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300ZX (Z32)

1989-2000 / Coupe / Convertible / Japan

All 300ZX (Z32) problems All workshop issues
Common Suspension and Steering

HICAS Failure

Symptoms

HICAS warning light on the dashboard. Strange rear-end behaviour at low speeds (parking manoeuvres). The rear wheels may track incorrectly.

Cause

The HICAS (High Capacity Actively Controlled Steering) system uses hydraulic actuators, electronic sensors, and a separate power steering pump to steer the rear wheels. After 30+ years, the actuators leak, the sensors drift, and the system no longer functions correctly.

Fix

  1. 1 Two options. Repair the HICAS system (expensive, parts increasingly scarce, $500--1,500+). Or delete it entirely with HICAS lock-out bars ($100--200), which convert the rear to conventional fixed steering. Most Z32 enthusiasts recommend deletion -
  2. 2 it simplifies the car, reduces maintenance, and many drivers prefer the handling with HICAS removed
Cost mentioned in fix
$500$100

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// More 300ZX (Z32) problems

Other known issues

Common Suspension and Steering

Bushing Deterioration

Clunking, knocking, and general looseness in the suspension. Vague steering response. Uneven tyre wear. The car feels imprecise and wallowy.
Minor Engine -- VG30DE/DETT (All Models)

Timing Belt Failure Risk

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.
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.
View all 15 300ZX (Z32) problems