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1990 Porsche 928 Problems
Monitor warning lights and inspect brakes
Pay close attention to warning lights and have the brakes inspected regularly—immediately address any brake problems. Hard driving habits will cause excessive brake pad and rotor wear.
5 Reports
Timing belt inspection and adjustment
Timing belt life cannot be ascertained by inspection only. The timing belt and water pump must be maintained using the correct belt-adjustment tool.
5 Reports
Worn Thrust Bearing in Transmission Due to Driveshaft/Flex plate Alignment
An alignment issue at the driveshaft/flex plate interface can cause a worn engine thrust bearing in the automatic transmission. Revised parts and assembly procedures are available.
5 Reports
Suspension components require regular inspection
Suspension components (including ball joints) are critical and require regular inspection.
5 Reports
Problems with tire pressure monitoring system
The tire pressure monitoring system may have problems.
5 Reports
Clutch noise and shifting problems due to wear issues
Mechanical wear in the clutch and clutch release mechanism can cause shifting engagement and noise issues.
5 Reports
Clutch system issues due to contaminated fluid
The hydraulic fluid for the clutch system may be overlooked; the fluid should be replaced regularly during brake fluid service. If aging or contaminated fluid is not replaced, there may be problems in the lines and actuating components, as well as clutch issues that are difficult to diagnose.
5 Reports
PSD locking system light due to wear in the multi-disc clutch
Due to wear in the differential multi-disc clutch, the PSD (Porsche Slip Differential) locking system light may illuminate. The independent hydraulic fluid supply for the PSD needs to be maintained properly, including the filling/replacement of fluid before problems develop.
5 Reports
Inspect CV Boots and Joints at Each Service
The constant velocity (CV) boots and CV joints should be inspected at each service.
5 Reports
Central warning system erratic due to electrical interference
Due to electrical interference from cell phones and secondary ignition faults, the vehicle's central warning system display can be erratic.
5 Reports
Wiring issues due to deteriorated connectors
Aged and deteriorated connectors can cause common wiring issues; repair requires care and vehicle-specific information.
5 Reports
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