Reply to "Holley Sniper EFI install"

Bell3156Member

I’m Having issues with the sniper, it’s always backfired under sudden acceleration, i recently took it on the freeway and got the car up there in speed, it almost sounded like the valves were floating but it was certainly backfire, after that the car backfires through the car on any acceleration.

i just ordered a new O2 sensor that gets here today, verified and added/improved grounds.

checked compression in all cylinders.

i had the car tuned by a knowledgeable guy but not on a dyno. he thinks it’s a valve guide/spring issue because one cylinder was 5-10% higher than the other (also had a wet plug)

well known great engine builder said he only used top quality everything and believes it’s a tuning issue.

any thoughts or insights

10/30/247:08 AM

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