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Reset the computer. Disconnect the battery, turn on headlights, turn off headlights, reconnect battery. Turn ignition to "On", not start, count to 10, don't touch ANYTHING. THEN start the truck. If things are working right, it should figure out idle right quick. If it doesn't, somethin' else is going on. Wouldn't be the first time the IAC drivers in the PCM have failed. I would expect that to set a P0505 code though.....
That's what I am planning to do tomorrow. Had to take a day to recover from what I did on Red yesterday.
I'll definitely let ya'all know my progress.
OK, quick update....HeyYou was correct...the hard PCM reset seems to have done the job. Originally tried to see if it would self resolve before the PCM reset...nope no joy. Pulled the negative cable off the battery and while doing so discovered the battery place had put a "cap" over the negative terminal of the battery. When we removed the terminal, it was flaking off...this might have been an issue as well. But thankfully after cleaning it and the terminal, she fired right up and behaved herself like always.
Thanks all. Now to order a electric cooling fan to replace the dead one I discovered
So another TPS related question about the high idle. It hasn't come back (thankfully) but I did notice something a bit odd when I was trying to diagnose the issue. I have a Harbor Freight Cen-Tech OBD II reader similar to the Autel reader pictured below: Autel OBD II code reader similar in design and function to my Cen-Tech OBD II reader (just couldn't find the exact one, guess I could have gone outside and taken a picture of the actual reader but its extremely windy and cold) lol
Anyways on to my question, When I looked at my OBD II reader, the live data showed (with the engine OFF) the TPS @ 11.4% at IDLE and 76.1% at FULL THROTTLE. The same test with the engine running showed idle at 11.4% and no I did not try and redline it to see if the 76.1% was constant. OBD II Live data (engine off) TPS reading 11.4% at wide open throttle OBD II Live data (engine off) TPS reading 76.1% at wide open throttle
So I thought it may be just how the 4.7L engines act...I tried it out on my dad's 2006 Ram 3500 diesel (yeah I know apples and oranges but it was something to at least check) and found his went 0-100%. Is this something that needs to be "tuned" to achieve proper/correct readings for 0-100% on the Durangos or is it basically doing what its supposed to??
I pay more attention to the throttle blade itself. If it is all the way closed at idle, and all the way open with the pedal on the floor, yer good. PCM will figure out what 'relative' throttle position is by airflow, more than what the tps is telling it. TPS just gives the PCM a general idea in how hard you want to accelerate. So, it's all good.
