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Hello,
As the subject states I am still diagnosing a rough idle. The car will idle OK for about 10-15 seconds around 750 RPM, but then it will stumble down to 400-500 RPM. To compensate the ECU will the advance the timing and increase the air provided by the AAC valve and the car will idle normally again, the cycle repeats forever.Using my Ebay OBDII cable I can see that the O2 sensor voltage readings at idle are different: left - 0.02v, 0.03v
right - 0.04v, 0.05v The car sounds healthy at any throttle position (except at idle) and eventually both O2 sensors report the same voltage on each side. I recently replaced both O2 sensors. If it's an air leak, what can be learned from the right bank running richer at idle than left bank? What can be learned about my problem?
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