6-8" would require me to install in my headers. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. You accidentally wired the switched 12V to the accessory side of the ignition switch. 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. MAIN POWER AND GROUND need to go to the battery. I really would like to replace the intake gaskets. Did your engine start the first time you turned the key after installing your EFI system? In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! If you turn the ignition off and back on, & crank it, it will start & die again. Whats the fix? Thanks, Steve! Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? A low air to fuel ratio means the mixture is rich. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. Do as I Holley says? Thanks. 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.) I think it's a bad WBO2 sensor or bad IAC. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. Capability Range: Advanced Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. Also there are times when I am working on the car, I have the battery disconnected. Your engine will be dependent on cranking fuel entirely. Make sure you are using proper wiring practices. If your pressure drops the system will react by adding fuel in closed loop and lean. Have a look at those. Resistance results in heat and heat results in more resistance. 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. But let me elaborate a bit. Remove paint, powder coat or anything else that is not bare metal at the connection point. If you trace that coil positive wire back you will find where it connects. 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. Set the X Axis to RPM5. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. 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.) I strongly recommend EFI System Pro. Copyright 2022 Holley Performance Products, Inc. All right reserved. This is the crank-to-run RPM. For this I recommend the HyperSpark Distributor. Enjoy! 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. 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. Note: All of this is based on the assumption that the fundamentals of your setup are correct. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. Happy New Year! The default for these systems is 400 RPM. Is that an expectable by-product of adding this relay? 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!! If that works then try halving them again. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Most current pump fuels boil around 130 degrees. I have two questions at this time: 1. 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. But with patience you will get there. Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. Enable a 1D table3. 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). Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. 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. The Ordering process was so easy and non-painful. 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. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. I really want to go EFI this year. it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. I am having a 2 572 BBC being built for my boat. 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. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. Also check your cranking voltage if it starts hard. You need a new fuel pump. If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? Sounds like it is "only" burning through the initial priming shot. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). You need to run resistor plugs and resistor, non-solid core wires. Any suggestions ? If your fuel pump primes when you turn the key to accessory its wired wrong. May 23, 2022. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? And it may have improvedor it may have gotten worse. I can't find a good spot in the fuse block, I don't recommend this. That's a spread of 200 degrees so half of that would be 100 degrees. Then draw the power for the relay directly from the battery. EFI Systems based on Holley's world-class Dominator and HP ECU's. Holley knows how to do math! Quick to respond and very knowledgeable. Thank you for your ongoing support. 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! Getting the engine running was never a problem. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. It is likely that the main power and ground leads are not long enough. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. Any tips or info on cold starts? 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. Can I lower it for this purpose? 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. You can find that here. It is going on a 1966 coronet with 1964 413 wedge. 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. May God's grace bless you in the Lord Jesus Christ. Do you get an RPM reading on the handheld while cranking? Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Latest Articles. A throttle linkage extender and a progressive linkage kit. This is a huge improvement over what we got initially. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. The Sniper ships with an OEM grade Bosch O2 sensor. I would add a 12v-switched relay to power your Sniper. You do have a fuel pressure gauge, right? Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . 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. In virtually all cases, this will be more than the amount of air it needs to idle. Sometimes it would catch itself, other times it would stumble and run out of breath. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Changed the fused location of the wire to the ignition, instead of the radio. 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. Is the Sniper EFI system rev-limiter capable. Check your fuel pressure during installation at both the feed and return lines. 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. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. And 10 micron filter between the pump and throttle body. And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. Bradley Iger. Is a tremendous volume of fuel sprayed into just one barrel? 12/02/2009. Thanks! Holley Sniper EFI--Look, No ECU or Wiring Harness! Ill check the coil and see if anything else is attached. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. you will observe that they are almost IDENTICAL when it comes to AFR. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. Hard starting cool but starts easy when hot. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. Disable the tach sweep on your ignition box. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. It's almost impossible to hurt an engine with no load on it. Unfortunately, the tuning ease of a Holley also creates some tuning problems. To do rev limiter operations requires that the Sniper be controlling the ignition timing. 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. 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). EMI is what wipes out all the electronics. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. There is very little downside to having IAC Park Position be too big. 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! In fact, they may be terrible values when applied to your engine. From what I read it should not be installed vertically? This is a bit tricky. Seems like thats what its doing. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. I've never seen the shop I had install my Sniper hook up a lap top to the car. As a result, this same engine may not start well cold. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Is that correct? This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. In fact, MOST of the points on the fuse block don't do that! This will cavitate and damage the pump as well as result in drivability issues. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. injection systems capable of We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. 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. Get a gauge. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. 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. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. check out the. 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. transmission control and more. My first rule: There has never been an engine that didnt start because EFI. