98 Chevy S10 Idle Speed Problem

1998 CHEVROLET TRUCK
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YOUNG
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I have a 98 Chevy S10, 177,000 miles, 2.2L 4-cyl. A few days ago it started idling at full throttle. It would drive OK in gear, but it idled at full speed.

The check engine light came on, and I have 2 error codes:

P0336-- Crankshaft Position Sensor A Circuit Range/Performance

P0507--Idle Control System RPM Higher Than Expected

I found a busted vacuum hose and replaced it. Now the engine lopes excessively at idle, but doesn't race like before. Any hints at this point would be greatly appreciated.
Mar 2, 2007 at 8:21 AM
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RASMATAZ
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[quote:9e465fc17c="Young"]I have a 98 Chevy S10, 177,000 miles, 2.2L 4-cyl. A few days ago it started idling at full throttle. It would drive OK in gear, but it idled at full speed.

The check engine light came on, and I have 2 error codes:

P0336-- Crankshaft Position Sensor A Circuit Range/Performance

P0507--Idle Control System RPM Higher Than Expected

I found a busted vacuum hose and replaced it. Now the engine lopes excessively at idle, but doesn't race like before. Any hints at this point would be greatly appreciated.[/quote:9e465fc17c]

Try cleaning out the throttle body and recheck the idle speed control/IAC
Mar 2, 2007 at 3:05 PM
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