Backfires at Cold Start-ups
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Joined: Dec 2004
Posts: 83
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From: Irvine CA.
Backfires at Cold Start-ups
My car backfires when I start it in the morning. I have a supercharger and my A/F ratio is 11.5;1, so I know the backfiring is from too much fuel at start up.
Is there something that can be changed in the tuning to eliminate this problem at start up, but without effecting my A/F with warm starts, cruz, and WOT?
Other than cold starts, the car runs great!
Thanks,
James
Is there something that can be changed in the tuning to eliminate this problem at start up, but without effecting my A/F with warm starts, cruz, and WOT?
Other than cold starts, the car runs great!
Thanks,
James
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Have you done non-WOT tuning? Mine ran super rich at idle, popped on cold startups until it went into closed loop. I installed a wide band O2 and tuned it myself driving around town. I also noticed on mine that I ran really rich and my LTFT's would be down in the -16 range when 0 is perfect. It is now tuned to where my LTFT (Long Term Fuel Trim) is between 0 and negative 1 at almost all throttle conditions (except for PE mode where it goes into the set PE program).
Sounds like you need some around town driving tuning done.
Sounds like you need some around town driving tuning done.
