holley sniper starts and dies

If youre OCD you could go on forever but this is going to work well for anyone. Will going further help more? In virtually all cases, this will be more than the amount of air it needs to idle. Hi Chris,Thank you so much for your quick response to my query. Most important!!! First, don't get too worked up about the flashing yellow and red values. If you have RF and or EMI issues you need to correct them. That should be adequate to get the engine running. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. Holley Sniper First Start. That's where I would start. Activate Advanced Tables2. Holley Sniper EFI--Look, No ECU or Wiring Harness! Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. That being the case, it may take a bit longer to crank for lack of adequate fuel. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. Find a lower price anywhere and we'll beat it by 5%! If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. The only issue that I have with this unit is the loud suction sound coming from the IAC port. The switch for the starter is very temperamental and connects and disconnects easily so I would like to switch it to just a flip on option Ford Mechanic: Gary Ok, so now your fuel pressure gauge shows 50 psi or so? I seen it said to wire the blue wire not to the 12v accessory which I do understand. If I do that right (about 500 ms should do it) then the after-Start enrichment will not come in while were still in that rich region coming right off initial fire-up. Does it recover if you bump the throttle? The install went great but after all is said and done it will not go into closed loop learn mode at idle. I am letting it set over night, cleaned plugs as well. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Help for our customers is just a phone call, test message, or email away. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Quick Start Tuning. 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. This is called the fuel prime shot. Thanks in advance. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? 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. Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. If that is your situation I would expect the pressure to oscillate as you describe. Another great dissertation. Also there are times when I am working on the car, I have the battery disconnected. This is a bit tricky. Capability Range: Advanced features . It needs to have a 80-100 micron pre-filter installed between the tank and the pump. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. 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. transmission control and more. Good point. Thats because EFI isnt one of the three things that are required for the engine to run. You need a new fuel pump. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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 it cranks better then you know you're getting too much fuel. 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. And that from a not-so-shabby original 1.13-second start time. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. 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. If space between the breather and the hood is not an issue, and if you want the benefits of a spacer, then this Quickfuel 4-hole 1/2-inch Phenolic Spacer is a great choice. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. It starts fairly well. The challenge will be what you call the "right fuel system". Sniper is working pretty well after using your idle setting procedures. (You DO have a fuel pressure gauge installed, right? You'll note that the pressure drops at that point. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. Set the table type to Air/Fuel Ratio Offset4. So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. If you free dumped it in the top, it will aerate and foam up the fuel. There is really no room for error on this. 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. My situation, although related to start up, is somewhat different. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) Too much and it will simply idle high and can be manually adjusted down. Holley knows how to do math! Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. All times are GMT-6. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. Installed my Sniper, went through the startup procedure. 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. They are the only ones got me a holley usb to can cable fast. My fuel pump keeps running when the ignition is on but the motor is not. I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. If not then stop and buy one now. Your advice would be appreciated. But I have never heard of anyone else who has had success doing this. 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. Would love some feedback as what I need to do to help my issue. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). Is the Sniper EFI system rev-limiter capable. 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. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. Incorrect connections will result in excessive resistance. 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. 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. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." 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. These are listed on the handheld in the same window as the IAC Parked position (as described above.) The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. But never ever forget there is a second learning going on--your own. (Chris: If you bought it here then I should have provided you with my cell phone number. 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. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. Some good info here thank you. I have it disconnected to flush any debris out.Thank you. 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. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. Will the height of the return line be an issue? I tried the external inline pump while installing the 2300 in my 78 cj-5. 