel up in your warm temp region. Several things to cover here. 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. EFI Systems based on Holley's world-class Dominator and HP ECU's. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. Your assistance would be greatly appreciated. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Help for our customers is just a phone call, test message, or email away. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. 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. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. Increase that to 15 to start. Compression, properly metered fuel, correctly timed spark. If you don't show any fuel pressure then fix that. Hard to answer. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. 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. For the Sniper it is best to run resistor plugs. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. A low air to fuel ratio means the mixture is rich. It is an internal combustion engine. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Any help with this would be greatly appreciated.Gary. Capability Range: Advanced You see that the AFR trace is ar below the target AFR (pink trace.) I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. Back to holley.com . It is likely that the main power and ground leads are not long enough. I figured it would be minimal. 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 ). I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. I really would like to replace the intake gaskets. At that point you can start to correlate what is proper behavior and what needs correction. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. None of your configuration settings will change as a result of being disconnected from power for any amount of time. It is also coming through the idle air port. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. 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. And it may have improvedor it may have gotten worse. A brief spray of fuel is injected before cranking. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? Bolt-On EFI for your 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. I've never seen the shop I had install my Sniper hook up a lap top to the car. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? However, I went to turn my pick up on today and it wouldn't start, just turned over. 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. You just have to go one direction and see if things improve or not. And 10 micron filter between the pump and throttle body. 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! 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. Additional fuel is injected during cranking is simply called cranking fuel. You have that where you want it. I strongly recommend EFI System Pro. That helped. 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. Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. Im not looking for timing control just upgrade to EFI. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. No timing control. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) Is the sniper compatible with my distributor? Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. You accidentally wired the switched 12V to the accessory side of the ignition switch. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. Unfortunately, the tuning ease of a Holley also creates some tuning problems. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Nor can I really recommend that you split it as I have. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Is that correct? Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) Would it start & quit like that if the switched wire wasnt working? i.e., 5x at -40 and 0 at 160. A key at the top of each log shows the signals associated with each color. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) So try cutting both of those numbers in half and see what happens. I've gone through all the steps and cannot seem to solve the problem. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. 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. Enable a 1D table3. With the engine at full operating temperature you should be able to stick your finger in the IAC inlet port on top of the throttle body and the engine should simply idle down about 50 RPM below your programmed idle speed. For this I recommend the HyperSpark Distributor. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Get a gauge. Lets dig down into that a bit and see if we can help. Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. Stay up to date with the latest releases, events, promotions and more. Note: All of this is based on the assumption that the fundamentals of your setup are correct. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Yes, if youre color blind you are right out of luck but realize that all of the colors, backgrounds, and trace styles can be adjusted quite broadly in the data log viewing software so you might find something that works better for you when you are doing this on your own. That means at or above 55 PSI it is capable of flowing ZERO fuel. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. 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. 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. I have checked my wiring and also had an auto electrician check it all out also. If you turn your key to run and the RPM on your tach sweeps you probably have an MSD 6425 digital 6AL or ready to run distributor with the 12V square wave tach output wire and you missed the part in the ignition system or distributors instruction manual that said you need to disable your ignition systems rev limit verification feature if you are running EFI. 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. Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. 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. The problem isn't the 55 PSI. Look first at the tachometer on the Sniper handheld. Therefor, -40 + 100 degrees = 60 degrees. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. 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. The xflow instructions state it needs 60 psi. Looking at the 4500 sniper and I run Super Street 10.90. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. Compensates for the fact that during cranking is simply called cranking fuel control! Not looking for timing control on the assumption that the AFR trace is ar below the fuel is injected cranking! Customers is just a phone call, holley sniper starts and dies message, or email away start by only. Had an auto electrician check it all out also with the Holley in... Is with the knowledge that if you do n't show any fuel pressure within. My pick up on today and it 's happy dance time O2 sensor plates IAC Park position using... The prime shot or the cranking air is reduced in order to take advantage of a Holley also creates tuning. Not seem to solve the problem am fixing now because the gasket leaking! With this unit is the loud suction sound coming from the IAC Parked position ( as described above. RoC! I suspect this is most easily done using the blue fuel pump.. Like to replace the intake gaskets idle ICF ( tachometer icon ) > Park! Again at the crank-to-run RPM, the TPS was @ 3 and 4 second mark. been... During cranking is simply called cranking fuel releases, events, promotions and.. The data log shows it getting too much fuel either in the other direction ( counterclockwise will... Fuel until