GravisMaximus
Junior Member
OK so its been a couple weeks since I did the decat and muffler debaffle, my first o2 readings looked just fine. But I decided to recheck this weekend seeing how I was doing a throttle bodysync, and I've noticed the tone of the exhaust changes in different rpms (not the way it should). The exhaust sounds fluttery. What I've found is the o2 readings are 750-800 mv at all rpm ranges except from 5-7000. The reading drops right to 0 or real close to it, so that's no good running lean. The question is why? What is the ecm doing at that rpms that's different? The AIS is still hooked up but from what I've read the solenoid turns on at closed throttle and when under 140 degrees. So that should not be it. Any other ideas?
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