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1989 GMC C2500 Sierra 5.7L Poor Idle Quality
This truck has an erratic idle. Sometimes high (1000), sometimes very low (450). Items that have been replaced: IAC O2S CTS PCM PROM Swapped TBI unit from 1990 truck Replace base gasket Scan data is good except truck will rarel...
FIX posted 7/9/1999
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| VIN | 1GTGC24KXK |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI EFI |
| Symptoms | Poor Idle Quality |
| Occurs | Always, Idle |
Trouble Codes
| 51 | Prom Error |
Message Closed w/FIX
Vehicle Data
1989 GMC C2500 Sierra
| VIN | 1GTGC24KXK |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI EFI |
| Symptoms | Poor Idle Quality |
| Occurs | Always, Idle |
Trouble Codes
| 51 | Prom Error |
Video