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.
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Newest reported 1994 Porsche 928 problems
The AC climate control system can be erratic. Diagnoses of the interior sensors, actuators, and control assembly will be necessary to determine the cause of any AC problems.
Mechanical wear in the clutch and clutch release mechanism can cause shifting engagement and noise issues.
Suspension components (including ball joints) are critical and require regular inspection.
Aged brake fluid can cause numerous problems and should be replaced regularly.
When changing speeds at random or while going over bumps, the interior fan speed can be erratic. A replacement fan control resistor is required.
If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.