1990 Porsche 911 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Porsche 911

1990 Porsche 911 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, timing cover, chain housings, case through bolts, and lines to/from the oil cooler.

Wind noise at the front of the car and water leaks at the vent wing are typical problems on Targa models.

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

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1990 Porsche 911 Questions

Since the power steering pump is driven off the camshaft do you have to pull the engine to replace it?

I took my 1990 C4 Cabriolet to a local repair shop for an oil change. They replaced the filter and pulled the drain plug and per the owners manual added 6.5 qts, let the engine idle and tried to add the additional 3.5. They couldn't get more than 8.5 qts total into it. At idle it was overf...

I was informed to avoid looking at 1990-91 Porsche 911's. Is there a reason?

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1990 Porsche 911 Recalls

A PART OF THE STEERING COLUMN UPPER UNIVERSAL JOINT CRACKED DURING THE MANUFACTURING PROCESS.AFTER THE ENGINE HAS BEEN TURNED OFF, THE REAR HEATER WILL AUTOMATICALLY OPERATE IN ORDER TO DISSIPATE HEAT IN THE ENGINE HEATING SYSTEM. DURING THIS OPERATION, THE RESISTOR FOR THE REAR HEATER BLOWER CAN BECOME OVERLOADED DUE TO A BINDING OR SEIZED REAR HEATER BLOWER.THE BALL SOCKETS ON THE CRUISE CONTROL LINKAGE CAN BREAK, ALLOWING THE CRUISE CONTROL LINKAGE TO BECOME DETACHED ON ONE END AND JAM ON NEARBY COMPONENTS, WHICH COULD IMPAIR THROTTLE PLATE OPERATION.

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1990 Porsche 911 Reviews

A real success story for Porsche.The 911 line up seemed to get better with each year.This is the "real" Porsche design philosophy...rear engine , air cooled.A great performer , the engine is as strong as they come.Service cost can be high.For example valves require manual adjustment , dual ignition has twelve spark plugs...every 15,000 mile service.Plus twelve quarts of synthetic oil every 7,5...

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