1991 Porsche 928

Introduction

The 1991 Porsche 928 was a high-performance sports car that was praised for its handling, performance, and comfort. It was available with a 5.0-liter V8 engine that produced 325 horsepower and 332 lb-ft of torque. The 928 was available with a 4-speed automatic transmission or a 5-speed manual transmission.

Engine

5.0-liter V8

• Crankshaft Oil Leak: Oil leaks from the rear main seal. Replace the seal. $500 - $1,000+
• Cylinder Head Gasket Failure: The head gasket fails, causing coolant or oil to leak into the cylinders. Replace the head gasket. $1,500 - $2,500+
• Timing Belt Failure: The timing belt can fail, causing catastrophic engine damage. Replace the timing belt according to the manufacturer’s recommended intervals. $500 - $1,000+
• Intake Manifold Gasket Failure: The intake manifold gasket fails, causing vacuum leaks and rough running. Replace the gasket. $300 - $500+
• Valve Stem Seal Failure: The valve stem seals fail, causing the engine to smoke. Replace the valve stem seals. $500 - $1,000+

Recalls:

• 1991 Porsche 928 - NHTSA Campaign ID 91V246000 - Fuel Injection System: The fuel injection system may malfunction, causing a loss of engine power. Replace the fuel injection system.

Transmission

4-speed Automatic

• Transmission Fluid Leak: The transmission fluid can leak from the pan or lines. Replace the leaking component. $300 - $500+
• Slipping Transmission: The transmission may slip when shifting gears. Replace or rebuild the transmission. $1,500 - $3,000+
• Transmission Control Module Failure: The transmission control module can fail, causing the transmission to shift erratically. Replace the transmission control module. $500 - $1,000+

5-speed Manual

• Clutch Failure: The clutch may wear out, causing the car to be difficult to shift. Replace the clutch. $500 - $1,000+
• Synchronizer Ring Failure: The synchronizer rings may wear out, causing the transmission to grind when shifting gears. Replace the synchronizer rings. $300 - $500+

Suspension

• Front Suspension Noise: The front suspension can make noise when driving over bumps. Replace the worn suspension components. $500 - $1,000+
• Rear Suspension Sagging: The rear suspension can sag over time, causing the car to handle poorly. Replace the rear suspension springs or shocks. $500 - $1,000+

Electrical

• Alternator Failure: The alternator may fail, causing the car to lose power. Replace the alternator. $500 - $1,000+
• Battery Failure: The battery may fail, causing the car to not start. Replace the battery. $100 - $200+
• Electrical Harness Issues: The electrical harness may experience shorts or corrosion, causing electrical problems. Repair or replace the affected harness. $300 - $500+

Exterior

• Sunroof Leaks: The sunroof may leak water into the cabin. Replace the sunroof seals or drain tubes. $300 - $500+
• Cracked Windshield: The windshield may crack easily. Replace the windshield. $500 - $1,000+
• Door Handle Failure: The door handles may break or become difficult to operate. Replace the door handles. $200 - $400+

Interior

• Broken Power Seat Switch: The power seat switch may break, causing the seat to not adjust. Replace the power seat switch. $200 - $400+
• Climate Control Problems: The climate control system may not function properly. Replace the climate control module or sensors. $500 - $1,000+
• Cracked Dashboard: The dashboard may crack over time. There is no permanent repair; a dash cover can be installed. $200 - $400+

Summary

Overall, the 1991 Porsche 928 is a reliable and rewarding car to own. However, it is important to be aware of the potential issues that can arise. Many of the issues identified are relatively common for cars of this age and complexity, and can be repaired with reasonable cost.