Quote:
Originally posted by zhound
Mike, you have a custom ECU for your car. I have the exact same program as you and the o2 targets are way off :-(. The A/F at idle changes constantly so it idles either too rich or too lean. We ended up disconnecting the o2 sensors and just tune the a/f for the idle using the AFC. Also the a/f under boost was in the 10:1 range.
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What sort of A/F sensor did you use for tuning? My motor on the pump gas program, which really isnt a custom program (it was developed on a nearly identical motor that Sunbelt built on their engine dyno, I just modified it some off boost to expand the closed loop area and have more spark advance off boost to make up for the 8:1 compression)
It sounds like your car might have some other problems, like a bad MAF (which I have been seeing a lot of lately) . The A/F is clamped at idle which leads me to belive this, it should be cycling lean on the A/F monitor. The WOT A/F ratio should be about 10.5-10.7:1 on the pump gas program.
Bring your car over, we can put it on Consult and do some trouble shooting. With the Twin POP the MAF voltage should be near zero but no more than a few hundered Mv. A dirty hot wire can cause symtoms like you are seeing. Water contamination is a likely culprit. I think its a higher milage car thing.
Mike