Question about 1999 Chevrolet K1500

2 Answers

I have a 88 chevy pickup 1500 with a 4.3 liter engine. I have high idle problem. I would do it once in a while and quit. Now it up and wont idle down. I have new throttle position sensor, map sensor. all the other sensors have been change within 3 months.

Posted by bigtrav245 on

  • 3 more comments 
  • bigtrav245 Oct 06, 2008

    The engine light did not come on at all. You were right when you said that the vacuun passage was blocked. When I removed the throttle body I found out that the idle control valve had come apart in my throttle and blocked the air flow. What I am puzzled about is why didnt the engine light come on? Thank you cause you put me in the right place to look.

  • dannynoonan1 Dec 02, 2008

    1995 chevy 1500 idles high , slowly drops to 1500 or so , rebuilt throtle body and replaced everything imaginable idle air valve , egr, temp sens , throtle pos sens , etc , no change , no engine light on

  • Anonymous Mar 12, 2014

    2.4 liter wants to idle at 1600 to 1800 rpm. throttle body linkage shows it is in normal position.

  • Anonymous Mar 24, 2014

    engine uncontrollable high idle

  • Anonymous Mar 25, 2014

    idling high. have adjusted idle srew with no results. Is it the throttle sensor?



2 Answers


It is a vaccuum leak but its not at the egr valve the proble is te vaccuum canister on the opposite side from the battery the can rusts out on the bottom and begins to leak. you can plug the lines to test and see if its the proble.

Posted on Oct 29, 2008


pat murray

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Is the check engine light on ? if it idling high chances are you have a vacuum leak take a can of carb cleaner and spray the egr valve and if the engine rpm changes replace egr valve the throttle body may also be plugged pull the vacuum line off the map sensor start vehicle and see if you have vacuum if not remove throttl body and clean vacuum passage hope this helps

Posted on Oct 05, 2008


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