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1989 GMC Sierra SLX 7.4L Poor Idle Quality
Aloha all, the owner of this truck had someone else working on it. aparently they replaced the distributor, MAP, Cap, rotor, plugs, and wires. The owner purchased an IAC motor that I installed. This vehicle runs like EGR is open and when I pushed on the EG...
FIX posted 5/9/2000
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Message Closed w/FIX
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| VIN | 1GTGKB4N4K |
| Engine | 7.4 L / 8 cyl |
| Symptoms | Poor Idle Quality |
| Occurs | Always |
Trouble Codes
| 15 | ECT low temp. |
| 21 | TPS voltage high |
| 22 | TPS voltage low |
| 32 | egr |
| 34 | MAP high vacuum |
Message Closed w/FIX
Vehicle Data
1989 GMC Sierra SLX
| VIN | 1GTGKB4N4K |
| Engine | 7.4 L / 8 cyl |
| Symptoms | Poor Idle Quality |
| Occurs | Always |
Trouble Codes
| 15 | ECT low temp. |
| 21 | TPS voltage high |
| 22 | TPS voltage low |
| 32 | egr |
| 34 | MAP high vacuum |
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