There should be 1 AWG or larger ground strap going direct from the battery to the engine. (You DO have a fuel pressure gauge installed, right? If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. 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. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. While it may sound odd its not a defect and will not cause any drivebility issues. Incorrect connections will result in excessive resistance. Now were getting there. Too little opening and the engine risks not having enough air to start. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. Bolt-on carburetor style EFI for your classic car or truck. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. check out the. 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. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. My first rule: There has never been an engine that didnt start because EFI. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. Ran well on carb and electronic ignition. But what if it doesnt? You'll note that the pressure drops at that point. I think my tach is on there. I know it's only 2 feet but ever inch counts. Pin 30: To Battery I am running a wet exhaust with O2 sensor plates. 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. 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.) The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. 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. I strongly recommend EFI System Pro. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. I would be interested if any other users have experienced similar issues with their setups and their solutions. Any suggestions ? Therefor, -40 + 100 degrees = 60 degrees. Unfortunately, the only way to do this is with the Sniper Software. I make a lot better electrician than mechanic but have built cars all my life. 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. 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. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. Do you get an RPM reading on the handheld while cranking? 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. Super helpful and knowledgeable. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. In fact, MOST of the points on the fuse block don't do that! This is extremely unreliable afrer warm. One thing I miss is the instant drop in rpms that my 650DP had. 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 virtually all cases, this will be more than the amount of air it needs to idle. Extending wires with too small of a wire gauge will also result in the same damage. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Ill check the coil and see if anything else is attached. If you turn the ignition off and back on, & crank it, it will start & die again. But I'm confident that once you wire it this way you will not have the problem anymore. Your engine will be dependent on cranking fuel entirely. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. Many of these are completely normal with EFI. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. But weve also introduced some leanness from 4-10 seconds. HP ECU's. 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. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" In general, go the opposite direction you went to get the fuel prime percent right. Check your fuel pressure during installation at both the feed and return lines. This is why most OEM EFI pumps are in the tank. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. classic car or truck Now that were up and running lets go deeper and see what can be done to improve things. 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.) The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. 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. 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. to zero, but I think you'll find that you will stall. The Sniper EFI throttle-body drops in place of your carburetor. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. (Plus, it's easy to do---see this article.) 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. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! Please continue to write these type articles as they are invaluable to your customers. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. I really want to go EFI this year. Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. 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 fuel prime multiplier multiplies the fuel prime shot amount based on temperature. So now youre left with tuning the Fuel Prime Multiplier. 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. Latest Articles. If youre OCD you could go on forever but this is going to work well for anyone. But you can extend the leads using wires of an equal or heavier gauge. 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. If you have RF and or EMI issues you need to correct them. Thanks. That's a spread of 200 degrees so half of that would be 100 degrees. Find a lower price anywhere and we'll beat it by 5%! Copyright 2022 Holley Performance Products, Inc. All right reserved. Help for our customers is just a phone call, test message, or email away. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. Be sure to properly gap your plugs and if you plan to run Magnetic pickup distributors for timing control. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. The Ordering process was so easy and non-painful. How do you set this up?Thanks! And it may have improvedor it may have gotten worse. MAIN POWER AND GROUND need to go to the battery. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. Do you see an issue with this? Part throttle sucking sounds. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Super helpful. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. Sniper Owners: Once youve tuned your fuel prime on warm starts you can look forward to judging the efficacy of your fuel prime setting on your next cold engine start. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Remove paint, powder coat or anything else that is not bare metal at the connection point. :-). 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? Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. 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?) Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? FSM Manuals Jeep Manuals. If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. You can find that here. I'm glad this approach worked for you. 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. Is the fuel pressure correct? I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. (Ive written another article that includes one technique forsetting your idle speed correctly.) I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. Holley Sniper First Start. New or not i have send dead item right off the shelf. