Question about 1988 Chevrolet C1500

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My 88 chevy cheyenne has a problem with a fast idle. I don't know how to slow it down. It is a fuel injection throttle body set up. I can't afford to just start replacing parts till I find the problem. Any idea what it might be? It is a 4.3 v-6 auto. 2wd. Thanks Dave

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One easy thing you can try is spray some carb.or brake cleaner around the throttle body area.The gaskets on these were known to go out and this will cause a fast idle.The other thing is make sure the throttle cable or linkage is not sticking or binding.Hope this helps.Good luck.Let me know what you find out.

Posted on May 12, 2010

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SOURCE: My 88 chevy cheyenne has a problem with a fast

there are 2 main things that cause fast idel. the first is the computer is malfuntioning and the second is the TPC throdle posistion sensor

Posted on Mar 18, 2010

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your fast idle problem might be caused by your coolant temperature sensor not getting a good flow of hot coolant. The sensor is mounted up on top of your throttle body. Here's a test: after you have just made a trip, put your fingers on the area where the coolant temperature sensor is. It should be very hot, but I suspect yours will be only lukewarm. Unless that sensor gets hot, your computer will stay in the "warmup" mode forever. Your idle speed will not be controllable, your fuel mileage will be poor and your engine will run a little hotter than normal. The coolant flow needs the throttle body to pass fluid freely and also your interior heater core is part of that flow, so that can't be obstructed either. The coolant flow ports are very narrow and sometimes they get a piece of gasket sealer caught in the throttle body. Get some air and blow it out. Good Luck, friend.

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