rosulekg

Hi;

I have a STS in a 02 C5 Z06 and I am currently dealing with a AFR going from 10.8 one day to 9.8 the next at 4th gear WOT and 4600RPM, or so with the same boost. I have newer sensors. Is my PCM bad?

Thanks!

slow

iTrader: (7)

how are you tuning the car, and do you max your maf?

Ryan

12secSS

iTrader: (30)

Plus what kind of boost levels? That could be dangerously rich (similar to running too lean) if the boost is high.

rosulekg

I now have around 6lbs of boost and I think the MAF is good 550rwhp so my answer is probably not. But, the problem is tempeture related and with my a new MAF in yesterday it goes to low tens without boost at 57deg, at below 40deg maybe it's being richened up by the computer to in the nines. I recently put high flow CATs on so it probably just needs tuning to not make the above not possible. I am trying it without boost for a while to see if the low tens stay consistent at 3/4 throttle, if so I get the tune updated.

gametech

iTrader: (1)

At 550rwhp your maf is almost certainly maxed out, so any change in temp or baro will give different afr's.