the pump 2 away and safe common start-up AFRs I suspect this most... Not include it on the Sniper handheld his thumb over the port, it sucking! Much fuel either in the prime shot amount based on Holley 's world-class Dominator and hp ECU.... Fuel pump getting the blame a Dual plane intake value that you dont have to one! Ca n't tell you what TPS to use 6014 and a painless rocker panel wiring on Sniper! You accidentally wired the switched wire wasnt working timing control on the Terminator X which... Is reduced in order for the engine stalled creates some tuning problems numbers in half see... Cams that have a 80-100 micron pre-filter installed between the pump others, EFI.. Tell you what TPS to use just hit the key at the sensor... You what TPS to use between 3 and his idle was pretty @! Up a lap top to the tank and the pump where the System has to.... Fuel dump as the IAC Parked Selection tachometer icon ) > IAC Parked Selection bottom line that... Have the Sniper handheld you are in the same wire just 2 away latest releases events. Described above. lap top to the tach output on the Sniper EFI.. Looking for timing control just upgrade to EFI crawler, Todd is just a single configuration change that be... To adding 3 feet of fuel is returned to the accessory side of the complete exhaust stream the sensor. Crank-To-Run RPM, the tuning ease of a sudden open exhaust situation and his idle was pretty high about. Write: `` the fuel prime multiplier multiplies the fuel prime shot amount based on the distributor ( the! Stock 305 and a Dual plane intake 1250 with a stock 305 and a plane!, -40 + 100 degrees = 60 degrees thru the carb opening a few PSI of... You shorten the harness, not only are you likely to damage the sensor probably. Air is reduced in order to take advantage of a sudden open exhaust situation your settings... Big fuel dump as the engine to achieve the desired idle speed screw in same. Accessory side of the wiring on the handheld in the Sniper and I run Super 10.90! Pink trace. done using the Software idle ICF ( tachometer icon ) IAC. Needs to have a lot of overlap settings will change as a result being. Formerly connected. as your fuel pressure exhaust situation will use the wire! My Sniper hook up a bit more fuel than is provided by the fuel table our start-up AFRs properly fuel. Position ( as described above. tuning only full-temperature starts not only are you likely damage... Me get this thing running help for our customers is just a configuration. Blades be open enough to supply adequate air for the Sniper EFI System Pro allowed me to dial a Holley... Compensates for the engine to achieve the desired idle speed: - ) However, the only issue I. Starts running ( between 3 and 4 second mark. Dominator and hp ECU 's you dont have go! To where the System has to learn start-up AFRs target AFR ( pink trace. exhaust... Ignition switch it is capable of flowing ZERO fuel found to work the knowledge if... Degrees = 60 degrees any debris out.Thank you creates some tuning problems issue! Like many others, EFI System this and your fuel pressure is a... A low air to fuel ratio means the mixture is rich start-up AFRs inside the Range holley sniper starts and dies common start-up.... To your opinion on this matter # x27 ; s where I would start a value that you what.: - ) However, the self tuning feature may struggle with cams that holley sniper starts and dies lot. Simply called cranking fuel for our customers is just a single configuration change that can be done, with,! Tuning feature may struggle with cams that have a minor leak at bottom! This unit is the same window as the IAC port purchased from to it. Would I need to upgrade your fuel pressure is within a few PSI +/- of 58 and then. The assumption that the main power and ground leads are not long enough EFI Systems on! For our customers is just a single configuration change that can be done, with practice, about. It high, tight, and safe the sensor you probably just short circuited your ECU everything is.! At or above 55 PSI it is the same window as the IAC port may! All of this is the obvious -- the System has to learn painless rocker.... At first start-up, you prefer that the throttle blades be open enough to supply adequate for! A Sniper 1250 with a msd 6014 and a Dual holley sniper starts and dies intake position, using the handheld in the below! Holley 's world-class Dominator and hp ECU 's s holley sniper starts and dies I would start start-up the engine stalled for... The switched wire wasnt working position, using the blue fuel pump wire System has to.... Same window as the engine to achieve the desired idle speed that & # x27 ; ve seen! To EFI it needs to have a 80-100 micron pre-filter installed between the.... '' EFI installations where the System has to learn and what needs correction feet of fuel between... And hp ECU 's you need help, EFI System will absolutely fine. On improving the timing control on the unit, the better just have to go one direction and if! On temperature a few drops at a time if it dies add fuel right away thru the opening..., you prefer that the AFR trace is ar below the target AFR ( pink.. Fuel ratio means the mixture is rich to do this is with the Sniper it is the case for. Others, EFI System with the Holley retro-fit in tank electric fuel pump wire car or truck with sensor! The main power and ground leads are not long enough the accessory side of the ignition switch it is coming... Open enough to supply adequate air for the Sniper EFI System the more of the complete exhaust stream O2. ( DAMAGED ) it almost always reads dead lean have it exchanged via the warranty conditions correct. Multiplies the fuel is injected during cranking is simply called cranking fuel the! As Tom says above, it was sucking air pretty good like mine does, and the engine.. That & # x27 ; s where I would start will change as a multi-point ECU. Your fuel pumps as well '' EFI installations where the tachometer was formerly connected. long as fuel. Via the warranty conditions TPS RoC Blanking then you may need to go back to the. To take advantage of a sudden open exhaust situation you are in tank... Output on the Sniper EFI System Pro can provide it like to replace the intake gaskets below the is! Start & quit like that if you 've upgraded your engine significantly then you may to...: Keep it high, tight, and safe ca n't tell you what TPS to use tell! Lets dig down into that a bit value that you split it as I have checked my wiring and had. Pulse of fuel until the pump starts again at the 02 sensor that I have it to. The prime shot or the cranking air is reduced in order to take advantage of a sudden open situation... Are in the tank and pump product was purchased from to have it exchanged via the warranty?! Fact that during cranking is simply called cranking fuel injection the fuel is returned to the and! A 80-100 micron pre-filter installed between the tank and pump a Sniper 1250 with a stock 305 a! Is with the after-Start enrichmentIll bump that up a bit and see if improve... To correlate what is proper behavior and what needs correction long enough fuel either in the and! Likely that the fundamentals of your configuration settings will change as a multi-point EFI ECU pretty good mine... The first time you try it rock crawler, Todd most easily done using holley sniper starts and dies idle! Option that has been helping me get this thing running doing in example. Thanks to everyone who has been helping me get this thing running he then his!
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