1990 Porsche 928

Introduction to the 1990 Porsche 928

The 1990 Porsche 928 is a luxurious sports car known for its high performance and grand touring capabilities. It was offered with two engine options: a 5.0L V8 and a 5.4L V8, both paired with either a 4-speed automatic or 5-speed manual transmission. With a sleek and sporty exterior, spacious and comfortable interior, and powerful engine, the 928 was highly praised by enthusiasts. However, like any vehicle, it had its fair share of issues that owners should be aware of.

Engine

• 5.0L V8
  • Timing Belt Failure:
    • Description/Symptoms: The timing belt can fail due to wear or other factors, leading to catastrophic engine damage. Symptoms include sudden loss of power, loud noises from the engine, and illumination of the Check Engine light.
    • Solution: Replace the timing belt and associated components.
    • Estimated Cost to Fix: $1,500 - $2,500+
    • Recalls: None Found
• 5.4L V8
  • Valve Guide Wear:
    • Description/Symptoms: Excessive wear on valve guides can occur, causing a loss of compression, increased oil consumption, and rough engine idle. Symptoms may include blue smoke from the exhaust, increased engine noise, and reduced power output.
    • Solution: Replace affected valve guides and associated components.
    • Estimated Cost to Fix: $2,000 - $4,000+
    • Recalls: None Found

Transmission

• 4-Speed Automatic
  • Shift Solenoid Failure:
    • Description/Symptoms: Faulty shift solenoids can lead to erratic shifting patterns, delayed shifts, and a lack of response from the transmission.
    • Solution: Replace the affected shift solenoid(s).
    • Estimated Cost to Fix: $500 - $1,200+
    • Recalls: None Found
• 5-Speed Manual
  • Worn Synchronizers:
    • Description/Symptoms: Worn synchronizers make it difficult or impossible to engage certain gears, resulting in grinding noises and a lack of smoothness during shifting.
    • Solution: Replace the affected synchronizer(s).
    • Estimated Cost to Fix: $1,000 - $2,000+
    • Recalls: None Found

Suspension

• Rear Trailing Arm Bushings:
  • Description/Symptoms: Worn or damaged rear trailing arm bushings can cause excessive play and instability in the rear suspension, leading to poor handling and reduced tire life. Symptoms may include a clunking or rattling noise from the rear, uneven tire wear, and a lack of directional stability.
  • Solution: Replace the affected bushings.
  • Estimated Cost to Fix: $500 - $800+
  • Recalls: None Found

Electrical

• Alternator Failure:
  • Description/Symptoms: The alternator can fail due to various reasons, leading to insufficient electrical power for the vehicle’s systems. Symptoms may include a dim or flickering dashboard, headlights, and malfunctioning electrical components.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found
• Battery Drain:
  • Description/Symptoms: A battery drain can occur due to a component or system that is drawing excessive power. Symptoms may include a dead battery, difficulty starting the vehicle, and rapid battery discharge.
  • Solution: Inspect the electrical system for any potential sources of parasitic drain.
  • Estimated Cost to Fix: Varies depending on the cause
  • Recalls: None Found

Exterior

• Sunroof Leaks:
  • Description/Symptoms: The sunroof assembly can develop leaks, allowing water to enter the interior of the vehicle. Symptoms may include water stains on the headliner, dampness around the sunroof opening, and potential electrical issues due to water damage.
  • Solution: Repair or replace the sunroof seal or other affected components.
  • Estimated Cost to Fix: $500 - $1,200+
  • Recalls: None Found

Interior

• Instrument Cluster Failure:
  • Description/Symptoms: The instrument cluster may fail due to electrical faults or other issues, resulting in malfunctioning gauges and displays. Symptoms may include dim or flickering gauges, incorrect readings, or a complete loss of functionality.
  • Solution: Replace or repair the instrument cluster.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Summary

The 1990 Porsche 928 is a powerful and luxurious sports car, but it is not immune to potential issues. Engine problems, such as timing belt failure and valve guide wear, are serious concerns that require significant repairs. Transmission issues, including shift solenoid failure and worn synchronizers, can compromise the smoothness and reliability of the vehicle. Suspension problems, such as worn trailing arm bushings, can affect handling and tire life. Electrical issues, such as alternator failure and battery drain, can cause a range of problems, from inconvenience to potential safety hazards. Exterior and interior issues, such as sunroof leaks and instrument cluster failure, may not be as severe but can still be costly to repair. Overall, potential owners should be aware of these common issues and consider the associated repair costs before purchasing a 1990 Porsche 928.