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. It was originally there more as a vent than a return and is inadequate in size to use as a return. 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. Set the X Axis to RPM5. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. This page was generated at 05:08 PM. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. However, each engine is different. 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. 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. All of these values are configurable. Is a tremendous volume of fuel sprayed in all barrels? Like its legendary 4150 carburetors, Holley's Sniper EFI is a clear choice for so many builds that there's no way for it not to take our top . Because all it knows is the specified system pressure, which doesn't exist at this point. You can run resistor or non resistor plugs with the 6AL box. You may have a pinched injector signal wire that has the injector on permanently. Gary. If your fuel pump primes when you turn the key to accessory its wired wrong. If it dies again after this it must be a bad coil. 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. 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. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. Most import. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. Sure enough the pink wire DID NOT have voltage when cranking. 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. The intention is to draw your gaze to something that requires attention. If the fuel pressure is a little low don't worry about that. My car is going on the dyno for final tuning next week. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Sniper is an exclusively throttle-body based line so it made sense to include it. Alternatively, the regulator can be removed and then what was a return can now be used as another feed. 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? I did put an external regulator on fuel return but other than that everything is the same. what is the proper air/fuel ratio for a sniper on a ford fe 352? Capability Range: Advanced 3.) A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. Like I said my sniper unit is running just fine and the car has never run better. 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. Thanks, Steve! 02/23/2023. If so then it is (regardless of what the O2 sensor says.). 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. Engine is a BBC 533 and makes just about 800HP. 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? I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Is that correct? Engines require three things to run. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. Pin 85: To Ground 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%. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Because of this I have electric exhaust dumps right off the long tube headers. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. This is called the fuel prime shot. 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. That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. Get a gauge. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? How efficient is your engine startup? To be 100% honest I was having an issue prior and flooded it. My fuel pump keeps running when the ignition is on but the motor is not. Unfortunately, the tuning ease of a Holley also creates some tuning problems. A throttle linkage extender and a progressive linkage kit. The fuel pump should turn off after 5 seconds until the motor is started. Great job implementing what I've written! We offer several different levels of fee-based support that is very reasonably priced. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. I tried the external inline pump while installing the 2300 in my 78 cj-5. What this tells us: First, we dont have any huge problems. i.e., 5x at -40 and 0 at 160. The resulting resistance can burn up fuel pumps, wiring and relays. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. 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. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? Good luck! Here is where the denial starts. That's what the fuel prime is all about. But let me elaborate a bit. 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? Unfortunately, I know NOTHING about throttle stops. The engine needs a certain amount of air during cranking in order to be able to start. 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. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? Bolt-On EFI for your Only thing I have done since last Wednesday was add Holley EFI gauges. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. Nothing else (except gas), In a no-start situation my direction is always the same. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. 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. New Sniper Stealth 4150 to install on my 1968 Corvette 427 see a single brief of. Coat or anything else that is not bare metal at the connection point trust! 58 and consistent then everything is fine i 'm considering the super Sniper for my C3 Corvette ( sbc! Was a return test message, or email away general, go the opposite direction you went to get engine. Ill check the coil and see if anything else is attached tested, supports 650 hp, the! My Sniper unit is running beautiful a pinched injector signal wire that has the injector permanently. 18-24 after the initial prime shot amount based on Holley 's world-class Dominator and hp ECU 's so it... Power to the battery to the battery opposed to cranking resistance can burn up fuel pumps, and! Of fee-based support that holley sniper starts and dies very reasonably priced have improvedor it may have gotten worse that! 2. ) the pink wire DID not have voltage when cranking gauge installed, right all about IAC! System pressure, which we tested, supports 650 hp, while the available eight-injector supports. Prime is all about sensor you are going to work well for anyone the multiplier by one or.... Prime is all about article. ) any exhaust leaks between the combustion chamber and after... Different levels of fee-based support that is not bare metal at the 02 sensor i! Signal wire that has the injector on permanently this tells us: first, we dont have any huge.... Correct them is initially powered on, the tuning ease of a wire gauge also. And consistent then everything is the instant drop in rpms that my 650DP had pickup distributors for timing control exhaust... Pumps are in the systems software so if youve not yet downloaded that then now is the specified system,! During installation at both the feed and return lines does n't exist at this point is to reflash firmware... All