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stuck at high idle !

mike z71

By mike z71
in Ask A GM Technician

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mike z71 Enthusiast

mike z71

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hi there my truck gets stuck idling at 1200rpm extremely noticeable when approaching a stop light as truck wants to push you. if i turn truck off for a few seconds and restart problem disapears until you drive a few more kms. truck never stalls. i have been to local chev dealer with this problem 5 times now first time they updated the computer. second they cleaned throttle body third they cleaned iac valve fourth they replaced iac valve fifth time they had the truck all day and said they found another computer update. i think they are stumped ! all this work has cost me over $400 cdn i have tryed to do some research on this problem the last couple nights and havnt found very much info could this have anything to do with my tranny? it shifts kind of hard between 1-2 gears or would the throttle position switch be a possibility? any help would be greatly apprieciated thank you mike

mike z71 Enthusiast

mike z71

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hi thanxs for the input chev dealer has mentioned that no codes are showing. my instrument panel never indicates any problems. does a tps switch have anything to do with the tranny? what does it do? thanxs again mike!

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
hi thanxs for the input chev dealer has mentioned that no codes are showing. my instrument panel never indicates any problems. does a tps switch have anything to do with the tranny? what does it do? thanxs again mike!

 

 

 

 

 

Yes, the TPS is involved in trans operation.

  • 5 months later...
jadannin Enthusiast

jadannin

Posted
Posted

I was wondering if this problem was ever identified. I am having the same problem on my 2000 Silverado (80k miles). Normal idle after start-up, around 60-700 rpm. Then after driving for a little bit, when I come to a stop, I have a high idle around 1200 rpm when truck is in neutral or park. I have not checked for codes, but do not have a check engine light or any other indication from the dash. Any help or information would be appreciated.

 

Thanks!

69BOWTIE Enthusiast

69BOWTIE

Posted
Posted
I was wondering if this problem was ever identified. I am having the same problem on my 2000 Silverado (80k miles). Normal idle after start-up, around 60-700 rpm. Then after driving for a little bit, when I come to a stop, I have a high idle around 1200 rpm when truck is in neutral or park. I have not checked for codes, but do not have a check engine light or any other indication from the dash. Any help or information would be appreciated.

 

Thanks!

Count me in allso (2001), mine will kick down to normal idle after a second or 2 at a light or stop sign I have cleaned all the above except for the TPS.I have to constantly ride brakes when going through parking lot now they squeek.No codes for mine either this is really annoying.

69BOWTIE Enthusiast

69BOWTIE

Posted
Posted

I cleaned my IAC valve and it seemed to help went to town the other day and it was doing it again.Where is the TPS at can I clean that truck is at 110k miles :thumbs:

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