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1991 Buick Regal Gran Sport 3.8L Poor Idle Quality, MIL Lamp on
This is a very random problem. One tech replaced the TPS for low voltage (.2 volts). The high idle/high throttle angle problem returned in a week. Again there was a TPS code. The IAC motor was replaced. Then the ECM replaced. The problem went away for about 3 ...
FIX posted 5/18/2004
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Message Closed w/FIX
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9 Replies Received
9 Replies Received
Related Documents & Media | VIN | 2G4WD54L6M |
| Engine | 3.8 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / SEFI |
| Symptoms | Poor Idle Quality, MIL Lamp On |
Trouble Codes
| 15 | CTS voltage high |
| 16 | charging system voltage too high |
| 21 | TPS voltage high |
| 22 | TPS voltage low |
| 23 | MAT voltage low |
| 43 | ESC circuit malfunction |
Message Closed w/FIX
Vehicle Data
1991 Buick Regal Gran Sport
| VIN | 2G4WD54L6M |
| Engine | 3.8 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / SEFI |
| Symptoms | Poor Idle Quality, MIL Lamp On |
Trouble Codes
| 15 | CTS voltage high |
| 16 | charging system voltage too high |
| 21 | TPS voltage high |
| 22 | TPS voltage low |
| 23 | MAT voltage low |
| 43 | ESC circuit malfunction |
Video