I made a post earlier this week, but had no replies and the problem seems to be getting worse . My car has been running extremely rich, especially in the first minute or two after the car is started, and it just sits there backfiring and popping very loud, running very rough for a few minutes, and then it gets a little better when i start to drive it, but is still running a lot richer than normal according to my air/fuel gauge. I will have my scanmaster back in next week, so i can take a look at the o2's with that then. My only thought is possible bad o2's? Any other ideas as to what could make the car run rich like that???
Thanks
Brandon

 

Something like an exhaust leak before the O2 sensor letting air to the O2 sensor therefore telling the pcm to add fuel. Another possibility could be a fuel injector stuck open.

 

Could be your o2s. BUt get them scanned first before you change them.

Do you have trbl with it hesistating any? And then it clears up after a certain RPM? That is how my car was acting. MY BLMS where at 108. and the o2 mvbarely moved. They moved from abourd 350-550 mv.

New o2s fixed the trbl, but now if I scan my car my O2s only move from 200-590 mv idling, but my BLMs are 111/112 and the car still runs good. ??

Best thing is to get it scanned and go from there. Good luck with it.

Jason