1990 Porsche 911 Problem Reports

Most Reported 1990 Porsche 911 Problem Reports

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Using the wrong battery or the failure of a climate control module may cause a chronic dead battery after the vehicle has not been used for a while.
The vehicle central warning display can be sensitive to interference from vehicle ignition faults such as high voltage arcing anywhere in system. Battery capacity must be adequate to avoid electrical issues; also, the battery must be maintained and checked regularly.
Moisture accumulation within instruments can be traced to small leaks at the windshield and can usually be resolved without removing the glass.
The dual mass flywheel can fail and cause symptoms like noise and chatter when operating the clutch and changing gears.

Climate control modules can be problematic. Symptoms vary but include failure or persistent dead battery after not using the vehicle for a while.

An accumulation of small air leaks at various locations around the intake manifold/intercooler area can cause performance problems.