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1988 Porsche 928 S4 -Extensive Mech. Resto.-Strong Running Condition - $15,000 (Highland Park)
1988
Porsche 928 S4
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Offered for sale is a 1988 Porsche 928 S4 — a well-preserved, un-rusted example of Porsche’s legendary grand tourer. This car has been carefully and extensively restored mechanically over the past four years, making it an exceptionally strong and reliable driver.
While the paint has faded and the air conditioning is currently inoperative, under the hood and beneath the body nearly every major system has been addressed. If you’re looking for a mechanically sorted 928 that can be driven and enjoyed now — with cosmetic finishing left to your taste — this is a fantastic candidate.
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Mechanical Restoration Highlights
Purchased July 2020 – $14,000
• Strong daily driver, solid body with no rust.
July 2020 – Joe Anselmo Motorsports – $5,169
• Electrical system refresh: switches, dash lights, fuses, resolved parasitic draw.
• Intake manifold removed, cleaned, and powder-coated.
• Overhaul of breathing and fuel lines with new Bosch injectors.
• New battery installed.
September 2020 – House Auto Group – $1,200
• New engine timing belts.
November 2020 – Major Service – $18,880
• Transmission flexplate repair.
• Oil pan reseal and leak resolution.
• New front and rear shocks.
• New engine sensors and wiring harnesses.
• Breathing and exhaust lines adjusted/fixed.
• New engine mounts.
• Head gasket repair.
• Fuel line and throttle valve completion.
• New Pirelli P Zero Rosso tires (front & rear).
March 2022 – Performance Motorwerks – $31,344
• Complete engine rebuild:
• Engine gasket set, valve work.
• New main and rod bearings.
• Re-ground cams (kissed, not welded).
• Cam gear recoating.
• Idle control valve, custom fuel damper.
• Custom torque tube shaft.
• New water pump, radiator hoses, and water lines.
• Much more (full details on invoice).
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Condition Summary
• Mechanical: Thoroughly restored, drives beautifully, reliable.
• Body: Solid, rust-free chassis; straight panels.
• Cosmetics: Paint is faded and would benefit from refinishing.
• Interior: Presentable, with typical age-related wear.
• A/C: Non-functional at present.
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Why Buy This 928 S4?
This car has received over $55,000 in documented mechanical work since 2020, including a full engine rebuild. The difficult, expensive work has already been done — leaving only cosmetics and comfort items for the next owner to finish.
For the enthusiast who values a strong mechanical foundation, this Porsche 928 S4 represents an opportunity to own and enjoy one of the most iconic V8 grand tourers of the 1980s at a fraction of the cost of a concours-level example.