MMAFIGHTER121
Dedicated LVC Member
Alrite - this post got lost during a server crash from earlier but let me try again --
I'm getting p0420 and p0430. My Short term fuel is really negative and my long term fuel is really positive. All 4 O2 sensors are relatively new. All 4 were replaced at about the same time a few months ago but one of the downstream were for the wrong vehicle it seemed. The car was driven a little over a month with the wrong O2, but then while underneath I noticed the problem, So both downstream got replaced. I quickly tested the MAF a month or so ago and the voltage did increase with revs.. but thats all I checked on it. I would think any exhaust leaks large enough to cause the errors would be audible, but I couldn't find any underneath. There aren't any intake or vacuum leaks. Generally a bad Cat wouldn't affect Fuel Trims so I don't think the cats are bad. (they're only 4 months old thunderbolts). I'm leaning towards the MAF even though its voltage seemed in range.. any ideas?
I'm getting p0420 and p0430. My Short term fuel is really negative and my long term fuel is really positive. All 4 O2 sensors are relatively new. All 4 were replaced at about the same time a few months ago but one of the downstream were for the wrong vehicle it seemed. The car was driven a little over a month with the wrong O2, but then while underneath I noticed the problem, So both downstream got replaced. I quickly tested the MAF a month or so ago and the voltage did increase with revs.. but thats all I checked on it. I would think any exhaust leaks large enough to cause the errors would be audible, but I couldn't find any underneath. There aren't any intake or vacuum leaks. Generally a bad Cat wouldn't affect Fuel Trims so I don't think the cats are bad. (they're only 4 months old thunderbolts). I'm leaning towards the MAF even though its voltage seemed in range.. any ideas?