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Old 06-22-2014, 08:55 AM
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High Idle Revs.

I have a clunk when I shift into D or R and believe that my idle revs are too high. The techs. computer readout shows 800 and whilst he can adjust upwards with the computer, he cannot get it below 800. He has stripped down and cleaned the low idle part and changed the transmission oil. The gear change is smooth when driving, but when climbing a steep hill, the change down doesn't occur unless I kick down on the accelerator pedal. I'm concerned that something in the driveline will be damaged if this continues. can anybody suggest what the problem might be.

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Old 06-22-2014, 03:31 PM   #2
Knows a couple things...

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A high idle is often caused by one of three things... a vacuum leak, a dirty Idle Air Control Motor (aka IAC), or a bad throttle position sensor. I'd rank them in that order so far as likelihood is concerned. The IAC can be cleaned with throttle body cleaner so I'd start there if you can't find a vacuum leak. The TPS would have to be replaced if it's bad.

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Old 06-22-2014, 07:25 PM   #3
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I just went thru this on my 97. Turned out to be the TPS.
I had autozone scan for codes since the check engine light was on.
Came up as TPS. Took it off and they tested that as well to double check.
50 bucks and 15 minutes it was back to normal idle.
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Old 06-23-2014, 09:16 AM
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Originally Posted by Jerry Bransford View Post
A high idle is often caused by one of three things... a vacuum leak, a dirty Idle Air Control Motor (aka IAC), or a bad throttle position sensor. I'd rank them in that order so far as likelihood is concerned. The IAC can be cleaned with throttle body cleaner so I'd start there if you can't find a vacuum leak. The TPS would have to be replaced if it's bad.
Thanks for your reply. IAC has been removed and cleaned, also checked for vacuum leaks. I guess this leaves me with the TPS to be checked.
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Old 06-23-2014, 09:17 AM
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Thanks for your reply. IAC has been removed and cleaned, also checked for vacuum leaks. I guess this leaves me with the TPS to be checked.
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Old 06-23-2014, 09:22 AM
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Thanks for your reply. Don't have any warning lights on and I have cleaned the IAC as well as checked for vacuum leaks. Do you know what the test procedure is for the TPS. I live a long way from Autozone, in Mexico.
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Old 06-23-2014, 09:59 AM   #7
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Do you know what the test procedure is for the TPS.
Unplug it and observe what happens.

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