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1990 GMC 3500 7.4L Poor Idle Quality, MIL Lamp on
Hi there, this one ton c/c with 454 will start,but runs poor and the ses light blinks rapidly constantly, even when runnning. Had code 51 but not sure if its a old code. I tried 3 different computers and proms and no luck. Master tech cannnot commun...
FIX posted 6/25/1999
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Message Closed w/FIX
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| VIN | 1GDHR33N1L |
| Engine | 7.4 L / 6 cyl |
| Emissions | OBD |
| Symptoms | Poor Idle Quality, MIL Lamp On |
| Occurs | Always |
| Misc. | R Series |
Trouble Codes
| 51 | testing and results |
Message Closed w/FIX
Vehicle Data
1990 GMC 3500
| VIN | 1GDHR33N1L |
| Engine | 7.4 L / 6 cyl |
| Emissions | OBD |
| Symptoms | Poor Idle Quality, MIL Lamp On |
| Occurs | Always |
| Misc. | R Series |
Trouble Codes
| 51 | testing and results |