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1990 Porsche 911 Problems

Find the most common issues based on 1990 Porsche 911 owner complaints.
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Most Common 1990 Porsche 911 Problems

The front hood and rear deck lid support struts may fail; replacement is required.
Over time, the engine can leak oil at various locations. Early-production vehicles require engine disassembly and modification to resolve leaks at the cylinder heads, oil return tubes, valve covers...
Wind noise at the front of the car and water leaks at the vent wing are typical problems on Targa models.
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5 Known 1990 Porsche 911 Brakes Problems

The accumulation of moisture at major connectors and control units can cause various ABS/PDAS faults due to corrosion.
The brake warning display and warning gong can activate, typically after the first start of the day. The warning light/gong might stop after idling for a short time. This fault is usually caused by...
An external fluid leak may develop at the pressure switch; fluid will be evident in the trunk and the reservoir level will drop.

8 Known 1990 Porsche 911 Drive Train Problems

The release mechanism for the clutch (including the release arm bearings and shaft) can fail and cause stiff, binding, and possibly noisy pedal operation.
The clutch release on early-production vehicles requires modification to make it compatible with newer repair parts.
The hydraulic components for the clutch release mechanism at the clutch pedal can fail and cause a low, limp pedal feel.

4 Known 1990 Porsche 911 Electrical & Lights Problems

A normal operating clock may cause the airbag warning lamp to illuminate or a chronic dead battery.
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 electric...

8 Known 1990 Porsche 911 Engine Problems

Over time, the engine can leak oil at various locations. Early-production vehicles require engine disassembly and modification to resolve leaks at the cylinder heads, oil return tubes, valve covers...
The ignition distributor's internal drive belt can fail and cause misfires and performance problems. After being updated, the distributor belt requires regular inspection.
If the engine won't turn over or cuts out at seemingly random times, it may be a failing relay for the DME system.

2 Known 1990 Porsche 911 Exhaust & Emissions Problems

Check Engine Light illumination and performance issues can be caused by oxygen sensor faults.
If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.

1 Known 1990 Porsche 911 Heating & Air Conditioning Problem

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

0 Known 1990 Porsche 911 Maintenance Problems

4 Known 1990 Porsche 911 Miscellaneous Problems

The front hood and rear deck lid support struts may fail; replacement is required.
Wind noise at the front of the car and water leaks at the vent wing are typical problems on Targa models.
Creaking noises while driving over bumps and when cornering may be difficult to diagnose, but are usually caused by the windshield at the body/seal area. The latest version seal and/or lubricant ca...

4 Known 1990 Porsche 911 Suspension & Steering Problems

Fluid leaks at the right rear corner can often be traced to the radial seal at the power steering pump.
In order to avoid ABS, Tiptronic, or intermediate differential faults/warning lights, correct tire profile and wear must be maintained.
The front control arms should be regularly inspected for wear at the ball joints and bushings. Ball joint boot cracks/tears can lead to ball joint wear and failure.

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Known 1990 Porsche 911 Problems & Complaints

Climate control modules can be problematic. Symptoms vary but include failure or persistent dead battery after not using the vehicle for a while.
Creaking noises while driving over bumps and when cornering may be difficult to diagnose, but are usually caused by the windshield at the body/seal area. The latest version seal and/or lubricant ca...
Wind noise at the front of the car and water leaks at the vent wing are typical problems on Targa models.
Moisture accumulation within instruments can be traced to small leaks at the windshield and can usually be resolved without removing the glass.
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 electric...
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 spur gear drive area is prone to leaks; the seals/gaskets can be replaced without removing the transmission.
The hydraulic components for the clutch release mechanism at the clutch pedal can fail and cause a low, limp pedal feel.
Tire wear (especially in the rear tires) can be rapid and handling will suffer if the problem is not addressed.
Fluid leaks at the right rear corner can often be traced to the radial seal at the power steering pump.
The front control arms should be regularly inspected for wear at the ball joints and bushings. Ball joint boot cracks/tears can lead to ball joint wear and failure.
In order to avoid ABS, Tiptronic, or intermediate differential faults/warning lights, correct tire profile and wear must be maintained.
A failing cylinder head temperature sensor can cause erratic running or the engine to cut out entirely.
If the engine won't turn over or cuts out at seemingly random times, it may be a failing relay for the DME system.
In early models, the alternator/fan belts and bearing at the pulley must be correct. Updated parts are required for the alternator/fan pulley, as well as the belt tension monitor.
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