300ZX (Z32)

1989-2000 / Coupe / Convertible / Japan

All 300ZX (Z32) problems All workshop issues

Minor Engine -- VG30DE/DETT (All Models)

Timing Belt Failure Risk

Symptoms

If the timing belt breaks, the valves collide with the pistons. The engine is destroyed. There is no warning -- the belt simply snaps and the engine stops instantly with catastrophic internal damage.

Cause

The VG30 is an interference engine with a rubber timing belt that deteriorates with age and mileage. Nissan specified 100,000 km intervals, but many specialists recommend 80,000 km or 5 years, whichever comes first. Heat, oil contamination, and age degrade the belt regardless of mileage.

Fix

Replace the timing belt, tensioner, idler pulleys, and water pump as a set.

This is the Z32's most important scheduled maintenance item.

Cost: $1,500--3,000 due to the extensive labour required to access the belt.

The job typically takes 6--10 hours.

Cost mentioned in fix

Cost: $1,500

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// More 300ZX (Z32) problems

Other known issues

Common Engine -- VG30DE/DETT (All Models)

Spark Plug Access (Rear Bank)

The rear three spark plugs become fouled, worn, or fail, causing misfires, rough running, and reduced power.

Critical Engine -- VG30DE/DETT (All Models)

Oil Leaks

Oil seepage and dripping from multiple points -- valve cover gaskets, rear main seal, oil pan gasket, timing cover, turbo oil lines (TT), power steering lines, and various sensors.

Minor Engine -- VG30DE/DETT (All Models)

Overheating

Temperature gauge climbs, particularly in traffic or on hot days. Coolant loss. Steam from under the bonnet.

Common Twin-Turbo System (VG30DETT Only)

Vacuum Line Deterioration

Boost fluctuations, poor throttle response, check engine light, erratic idle, boost creep (boost exceeding target), or inability to make boost.

Critical Twin-Turbo System (VG30DETT Only)

Turbocharger Wear

Excessive turbo whine, metallic grinding or rattling from the turbos, blue smoke under boost (oil passing through worn seals), or reduced boost pressure.

Critical Twin-Turbo System (VG30DETT Only)

Power Steering Line Fire Risk

Power steering fluid leaks onto the hot exhaust manifold or turbo housing. In extreme cases, the fluid ignites.

View all 15 300ZX (Z32) problems