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Old 04-14-2022, 10:15 PM   #25
Just call me Sean
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Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
Re: Idles high after going from park to gear and back.

My truck had a grounding issue that altered the oxygen sensor readings. It was supposed to fluctuate back and forth between 0.1 and 0.9 volts but it was going into the negative. The computer thought it was running lean and dumped a bunch of fuel into the engine. It probably affected other systems, but that's how I found it. I had to ground the computer case to the battery, plus the headlights and blower motor, to make it work right.
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