Didn’t you perform a throttle plate relearn after installing the throttle body? You stated you did so in post # 21.
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Did you ever check what the ECT is showing with the KOEO and overnight cold, or at least 3 hours not running? Should be about what the ambient temp is…
Idle relearn procedure is different from an ECM/PCM reset. ECM/PCM reset is a reprogramming of the car’s computer, which can only be done with Honda’s i-HDS Diagnostic Software and J2534 Reprogramming Software thru a suitable Vehicle Communication Device (VCI) that is compliant with SAE J2534-1 and J2534-2… or so I’m told.
Yes, my apologies for not reporting the results of that. After the car sat overnight without starting the ECT temp was the same as ambient temp.
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I tried to edit the title to indicate that I solved the problem and I inadvertently created a new thread. davesmopar suggested I should put my reply in this thread and I agree, so here it is again:
SOLVED! After much poking and prodding and repeated futile attempts to bring down the high idle using the “idle relearn procedure” I finally succeeded. It was only after I unplugged and replugged the Accelerator Pedal Position Sensor that the idle relearn procedure had the desired effect.This may be coincidental, and there may have been some other reason for my success, but it was only after doing this that my efforts paid off.
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Found this when looking up info on the accelerator pedal position sensor:
"A faulty accelerator pedal position sensor can make an idling engine run at higher revolutions per minute (RPM) than expected."
Apparently the fault was not with the accelerator pedal position sensor, but with the wiring connector. The effect, however, was the same. I am surprised that the accelerator pedal position sensor did not show up in a single search I did for causes of a high idle condition.
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