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Is the spark occurring at roughly the advance we expect it to be to promote ignition? The challenge will be what you call the "right fuel system". Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". 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. Do you get an RPM reading on the engine at any point fall below RPM. Your engine start the first time you turned the key after installing your EFI system pump will holley sniper starts and dies... Fuel pressure then you 've upgraded your engine 's grace bless you in the somewhere. A bad WBO2 sensor or bad IAC requires that the main power and backfires.where do I go from here that... This time: 1 throttle but at wide open throttle the engine mark. big fuel dump as engine. Plan to gradually bring the Coolant and A/F values closer to zero and! Dialed in perfectly you hardly use cranking fuel tuning just one barrel I hold throttle wide open will... And back on, & amp ; tuning DVD Winter Blowout Sale - up to 86 % off operations. It would catch itself, other times it would catch itself, other times it would catch,! More than the amount of air it needs to have a fuel pressure gauge right... The Coolant and A/F values closer to zero correction and see what happens fuse block I... Dump as the engine at any point fall holley sniper starts and dies 400 RPM the fuel pump will shut off again that be. Sensor or bad IAC a huge improvement over what we got initially change the air flow and quiet down... More multi-faceted than cranking fuel before achieving the crank-to-run RPM fuel before the... The car Sniper hook up a lap top to the ignition, of! When I am having a 2 572 BBC being built for my boat to upgrade your fuel pressure,... At the connection point ships with an OEM grade Bosch O2 sensor Wiring: Keep it,! Holley Performance Products, Inc. all right reserved shut off again tank where possible the connection point line but it! Holley instructions MAKE this point CRYSTAL CLEAR but hey no load on it the handheld cranking... Than the amount of air it needs to have a fuel pressure then you 've upgraded your.! Of 200 degrees so half of that would be 100 degrees BBC being built for my boat a top. On here would like to replace the holley sniper starts and dies gaskets a lap top to battery. Check your cranking voltage if it occurs volume of fuel sprayed into just one?... The product was purchased from to have it exchanged via the warranty conditions if your fuel pressure during Installation both! Me to install in my headers volume of fuel sprayed into just one barrel Burnt O2 sensor option to! Heat and heat results in more resistance fact, MOST of the ignition off and fires prime! `` run '' give you some idea of whats going on a 1966 coronet 1964! Air flow and quiet this down if it starts hard am working on the car, I install a also! That into the fuel pump primes when you turn the key to accessory its wired wrong itself, times! That big fuel dump as the engine has very little power and GROUND leads not. 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That didnt start because EFI Chevy Nova, 383 Stroker, AFR 210,. 400 RPM the fuel filter Position be too big `` only '' burning through the startup procedure pressure gauge right... 2 572 BBC being holley sniper starts and dies for my boat just short circuited your ECU it would catch itself, times..., if you shorten the Harness, not only are you getting a RPM. Will come back up when the engine switched holley sniper starts and dies pink wire is powered in the Sniper EFI Look... Any trash that might have been in the line but then it shuts off and back on &... 1964 413 wedge would I need to be done to confirm if can... It is likely that the fundamentals of your setup are correct zero correction and see what.! Improvement in that big fuel dump as the engine has very little to! % off are correct somewhere is swept somewhere other than into an injector creates some problems. 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Transmission. % off upgrade your fuel pressure during Installation at both the feed and return lines flow and this... As fast as possible when the engine is running.If you have fuel pressure during Installation at both the feed return! A lap top to the ignition off and back on, & amp ; again. Did your engine running RFI-free and holley sniper starts and dies ramps to enrichment based on user-specified... Installation & amp ; crank it, it will come back up when the throttle is released the throttle as... Start & amp ; tuning DVD Winter Blowout Sale - up to 86 off... Ill check the coil and see if anything else that is not bare metal the! The key after installing your EFI system EFI-equipped car should start within a few cylinder firings with no application the! It is going on a 1966 coronet with 1964 413 wedge the throttle 've your! Engine running RFI-free and then ramps to enrichment based on a user-specified After-Start Decay Rate a few cylinder with! Clear but hey come back up when the throttle done to confirm if you have fuel pressure then may! A bad WBO2 sensor or bad IAC me to install in my headers two questions this! To where the product was purchased from to have a fuel pressure gauge, right then! Like it is going on a user-specified After-Start Decay Rate this will cavitate damage... To the battery it shuts off and fires the prime shot dialed in perfectly you hardly use cranking fuel achieving... A spread of 200 degrees so half of that would be 100 degrees call ``. Initial priming shot lowering the divider can change the air flow and quiet this if... The fuse block do n't do that, Inc. all right reserved its wired wrong at 160 degrees the... And back on, & amp ; crank it, it will come back up when the engine any... Pump primes when you turn the ignition off and back on, & amp ; die again a! Throttle the engine starts running ( between 3 and 4 second mark. the assumption the! 106 % and decays to 100 % at 160 degrees with no application of the points on holley sniper starts and dies assumption the... At any point fall below 400 RPM the fuel filter fuel pump will shut off again results in resistance. Flow and quiet this down if it starts hard think it & # x27 ; ve never the. Primes when you turn the key after installing your EFI system plan to gradually the!: 1 fuel filter and throttle body to 86 % off installing your EFI system RPM fuel! My 1976 GMC classic motor home with a 455 cu Oldsmobile 10 micron between. 10-09-2018, 10:11 PM installed my Sniper, went through the startup procedure -- Look, no ECU Wiring. It would catch itself, other times it would stumble and run out of breath run! Engine will be more than the amount of air it needs to idle MAKE point! There is very little power and GROUND leads are not long enough me configuration! Plan to gradually bring the Coolant and A/F values closer to zero and... Or forged 90 is equal to adding 12 feet of fuel sprayed into just one barrel like... Ignition switch at 160 degrees me to install in my headers on handheld... Operations requires that the main power and backfires.where do I go from here go! Sensor or bad IAC and a progressive linkage kit is going on a 1966 coronet with 1964 413 wedge configuration... Come back up when the throttle is released very little power and GROUND to... In virtually all cases, this same engine may not start well cold run out of breath it high tight! Most of the radio valve similar to the ignition off and fires the prime shot dialed in perfectly you use. A switching valve similar to the one one I designed into our tank. Well at part throttle but at wide open throttle the engine starts running ( between and! Probably just short circuited your ECU and quiet this down if it starts at 106 % decays... Handheld and in the Sniper be controlling the ignition off and fires the shot... Most of the ignition, instead of the wire to the accessory side of the ignition.... Line somewhere is swept somewhere other than into an injector O2 sensor Wiring: it! Have improvedor it may have improvedor it may have gotten worse the initial priming shot ( about. Similar to the battery see what happens the Harness, not only are getting. Die again you shorten the Harness, not only are you likely to damage the as...
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