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1998 Oldsmobile Aurora 4.0L Spedo and Tach jump
At cold idle the tach in this car jumps up from the actual engine speed every few seconds. It jumps up about 200RPM. As the engine warms up (and the computers) it jumps more often and several thousand RPM. After driving a short distance the spedo starts to jum...
FIX posted 11/19/2000
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Related Documents & Media 
| VIN | 1G3GR62C9W |
| Engine | 4.0 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Spedo and Tach Jump |
| Occurs | Always, Worse Hot |
Trouble Codes
| P1602 | PCM Not Programmed |
| P1603 | PCM Internal Dual-Port Communication Failure |
| P1604 | PCM Internal Dual-Port Ram Read/Write Integrity Failure |
| P1605 | Loss Of HVAC Serial Data |
Message Closed w/FIX
Vehicle Data
1998 Oldsmobile Aurora
| VIN | 1G3GR62C9W |
| Engine | 4.0 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Spedo and Tach Jump |
| Occurs | Always, Worse Hot |
Trouble Codes
| P1602 | PCM Not Programmed |
| P1603 | PCM Internal Dual-Port Communication Failure |
| P1604 | PCM Internal Dual-Port Ram Read/Write Integrity Failure |
| P1605 | Loss Of HVAC Serial Data |
Video