Idle high
50

Asked by Chrismcgregor97 Oct 27, 2017 at 12:58 AM about the 1990 Chevrolet C/K 1500 4WD

Question type: Maintenance & Repair

I have a 1990 k1500. Its idle high. Codes show a EGR , tps,
IAC, and now its shifting hard. Put it in drive and it almost
gives you whiplash.. You have to hit 30+ before it shifts out
of first. If you take off and stomp it. It shifts OK. Any help
on what is wrong with it.

6 Answers
101,515

KenF answered 6 years ago

Have you looked for any vacuum leaks? High idle is typical of unmetered air. Spritz a very light amount of starting fluid in and around vacuum lines or throttle body, if you get a corresponding bump in throttle you found where it's leaking from.

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Chrismcgregor97 answered 6 years ago

Not yet. It just started this tonight on my way home from work. It showed 1 code. EGR then today it showed the other codes. Didnt know if the egr would cause all of this

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60,305

Andrew answered 6 years ago

Egr, tps and iac can all cause this. Will the idle drop if you unplug the iac? Tps?

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Chrismcgregor97 answered 6 years ago

I'm working on it in the morning. I ordered all new parts. Going to change one at as time to see what causes it.

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Your Answer:

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