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Problems for specific Porsche 911 years:

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Most reported 1990 Porsche 911 problems

 

Verified for the Porsche 911
If the engine won't turn over or cuts out at seemingly random times, it may be a failing relay for the DME system.
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Verified for the Porsche 911
A failing cylinder head temperature sensor can cause erratic running or the engine to cut out entirely.
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Verified for the Porsche 911
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 can solve the problem.
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Verified for the Porsche 911
In order to avoid ABS, Tiptronic, or intermediate differential faults/warning lights, correct tire profile and wear must be maintained.
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Verified for the Porsche 911
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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Verified for the Porsche 911
Fluid leaks at the right rear corner can often be traced to the radial seal at the power steering pump.
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Verified for the Porsche 911
Tire wear (especially in the rear tires) can be rapid and handling will suffer if the problem is not addressed.
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Verified for the Porsche 911
The release mechanism for the clutch (including the release arm bearings and shaft) can fail and cause stiff, binding, and possibly noisy pedal operation.
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Verified for the Porsche 911
The clutch release on early-production vehicles requires modification to make it compatible with newer repair parts.
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Verified for the Porsche 911
The hydraulic components for the clutch release mechanism at the clutch pedal can fail and cause a low, limp pedal feel.
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Verified for the Porsche 911
The hydraulic fluid for the clutch system may be overlooked; the fluid should be replaced regularly during brake fluid service.
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Verified for the Porsche 911
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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Verified for the Porsche 911
The spur gear drive area is prone to leaks; the seals/gaskets can be replaced without removing the transmission. 
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Verified for the Porsche 911

The constant velocity (CV) boots and CV joints should be inspected at each service. Servicing the torn CV boots early can prevent the need to replace the CV half shaft or CV joint.

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Verified for the Porsche 911

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

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