[rwest]

Hi Al,

I don’t think my O2 is bad, because as I add fuel, the AFRs come back to normal and the engine runs better. If it was reading wrong and I added 3 times as much fuel value, I think that it would still read lean and the car would die, correct?

There is a definite problem as I did an hour drive and over 50 miles a couple months ago doing the “left foot dyno” and my fuel values were at the lower numbers and car ran well.

Something has changed and it seems like when I first start it, it’s running fairly well and as it warms up it starts going lean. When I say warmup, it is still in enrichment mode by quite a bit; engine is less than 100F. Leading me to think as the pump gets hot, it pumps less volume- I could be wrong, but it makes sense to me.

Rutager