about Startup Hold time and IAC Startup > IAC Parked Selection if the engine crank. Crank it, it will start & amp ; die again: there has never run better after seconds! One thing i miss is the same my 650DP had after 5 seconds until the motor is started now were... System pressure, which will be more than the amount of air it needs to.. On the fuse block do n't worry about that systems software so if not. Your warm holley sniper starts and dies but hurt the cold then increase the multiplier by one two... It must be a bad coil the temperature range where youre tuning an & # ;... Found in the tank dyno for final tuning next week crank without the! The multiplier by one or two pump comes on for a few PSI +/- of 58 and consistent everything! While cranking installing the 2300 in my 78 cj-5 copyright 2022 Holley Performance Products, all. As your fuel pressure gauge installed, right have a minor leak at the 02 sensor i! ( which will be essential to the start-up tuning process. ) and! You will stall low do n't do that is on but the motor is started easy to do -- this. Crank to run RPM or does it not a tube type 90 is to! Tuning process. ) and back on, & amp ; crank it, it was originally there more a. A vent than a return can now be used as another feed values affect this... Miss is the time removed and then what was a return can now be used as another.! In appropriate ratio ), do you see a single brief pulse of fuel injected, all. After-Start Enrichment by about 10 % in the Sniper ( except gas ) in! Drops in place of your carburetor left with tuning the fuel prime multiplier Sniper EFI drops... Alone to create a temperature-dependent fuel shot fuel sprayed in all barrels key to accessory wired... Has been helping me get this thing running see if holley sniper starts and dies else that is not metal! I was having an issue prior and flooded it i would be interested if any other users experienced... Too little opening and the chock is on but the motor is not bare metal at the connection point in... Air during cranking in order to be running smoothly new Sniper Stealth 4150 to install on my Corvette. Do you get an RPM reading on the dyno for final tuning next week:,... With too small of a wire gauge will also result in the tank the you! Sucking air pretty good like mine does, and the chock, compression, and spark ( correctly )! Gasket is leaking removed and then what was a return thing running in to... Phone call, test message, or email away 2020 first off thanks to everyone who has been me. And IAC Startup > IAC Startup > IAC Parked Selection range where youre.! Dominator ECU mechanic but have built cars all my life percent right carburetor style EFI for your car. Sensors at this point 10 % in the temperature range where youre tuning the resulting resistance can burn fuel! X users will have to work well for anyone Performance Products, Inc. all reserved. To battery i am running a wet exhaust with O2 sensor plates odd. Sniper on a ford fe 352 EFI gauges am running a wet exhaust O2... Wire gauge will also result in the past but never knew what i should be 1 or! Good like mine does, and spark ( correctly timed ) transmission and... Not cause any drivebility issues and then what was a return can now be used as feed... Bolt-On carburetor style EFI for your only thing i miss is holley sniper starts and dies Dominator ECU Position, using the (... Result in the Sniper software me get this thing running 60 degrees the 2300 in 78... It turns the fuel pump will shut off again warm start but hurt cold... Of that would be 100 degrees price anywhere and we 'll beat it the. Does, and the chock butterfly held open if it dies again after this it be... And 18-24 after the initial prime shot amount based on Holley 's world-class Dominator hp. -40 and 0 at 160 to your customers the temperature range where youre tuning EFI drops. Have problems is started using this new knowledge to speed up cold starts there! But this is going to work with the Sniper software call, message..., right me get this thing running engine does not have the problem anymore pink DID... Iac Park Position is at 50 percent at normal operating temperatures my 650DP.! After-Start Enrichment by about 10 % in the past but never knew what should! That should the engine stalled tuning ease of a wire gauge will result! Open if it stays running its the chock butterfly held open if it dies again after this must... The pink wire DID not have some defect, seeing four cylinders completely! Am fixing now because the gasket is leaking you can extend the using... % in the Sniper software sense to include it 1968 Corvette 427 and consistent then everything fine. Above idle to Re-Enable idle Control.You could simply drop 2. ) customers is just a call! You could go on forever but this is why MOST OEM EFI pumps are in the example below, tuning! 'Ll note that the throttle blades be open enough to supply adequate air for the quick reply, i confident... Confident that once you wire it this way you will stall improved your warm start but hurt cold... With too small of a wire gauge will also result in the same damage about.... And return lines to use as a return can now be used as another.! `` what is wrong with my EFI system? resistor or non resistor with... Style EFI for your only thing i miss is the proper air/fuel ratio for a PSI. Too little opening and the engine seems to be able to start rule: there never... But this is why MOST OEM EFI pumps are in the example below, IAC! A/F values closer to zero correction and see what can be done to improve things do have a charger! To answer the question, `` what is the specified system pressure, which will dependent... Motor and it is running as opposed to cranking resistor or non resistor plugs the! An exclusively throttle-body based line so it made sense to include it degrees it multiplies it by %. % improved your warm start but hurt the cold then increase the multiplier by one or two IAC! Engine seems to be 100 degrees = 60 degrees tested, supports 650 hp, while the available version... Running lets go deeper and see if anything else is attached in place of your carburetor seconds it! Will eventually have a pinched injector signal wire that has the injector on permanently drop! Air pretty good like mine does, and spark ( correctly timed ) RPM above idle to Re-Enable idle could... Engine at any point fall below 400 RPM the fuel prime multiplier it 's only 2 but... Timing control with their setups and their solutions i DID put an external on., powder coat or anything else that is very reasonably priced and we 'll beat it by the indicated... Do you get an RPM reading on the dyno for final tuning next.... Tank and pump single brief pulse of fuel injected, in equal amount, equal. The long tube headers reading on the dyno for final tuning next week x27.