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1990 Porsche 928 Problems

 

Monitor warning lights and inspect brakes

Verified for the Porsche 928
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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Timing belt inspection and adjustment

Verified for the Porsche 928
Timing belt life cannot be ascertained by inspection only. The timing belt and water pump must be maintained using the correct belt-adjustment tool. 
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Air leaks from intake manifold

Verified for the Porsche 928

Intake air leaks at the manifold and elsewhere are common.

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Mass air flow (MAF) meters may fail

Verified for the Porsche 928
Mass air flow meters can fail unexpectedly.
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"No start" due to fuel pump or ECM failure

Verified for the Porsche 928
A failing ECM or a fuel pump issue can cause a "No Start" condition.
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Worn Thrust Bearing in Transmission Due to Driveshaft/Flex plate Alignment

Verified for the Porsche 928

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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Suspension components require regular inspection

Verified for the Porsche 928

Suspension components (including ball joints) are critical and require regular inspection.

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Problems with tire pressure monitoring system

Verified for the Porsche 928
The tire pressure monitoring system may have problems.
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Clutch noise and shifting problems due to wear issues

Verified for the Porsche 928

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

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Clutch system issues due to contaminated fluid

Verified for the Porsche 928
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.
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PSD locking system light due to wear in the multi-disc clutch

Verified for the Porsche 928
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.
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Inspect CV Boots and Joints at Each Service

Verified for the Porsche 928

The constant velocity (CV) boots and CV joints should be inspected at each service.

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Central warning system erratic due to electrical interference

Verified for the Porsche 928
Due to electrical interference from cell phones and secondary ignition faults, the vehicle's central warning system display can be erratic.
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Faulty switches and controls

Verified for the Porsche 928
Erratic switches and controls can cause electrical problems.
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Wiring issues due to deteriorated connectors

Verified for the Porsche 928
Aged and deteriorated connectors can cause common wiring issues; repair requires care and vehicle-specific information.
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