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1990 Chev/GMC Truck c3500 7.4L Fast Idle
Does anyone know how to lower the idle speed over the factory preset value. The engine idles at 750 rpm and I would like to lower it to 500 rpm. Is there someone who reprograms the proms? Thank You Paul
FIX posted 7/31/1999
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Message Closed w/FIX
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| VIN | [No VIN Available] |
| Engine | 7.4 L / 8 cyl |
| Emissions | CA EMISSIONS |
| Symptoms | Fast Idle |
| Occurs | Hot |
| Misc. | Engine Swap |
Message Closed w/FIX
Vehicle Data
1990 Chev/GMC Truck c3500
| VIN | [No VIN Available] |
| Engine | 7.4 L / 8 cyl |
| Emissions | CA EMISSIONS |
| Symptoms | Fast Idle |
| Occurs | Hot |
| Misc. | Engine Swap |