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Old 04-19-2012, 12:07 PM   #1
Join Date: Dec 2011
Location: Waldport, OR
Posts: 70
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Question Weird happenings

Ok, I've cleaned out the IAC and replaced the TSP sensor but my 2000 4.0 auto is still doing weird things at half a tank of gas. It rev's up about 400-500 RPM's over the idle. It does it in park and in drive but only at about a half of a tank. No vaccum leaks that I can find. I thought maybe it was the ingenuis internal fuel filter system but numerous folks have said that wouldn't cause that. I've spent $$ on fuel system cleaners too. Anyone have any clues? Any prior posts regarding these issues? Am I alone in the world?

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Old 04-21-2012, 09:44 AM   #2
Leeroy Jeepkins's Avatar
Join Date: Nov 2010
Location: Bucks County,PA
Posts: 493
try disconnecting the battery for a few minutes.when you start it back up let it idle for about 2-3 minutes. i believe the computer goes through a small series of tests to find it's proper idle. i was told to do this after i replaced my IAC. it may or may not help but it only takes a few minutes. not sure why it would do it at about half a tank of gas

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Old 05-07-2012, 06:03 PM   #3
Join Date: Dec 2011
Location: Waldport, OR
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solved...see my thread "I hate miecs to pieces"
"Aim small, miss small "
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