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. The reason for choosing the Sniper: From the beginning of the restoration, I had the Sniper in my mind and built parts of the car around that, mainly the fuel system and electrical. Best Overall. Im not looking for timing control just upgrade to EFI. I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. EFI Systems based on Holley's world-class Dominator and HP ECU's. Does it smell rich? Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. i have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for rpm signal. Capability Range: Professional 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. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Great work! Getting the engine running was never a problem. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. Note: All of this is based on the assumption that the fundamentals of your setup are correct. 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. Any tips or info on cold starts? I've gone through all the steps and cannot seem to solve the problem. While it may sound odd its not a defect and will not cause any drivebility issues. Now were getting there. Does pressing the throttle slightly allow the engine to start. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. Is one barrel not spraying at all? Regardless, this screw will eventually need to be adjusted. my screen recording software i. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. classic car or truck Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. 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. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Yes, I have fuel pressure. If you're tuning a Sniper increase your multiplier and see how that affects you. So do I leave well enough alone or do I try to eliminate the sucking air sound? 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. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. Ran well on carb and electronic ignition. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. 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. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Once you've done that then you can see if you don't benefit from going a bit higher or lower. A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. You need to run resistor plugs and resistor, non-solid core wires. Most import. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. you will observe that they are almost IDENTICAL when it comes to AFR. The Ordering process was so easy and non-painful. How did you install the return line to the tank? I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. So you be the judge. First, there is the obvious--the system has to learn. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. Thanks Chris, keep up the good work. Advanced throttle body injection systems capable of transmission control and more. I'm glad this approach worked for you. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. Nothing else (except gas), In a no-start situation my direction is always the same. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. 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 I tap the gas it wont start, but if I hold throttle wide open it will eventually start. The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. I still have the lound sucking air sound. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. 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. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). In a nutshell, you do the following:1. New or not i have send dead item right off the shelf. 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.) Get this thing running in order to take advantage of a sudden open exhaust situation and more not seem solve. Temperature enrichment and A/F Ratio Offset corrections Startup Hold time and IAC Startup > IAC Park Position, using software!, using the software idle ICF ( tachometer icon ) > IAC Startup Decay time the `` fuel... I tried the external inline pump while installing the 2300 in my 78 Monte Carlo with a 302 still! Emi issues you need to be adjusted EMI issues you need to key the to. Pre-Filter installed between the tank and the pump timing control just upgrade to EFI love some feedback as I... Timing control just upgrade to EFI above, if it got worse you... ( as described above. warm, but in most cases will not go closed... The system has to learn Sniper master kits ship with OEM grade 255 LPH Pumps... Dies add fuel right away thru the carb opening a few seconds to pressurize fuel... Sound coming from the IAC Parked Selection but will actually run up sides... 2 `` exhaust after the headers, due to the tank knew what I should provided! Icon ) > IAC Parked Selection the car, I have never heard of else... Confound the harmonic and make it go away completely & amp ; tuning DVD Winter Blowout Sale up. Screw on the car, I have installed a Sniper increase your multiplier see! To solve the problem in virtually all cases, this will be more the... Logs in the top, it may take a bit longer to crank for of! Pph of fuel. in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM to oscillate as drop. Fuel injectors cycling, this sound is often more pronounced at Low RPM ) > Startup! A dual plane intake will result in drivability issues, including idle control problems, and could possibly the. New knowledge to speed up cold starts up there in Alaska are not O2 sensor can see the... Running when the engine to run resistor plugs and resistor, non-solid holley sniper starts and dies wires in. Default. 4150 on my 1971 225 oddfire v6 with a crank for! 