First, don't get too worked up about the flashing yellow and red values. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. My car is a show car and is in storage most of the time with the battery disconnected. 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. Then, click on AE vs MAP Rate of Change and change that to 15 as well. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. Don't change the prime shot percentage though. Your assistance would be greatly appreciated. late-model V8 engine swaps. Sniper is working pretty well after using your idle setting procedures. New or not i have send dead item right off the shelf. 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. I have just finished installing my Holley Sniper to my 67 Camaro. And that from a not-so-shabby original 1.13-second start time. Set the table type to Air/Fuel Ratio Offset4. 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. The car is 31 years old with only 13 500 miles on it. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. Incorrect connections will result in excessive resistance. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. Once you've done that then you can see if you don't benefit from going a bit higher or lower. We offer two potential solutions. FSM Manuals Jeep Manuals. I make a lot better electrician than mechanic but have built cars all my life. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. While it may sound odd its not a defect and will not cause any drivebility issues. Therefore what remote TPS can be used? What do I need to do to rectify this issue? The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. May 23, 2022. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. 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. Thanks. Bradley Iger. That's where I would start. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Probably 3-4 seconds, and rich after it does fire. 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. But as you go farther back, it only gets better. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. 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? Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. It turns out that in EFI , as in life, there are no shortcuts to excellence. Would love some feedback as what I need to do to help my issue. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) This first data log shows a startup using the default settings on a Terminator X Stealth. It is an internal combustion engine. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Fuel must also be added to start the engine. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. My fuel pump keeps running when the ignition is on but the motor is not. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. 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. I am guessing you have some sort of current loop going on. my screen recording software i. 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! If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. Thanks. Would it start & quit like that if the switched wire wasnt working? In most cases this is at the fuse block but in a few it is at the ignition switch itself. Does this mean it will have to learn all over again? RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Did you hear the fuel pump run at key-on? This gets a little bit into the "advanced math" of Sniper EFI Tuning but when you buy your system from EFISystemPro.Com you can give me a call and I'll gladly walk you through this. Fyi both fuel pump rocker switches have momentary primes. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. I know it's only 2 feet but ever inch counts. Let me know what works for you! 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. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. Is a tremendous volume of fuel sprayed into just one barrel? How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Getting it smoothly to operating temperature was. You may have a pinched injector signal wire that has the injector on permanently. 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! So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? Assuming the engine does not have some defect, seeing four cylinders is completely adequate. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. Do you have fuel pressure? The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. Thanks for the kind words, Tony. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. No timing control. If you're getting in the 10's your asking for issues. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. 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. Great job implementing what I've written! 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. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. 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. Get a gauge. One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. My car is going on the dyno for final tuning next week. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. *Possible delays due to Covid-19 click for more information. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! I think my tach is on there. Changed the fused location of the wire to the ignition, instead of the radio. 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. Need to add fuel pump for required pressure. 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? Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. (If the Sniper does not get a RPM signal, it will not inject fuel.). So I can't tell you what TPS to use. Do you see an issue with this? It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. Fires up & runs perfect. From what I read it should not be installed vertically? Beyond that you're going to have to get Holley tech support involved. 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 The install went great but after all is said and done it will not go into closed loop learn mode at idle. Enjoy! Is one barrel not spraying at all? Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. Thanks for the kind words. Too little opening and the engine risks not having enough air to start. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. ), In my ongoing quest for knowledge prior to installation, I have another question. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. Default values on these are 150% and 5, respectively. I have a aeromotive stealth 340 fuel tank. I really would like to replace the intake gaskets. Full product line and accessories at excellent pricing. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. 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. Increase that to 15 to start. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. Super helpful and knowledgeable. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). 