i came in contact with a big problem yesterday....my oil rings fryed in my turbo, so i bought a new 42 trim T3 turbo today. I popped it on and my car is running extremely weird. I did downsize from a 60 trim to a 42 trim, but would that effect the idle ARF an extreme amount?? because its now holding solid at around 16 on my aem wideband. Im only running 6 lbs of boost, and it has been running great for a while. but since i downsized the turbo its been running super lean. i havent drove it yet because its kinda scaring me lol, so i dont know what the AFR's are yet at cruise and boost

 

did you reset your ecu ? do you have a fmu ?

i would think it would change alot because of different spool characteristics going to a different trim.your air flow has changed...i am guessing

but i might be wrong someone chime in on this!

 

Post this in the forced induction thread..
You'll get more of a response.

 

Maybe oil got on the spark plugs and fouled them?

 

Or maybe the oil has killed your O2 sensor so it's reading wrong?

 

1AZ was right. the difference in the spool is what made the ecu freak out. so i just reset the ecu and reset my base map and gave it time to relearn. all problems have been solved. Thanks you guys for your help

 

hey were are your bov and maf located. ?