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1991 Pontiac Firebird Formula 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on
PCM cannot maintain +5V when both TPS and MAP are
connected. Sensors are new, PCM replaced, per customer, by
other shops twice. Checked PCM ground and +12V ampacity.
Both OK. Isolated all PCM I/Os except +12V and ground and
affected circuits. No change.
FIX posted 8/19/2010
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Related Documents & Media | VIN | 1G2FS2384M |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | Fuel Injection |
| Symptoms | Excessive Emissions, Poor Idle Quality, Hesitation, Cuts Out, Stall, Misfire, MIL Lamp On |
| Occurs | Always |
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Vehicle Data
1991 Pontiac Firebird Formula
| VIN | 1G2FS2384M |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | Fuel Injection |
| Symptoms | Excessive Emissions, Poor Idle Quality, Hesitation, Cuts Out, Stall, Misfire, MIL Lamp On |
| Occurs | Always |
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