TPI High idle
11-17-2007, 12:27 AM
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TPI High idle
okay i set my timing ,iac minimum air rate,and tps voltage as directed in the tech articles and i still got a high idle(like 1100 warm in park)ive also changed the intake gaskets to try to cure this problem with no results,what am i doing wrong?ive had this car for 5 years and its always had a high idle ,even after engine rebuild,my iac minimum air rate will set to 450 in drive ,tps is set to 0.54vdc,and timing is set to 6*btdc,did i miss something?SOMBODY PLEASE HELP ,any help would be greatly appreciated.
11-17-2007, 12:40 AM
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Car: 2000 Z28
Engine: LS1
Transmission: 4l60e
Axle/Gears: stock 10bolt with cover/3.73
Re: TPI High idle
Have you tried a new and old priest? jking. Is your pcv in good shape? taken your intake off and checked the throttle body? maybe its not completely closed, I had one with a bunch of gunk built up that would make it stick a little. clean your MAF with a Qtip and rubbing alcohol if its dirty lookin.
11-17-2007, 07:58 PM
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Re: TPI High idle
Have you tried a new and old priest? jking. Is your pcv in good shape? taken your intake off and checked the throttle body? maybe its not completely closed, I had one with a bunch of gunk built up that would make it stick a little. clean your MAF with a Qtip and rubbing alcohol if its dirty lookin.
11-17-2007, 08:02 PM
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Car: numerous
Engine: ls1, others
Transmission: t56, others
Axle/Gears: 3.23 7.6"
Re: TPI High idle
i found in mine there is a small rib type thing inside the throttle body that stops the blade from actually closing all the way to the idle screw. My solution was to unplug IAC
11-19-2007, 10:13 PM
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Car: 89 Trans Am... 92 25th RS
Engine: TPI 350 .03 over ported lower&bowls
Transmission: 700R
Axle/Gears: 2:73
Re: TPI High idle
I had the same problem you describe and it turned out to be a bad computer. It gave me none of the normal signs but when i finally broke down and had it scanned the scanner couldn't comunicate with it. The idle would go up to 1100 as after driving for 10 to 15 min due to heat in the ecm. Just my thoughts... I wish you luck!
11-19-2007, 10:32 PM
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Car: 87 GTA / 87 IROC-Z
Engine: 350 TPI / 350 TPI
Transmission: 700R4 / 700R4
Axle/Gears: Stock
Re: TPI High idle
same issue turned out to be a vac leak on the driver side intake runner
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