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1991 Porsche 928 Problems

Find the most common issues based on 1991 Porsche 928 owner complaints.
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Most Common 1991 Porsche 928 Problems

Mass air flow meters can fail unexpectedly.
A failing ECM or a fuel pump issue can cause a "No Start" condition.
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.
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2 Known 1991 Porsche 928 Brakes Problems

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.
Aged brake fluid can cause numerous problems and should be replaced regularly.

4 Known 1991 Porsche 928 Drive Train Problems

Mechanical wear in the clutch and clutch release mechanism can cause shifting engagement and noise issues.
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...
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...

4 Known 1991 Porsche 928 Electrical & Lights Problems

Due to electrical interference from cell phones and secondary ignition faults, the vehicle's central warning system display can be erratic.
Erratic switches and controls can cause electrical problems.
Aged and deteriorated connectors can cause common wiring issues; repair requires care and vehicle-specific information.

6 Known 1991 Porsche 928 Engine Problems

Mass air flow meters can fail unexpectedly.
A failing ECM or a fuel pump issue can cause a "No Start" condition.
Timing belt life cannot be ascertained by inspection only. The timing belt and water pump must be maintained using the correct belt-adjustment tool.

1 Known 1991 Porsche 928 Exhaust & Emissions Problem

If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.

1 Known 1991 Porsche 928 Heating & Air Conditioning Problem

When changing speeds at random or while going over bumps, the interior fan speed can be erratic. A replacement fan control resistor is required.

0 Known 1991 Porsche 928 Maintenance Problems

1 Known 1991 Porsche 928 Miscellaneous Problem

The front hood and rear deck lid support struts may fail; replacement is required.

2 Known 1991 Porsche 928 Suspension & Steering Problems

Suspension components (including ball joints) are critical and require regular inspection.
The tire pressure monitoring system may have problems.

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Known 1991 Porsche 928 Problems & Complaints

The constant velocity (CV) boots and CV joints should be inspected at each service.
The ignition system must be maintained—distributor caps, rotors, and cables require attention. The misfire detection system can cause the engine to shut down by half. The root cause of the problem ...
Aged brake fluid can cause numerous problems and should be replaced regularly.
Timing belt life cannot be ascertained by inspection only. The timing belt and water pump must be maintained using the correct belt-adjustment tool.
Intake air leaks at the manifold and elsewhere are common.
Mass air flow meters can fail unexpectedly.
A failing ECM or a fuel pump issue can cause a "No Start" condition.
Suspension components (including ball joints) are critical and require regular inspection.
Mechanical wear in the clutch and clutch release mechanism can cause shifting engagement and noise issues.
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...
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...
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.
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.
The front hood and rear deck lid support struts may fail; replacement is required.
When changing speeds at random or while going over bumps, the interior fan speed can be erratic. A replacement fan control resistor is required.
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