Sniper EFI Popping? - Chevelle Tech
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post #1 of 7 (permalink) Old Jan 15th, 18, 3:31 PM Thread Starter
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Dustin
 
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Sniper EFI Popping?

Alright I just finished up my install of my Sniper EFI system and did the initial setup and initial drive and first of all I love this thing I am so glad I ditched the Eddy Carb and went to this!

However I have a question.... During initial throttle input (like leaving the line or going to accelerate) I get a popping out of the exhaust but it goes away after a few seconds and also during cruise I get like a burping (popping but not as bad) is this timing related, ignition related, or Sniper related? If it's possibly Sniper related I have no problem running it for a while and seeing if it solves it I just don't want to hurt the motor (I can't remember what the AFR was when I am hearing this stuff) I don't know if my carb did this or not as that thing never ran right but I don't seem to remember anything like this. Timing is an MSD distributor with a vac advance setup and the quick advance springs and weight.

Also my PWM is running like 2.6 but it is always yellow I called Holley and they said that seemed like a decent value and you can adjust the threshold but I wanted to see what other people with the system thought.

One more thing I have 2 CTS 1 for the Holley (on top of the intake) and 1 for my Dakota Digital Gauges (on drivers side of the block) these 2 read a decent different temp but I'm not sure which one to believe. Is 1 location better than the other or should I just shoot the upper rad hose with an IR thermometer?

These might all be simple stupid questions and I apologize if they are but I'm trying to learn.

On a side note when you install a sniper system be sure the O2 sensor wires are well secured such that they don't touch the exhaust (you can ask me how I know this)......

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post #2 of 7 (permalink) Old Jan 15th, 18, 9:42 PM
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Jeff
 
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Re: Sniper EFI Popping?

some of the temp sensors do not work correctly that come in the kit. You can get a replacement local. as for the poping not sure what that is I know my sniper does not do that.

78 Malibu, 402, eddy rpm performer heads, 174 B&M blower, th350 2600 stall, holley sniper EFI, 9" 3:70, Hoosier 26X8.50-15 slicks.
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post #3 of 7 (permalink) Old Jan 16th, 18, 2:11 AM
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Justin
 
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Could be a number of things. Maybe timing too retarded. Or valves not adjusted properly

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #4 of 7 (permalink) Old Jan 16th, 18, 2:30 AM
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Chris
 
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Re: Sniper EFI Popping?

could be a fuel issue. These self learn kits have the ability to data log, log the data as it can be very helpful in these situations.

1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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post #5 of 7 (permalink) Old Jan 16th, 18, 7:06 AM
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Re: Sniper EFI Popping?

Would love to see a pic of your setup.
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post #6 of 7 (permalink) Old Jan 16th, 18, 12:01 PM Thread Starter
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Dustin
 
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Re: Sniper EFI Popping?

Quote:
Originally Posted by AldoNova67 View Post
Would love to see a pic of your setup.
Not terribly much to see

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1955 Ford Thunderbird
1969 Triumph TR6
1972 Chevelle - 396, 4 Speed
1992 Acura Integra
2002 Yamaha R1
2004 Dodge Ram 1500
2012 Dodge Durango Citadel
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post #7 of 7 (permalink) Old Feb 23rd, 18, 11:07 PM
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Re: Sniper EFI Popping?

Thanks...Iíve been intrigued by the possiblities of fuel injection.... Maybe just getting bored of carbs...lol
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