Very High Idle Issue

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May 14th, 2007, 10:27 AM

rat55chevy

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Very High Idle Issue

I have a 97 S10 Blazer with a 4.3L engine that is idling very high. At startup it runs between 2500 & 3000 RPM. Did the general assumption and looked for vacuum leaks. Quite certain there is no vacuum issue. I disconnected the accelerator cable and the engine idles normally. No apparent binding in cable or throttle body. I assume its the PCM doing the accelerating. Is this a symptom of a bad MAP or TPS?

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May 25th, 2007, 3:43 AM

luv my truck

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RE: Very High Idle Issue

My guess it's the TPS (throttle positioning sensor) I have a '99 Silverado w/ 5.3 and it did the same thing and I replaced the TPS and it fixed the problem