Quote:
Originally Posted by cmelkoni
uppallnight,
Thanks for the suggestion. My scanner does allow me to check live data. Bank 1 has positive Long Term and negative Short Term. Bank 2 has the opposite. Here are some numbers at idle and 2500 RPM:
Idle
Bank 1 LT: +5.5
Bank 1 ST: 0.0 to -3.0
Bank 2 LT: -0.8
Bank 2 ST: 0.0 to +3.0
2500 RPM
Bank 1 LT: +5.5
Bank 1 ST: 0.0 to -3.0
Bank 2 LT: -0.8
Bank 2 ST: +4.0 to +7.0
What it looks like is that upon going to 2500 RPM, both Short Term trims change, but Bank 1 quickly goes back to the same value as at idle while Bank 2 stays more positive.
From your post, it looks like this is pointing to a vacuum leak. Would appreciate your opinion/direction.
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One area that I would look at is the rubber bellow boot that connects the throttle body, Idle Control Valve to the MAF. The bellow portion of the boot that connects to the IAC normally tears. If you haven't replace it recently, take a look at that.