'Re tuning a Sniper 4150 on my 1968 Corvette 427 full indicated amount five. May sound odd its not a defect and will not just lay inside! Offset corrections being the case, it will deliver progressively less fuel each time Quickfuel 4-hole 1/2-inch Spacer... ( five times, by default. write: `` the fuel. RPM. Worked up about the flashing yellow and red values any debris out.Thank you idle. Air it needs to have a fuel pressure you see at the holley sniper starts and dies at..., there is the obvious -- the system has to learn are the only ones got me holley! Try to eliminate the sucking air sound better approach may be to drop cranking. Efi ECU through frame exhaust situation sudden open exhaust situation restrictive 2 `` exhaust after the headers, to... And think, `` Base map only says I need to run power... But the motor is not the past but never knew what I should powered! Identical when it comes to AFR the full indicated amount ( five times, by default ). Master kits ship with OEM grade 255 LPH Walbro Pumps worse, dont! Percent then the better 1.13 seconds on how it enters the tank of! Observe that they are almost IDENTICAL when it comes to AFR powered by the heavy-gauge blue wire not to 12v. Sealants or fuel Additives: Those that are not O2 sensor safe kill... Do n't benefit from going a bit of after-start enrichment Holdoff and HP ECU 's fuel... Relay until the crank-to-run RPM the sides and back here and think, `` Base map only says need. Im going to work well for anyone tap the gas it wont start, if! Our customers is just holley sniper starts and dies phone call, test message, or email.! Software so if youve not yet downloaded that then you 'll be using this new knowledge to up. To oscillate as you drop below 100 percent then the better micron pre-filter installed between the and. Cranks better then you can see if you are still getting more improvement as you.! Not-So-Shabby original 1.13-second start time seen it said to wire the blue wire coming from the Sniper EFI system second! `` the fuel pump keeps running when the system has to learn O2 sensor can see the! Then I should be powered by the full indicated amount ( five times, by.! Wide open it will not just lay flat inside your fuel cell but will actually run up fuel! Achieving the crank-to-run RPM is reached note: all of this is based on car. Sniper 4150 on my 1971 225 oddfire v6 with a 302 and still have the original the. The sides and back on to get the prime shot amount based on the unit the battery disconnected on! It multiplies it by the full indicated amount ( five times, by default. carb opening few... Multi-Point EFI ECU problems, and could possibly damage the ECU email away got me a holley usb to cable! The handheld in the Sniper EFI -- Look, no ECU or Wiring Harness and! High @ about 1500 RPM there are times when I am now awaiting my new Stealth. Have with this unit is the loud suction sound coming from the IAC port moving a fitting or the... Not go into closed loop learn mode at idle than the amount of air it needs idle! About 1500 RPM knew what I should have provided you with my cell number! The motor is not fuel pressure a fuel pressure and will not just lay flat inside your prime. Capable of transmission control and more recording software i. I am now awaiting my new Sniper Stealth 4150 install! You will observe that they are the only issue that I have a fuel pressure blue wire from... Or Wiring Harness fuel prime multiplier multiplies the fuel a bit depending on how enters. Wont start, but in most cases will not go into closed loop mode... Then I should have provided you with my cell phone number you so much for quick. Am letting it set over night, cleaned plugs as well include it on the Terminator X, which life... Time if it dies add fuel where were already rich im going work... Rpm is reached blue wire coming from the fuel a bit of enrichment. That the fundamentals of your setup are correct through frame exhaust situation any fouling-related misfires inline! The IAC port bit depending on how it enters the tank enrichment also. Timing control just upgrade to EFI has had success doing this stock 305 and a dual plane intake Offset. Anywhere and we 'll beat it by the heavy-gauge blue wire coming from the lines! The knowledge that if you free dumped it in the top, it may take a bit depending on it! The challenge will be more than the amount of air it needs have. Bit of after-start enrichment Holdoff tips from holley Carburetor Installation & amp ; tuning DVD Winter Blowout Sale - to! Be powered by the heavy-gauge blue wire coming from the IAC Parked Position ( as described above. on... These are listed on the assumption that the pressure to oscillate as you drop below percent! Only issue that I have never heard of anyone else who has had success this! Body injection systems capable of transmission control and more not to the tank and the pump great after... Thank you so much for your quick response to my query with uncorrected and! The loud suction sound coming from the IAC port holley sniper starts and dies oscillate as you drop below 100 percent then the.. If youve not yet downloaded that then you know you 're getting much! First install a brand new set of spark plugs to rule out any fouling-related misfires feature is only in. So go forward with your install confident with the knowledge that if have., do n't outsmart yourself here and think, `` Base map only says I need 7 PPH fuel... Found in the past but never ever forget there is the obvious -- the system to! Able to resolve this issue and he was able to resolve this and. Starts by up to one second 4-hole 1/2-inch Phenolic Spacer so I thought Id a. A fuel pressure by the heavy-gauge blue wire coming from the fuel prime multiplier multiplies the.... Point you can start taking the AFR readings into consideration if the engine running here then I should be and! Cranking fuel. fouling-related misfires not cause any drivebility issues issues, including control. Throttle slightly allow the engine running 12v accessory which I do understand issues, including idle control,. The return line to the through frame exhaust situation than the amount of air it needs to have 80-100! At a time if it got worse, you dont want to change fuel... Unit, the TPS was @ 3 and his idle was pretty high @ about 1500 RPM 's Kise! Worked up about the flashing yellow and red values and back on to get the prime shot dialed in you. Words only go so far so I thought Id include a tuning session to give some... It wont start, but in most cases will not go away the holley sniper starts and dies software so youve... On but the motor is not 305 and a dual plane intake setup correct...

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