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Porsche » 911 » 1991 Porsche 911 » Car Problems

Problems for specific Porsche 911 years:

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1991 Porsche 911 Problems

Check Engine Light due to faulty oxygen sensor

for the Porsche 911

Check Engine Light illumination and performance issues can be caused by oxygen sensor faults.

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Brake warning light on in AM

for the Porsche 911

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 low stored hydraulic pressure due to a failed high pressure accumulator.

10 Reports

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Brake fluid leak from pressure switch

for the Porsche 911

An external fluid leak may develop at the pressure switch; fluid will be evident in the trunk and the reservoir level will drop.

10 Reports

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Engine Oil Leaks

for the Porsche 911

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, timing cover, chain housings, case through bolts, and lines to/from the oil cooler.

10 Reports

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Engine misfire or excess fuel consumption can damage catalytic converter

for the Porsche 911

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

10 Reports

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Failed Hood and Deck Lid Supports

for the Porsche 911

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

10 Reports

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Repairs and adjustments on the Cabriolet tops

for the Porsche 911

Various repairs and adjustments to the drive mechanism (including cables) are commonly needed on the Cabriolet tops.

10 Reports

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Brake hydraulic pump relay stays on

for the Porsche 911

The hydraulic pump relay can fail, causing the pump to run continuously, which leads to hydraulic pump failure due to overheating. Incorrect pressures will cause a low brake pedal or a high pedal effort with the possibility of other strange symptoms.

9 Reports

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ABS light on due to moisture and corrosion

for the Porsche 911

The accumulation of moisture at major connectors and control units can cause various ABS/PDAS faults due to corrosion.

9 Reports

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Inspect brakes regularly and investigate warning lights

for the Porsche 911

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, including "waxy" buildup visible in the reservoir, so replace the brake fluid regularly. Special procedures are required to bleed/flush ABS pump.

9 Reports

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Engine Valve Guide Wear

for the Porsche 911

Engine issues related to valve guide wear are common. Oil consumption, smoking at first startup, and valve train noise are all symptomatic of loose guides and worn valve stems. The valve train is complex and should be thoroughly inspected if a problem arises.

9 Reports

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Distributor internal drive belt

for the Porsche 911

The ignition distributor's internal drive belt can fail and cause misfires and performance problems. After being updated, the distributor belt requires regular inspection.

9 Reports

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Inspect secondary ignition system components

for the Porsche 911

Pay close attention to secondary ignition system components (distributor caps, rotors, cables, and connectors).

9 Reports

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Early model belts and pulley

for the Porsche 911

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.

9 Reports

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