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1989 GMC C3500 7.4L Excesive Idle Speed
This vehicle will idle at normal speed (600 rpm) in park or neutral. When the vehicle is shifted to a drive gear, the IAC counts are pushed over 100 and the idle speed is driven to 800 rpm. When shifted back to park or neutral, the idle speed remains high and ...
FIX posted 1/14/1999
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Message Closed
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| VIN | 1GDGC34N6K |
| Engine | 7.4 L / 8 cyl |
| Emissions | CA emission |
| Symptoms | Excesive Idle Speed |
| Occurs | Hot |
Message Closed
Vehicle Data
1989 GMC C3500
| VIN | 1GDGC34N6K |
| Engine | 7.4 L / 8 cyl |
| Emissions | CA emission |
| Symptoms | Excesive Idle Speed |
| Occurs | Hot |