Just fired up my car with the ProFlo4 on it. At idle it pops out the exhaust. Add any throttle and it goes away. Only at idle? Any ideas? LSX454
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Backfire at idle
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Originally posted by CorkyE View PostNot an expert,but the battery at 11.8 is concerning.Last edited by Claykennedy; 08-28-2020, 08:00 PM.
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Not an expert either but I would expect to see more than 10* timing advance at 1100 rpm. Try raising the advance to the 15-20* neighborhood and see what happens. Do this before trying to get the IAC down in the 5-15% zone. Test the battery voltage with a good multimeter to verify voltage.
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If I have the idle spark advance set at 17 at 1200 rpms should it be at 17 at 900 rpms mine shows 5?Last edited by Claykennedy; 08-31-2020, 07:53 PM.
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