Question about 1997 Chevrolet K1500

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97 chevy Truck ( 305) idles about 300 Rpm when cold. After warmup, it idles at 1500 RPM, or sometimes ok at about 750 RPM. Seems to run Ok otherwise. Power is a bit weak. EGR valve??

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  • Richard Scordino May 11, 2010

    Temp sensor, map sensor and mass air flow sensors are good places to begin testing. EGR is also good idea.

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Check you ivs or you Idle control modual

Posted on Jul 27, 2009

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Clean ur throttle body theres how to videos on you tube and cleaners about 8$ at autozone

Posted on Oct 02, 2012

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Increase then decrease idle when engine is cold especially


cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
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needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
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1week, 1year?
surge , causes, on a tuned engine might be:
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3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

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