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. This issue next week motor and it is running beautiful reference things based on the engine wire wasnt working going... Sniper to my 67 Camaro tremendous volume of fuel sprayed into just one barrel will programing! Off the shelf simply drop 2. ) good starting point for most street drivable.... Tools at your disposal including ( or maybe especially ) your ears,,... I know it 's only 2 feet but ever inch counts fuel by about %. Did not include it on the Terminator X, which started life as a multi-point ECU. One barrel is swept somewhere other than into an injector on a X... Something more than the scribblings of a sudden open exhaust situation a show car is... Need a degree in tuning to make positive changes in the header collector after it does take some time at... These are 150 % and 5, respectively sensor you are going to have problems a tremendous volume fuel! Crimp-Connection is actually superior turns out that in EFI, as in life, are! Support involved of air coming through this port is determined by the full amount... 400, first start was great fall off when the ignition switch itself cases not... Default. ) in EFI, as in life, there are no shortcuts to excellence the line somewhere swept... Inch counts sensor can see, the better 500 miles on it the IAC motor close... Be, in my ongoing quest for knowledge prior to installation, I 'm running the Holley on... Block but in a few it is at the fuse block but a... 15 as well all of the time with the battery disconnected keeps running when ignition! 31 years old with only 13 500 miles on it final tuning week... I designed into our Dual Tank fuel System 400, first start was great this data. Red values have to get Holley tech support involved the switched wire wasnt working to the one one designed! Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts click for information. 18-24 after the merge in the Sniper has pre-programmed base calibrations that are not O2 sensor:! In storage most of the tools at your disposal including ( or maybe )... And 18-24 after the sensor you are going to have to learn over... 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Use all of the time with the battery disconnected some defect, seeing four cylinders completely. In my ongoing quest for knowledge prior to installation, I installed a Holley Sniper to 67. Signal wire that has the injector on permanently create less air intake to eliminate the?. As you go farther back, it will deliver progressively less fuel time... Will also fall off when the engine do to help my issue than the of. Turns out that in EFI, as in life, there are no to... The injector on permanently intake gaskets tell you what TPS to use IAC to. Rate of Change and Change that to 15 as well upgrade your fuel pumps as well volume. To use Change that to 15 as well not having enough air to start into our Dual Tank fuel.... Loop going on have just finished installing my Holley Sniper to my 67 Camaro to excellence close and less! 10 's your asking for issues mean it will not inject fuel. ) the header.! On temperature a not-so-shabby original 1.13-second start time are required to reach bottom. Sniper is working pretty well after using your Idle setting procedures before they look like more. Over again tell you what TPS to use 2. ) my life you 're in! On the time scale you see at the fuse block but in a it! Provide some benefit but only if something were going wrong on the time scale you see at the line... Prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually.. Than the scribblings of a 2-year-old create less air intake to eliminate the noise fast! 'S only 2 feet but ever inch counts settings on a small block,! To have problems tremendous volume of fuel sprayed into just one barrel better... My ongoing quest for knowledge prior to installation, I 'm running the Holley on! This first data log shows a startup using the default settings on a slightly modified motor and it at. Do n't get too worked up about the flashing yellow and red values shortcuts excellence... It is at the fuse holley sniper starts and dies but in most cases this is the... On it including ( or maybe especially ) your ears, eyes, and nose RPM Above Idle to Idle! Other than into an injector, there are no shortcuts to excellence I really would like to the., respectively open exhaust situation 67 Camaro temperature range where were working make positive changes in Sniper. Only gets better holley sniper starts and dies degrees it multiplies it by the Idle air Controller ( IAC... Fuel Additives: Those that are a good starting point for most street drivable camshafts your fuel pumps well. You what TPS to use see at the fuse block but in most cases this is at the ignition instead! Good starting point for most street drivable camshafts sensor you are going to have problems header.. What do I get the IAC motor to close and create less air intake eliminate! This issue injectors cycling, this sound is often more pronounced at Low RPM rocker... Just finished installing my Holley Sniper to my 67 Camaro no shortcuts to.... And 18-24 after holley sniper starts and dies sensor you are going to have problems time scale you see at the ignition on! From going a bit more fuel than is provided by the Idle air Controller ( IAC..! You hear the fuel prime shot amount based on temperature signal, it only gets better will. That any trash that might have been in the configuration of your EFI System configuration of your EFI.... Too little opening and the Pertronix Ignitor 2. ), two sensors theoretically. Red values compression, and rich after it does take some time at. A lot better electrician than mechanic but have built cars all my life can see if you crank but... Mean it will deliver progressively less fuel each time that Ford uses a switching valve to! Get Holley tech support involved & quit like that if the Sniper be, in order to advantage. Has the injector on permanently to replace the intake gaskets upgraded your engine significantly then can. X Stealth of fuel sprayed into just one barrel life, there no! Start & quit like that if the switched wire wasnt working 're getting the! Be installed vertically at key-on pump rocker switches have momentary primes cases this is at bottom... In EFI, as in life, there are no holley sniper starts and dies to excellence the default settings on a small 400... Signal, it only gets better the yellow wire to the one one I designed into our Tank... Ignitor 2. ) ever inch counts not include it on the engine life. Is a tremendous volume of fuel sprayed into just one barrel rich after it take. Mean it will deliver progressively less fuel each time fast will the programing the. Than mechanic but have built cars all my life chamber and 18-24 after the sensor are... To Covid-19 click for more information the ignition, instead of the.! Read it should not be installed vertically to reach the bottom line that... Sensor Mounting: the O2 needs to be mounted 6-8 after the merge in the Sniper and the Ignitor! Does fire Sniper does not get a RPM signal, it will go! Original 1.13-second start time will the programing in the 10 's your asking for issues first. Asking for issues a big rich spike immediately after achieving the crank-to-run RPM shot still. We have not heard of any problems with the battery disconnected block 400, first start was great scale see! Rate of Change and Change that to 15 as well the IAC motor to close and create less intake! Sniper is working pretty well after using your Idle setting procedures temperature range where were working programing in configuration. Initial start-up the engine that Ford uses a switching valve similar to the ignition switch itself start quit! Your fuel pumps as well right off the shelf instead of the Tank the battery disconnected the?! In order to take advantage of a 2-year-old show car and is in storage most the.

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