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Supra (A80)

1993-2002 / Coupe / Japan

All Supra (A80) problems All workshop issues
Common Engine, 2JZ-GTE (Twin Turbo)

Sequential Twin-Turbo System Failures

Symptoms

A flat spot or hesitation in the 3,500-4,500 RPM range during full-throttle acceleration. Boost may spike or surge unpredictably. The car feels fast below 3,500 RPM and above 5,000 RPM but stumbles in the transition zone.

Cause

The sequential twin-turbo system uses a primary turbo at low RPM and transitions to both turbos above ~4,000 RPM. This transition is managed by a complex system of vacuum-actuated valves, solenoids, and an exhaust gas control valve (EGCV). After 25+ years, these components fail: - EGCV (Exhaust Gas Control Valve): Sticks open or closed, preventing proper exhaust routing between the turbos. - Vacuum solenoids: Six solenoids control the transition sequence. Any failure disrupts the transition. - Vacuum lines: The rubber vacuum lines crack and develop leaks, causing erratic valve operation. - Pre-turbo exhaust bypass valve: Sticks, preventing the secondary turbo from receiving exhaust gas.

Fix

Diagnosis requires methodical testing of each component in the sequential system.

Replace all vacuum lines with silicone hose as a first step ($50, one afternoon).

Test each solenoid individually.

The EGCV can be cleaned or replaced ($200-400).

For a comprehensive fix, rebuild the entire sequential system with new solenoids, actuators, and gaskets ($1,000-2,500).

Alternatively, delete the sequential system entirely and run a single larger turbo.

This is a common modification that simplifies the system dramatically.

A quality single-turbo conversion using a BorgWarner or Garrett turbo with a proper manifold and tune runs $3,000-8,000 depending on the turbo size and supporting modifications.

Cost mentioned in fix
$50,$200-400$1,000-2,500$3,000-8,000

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Other known issues

Common Engine, 2JZ-GTE (Twin Turbo)

Turbo Seal Wear (High Mileage)

Blue smoke on cold startup (oil pooled in the turbo housing overnight drains into the exhaust when started). Blue smoke on deceleration (intake manifold vacuum pulls oil past the compressor seals). Oil residue in the intercooler piping. Increased oil consumption without external leaks.
Minor Engine, 2JZ-GTE (Twin Turbo)

Timing Belt Failure

Catastrophic engine damage. The 2JZ is an interference engine, if the timing belt breaks, the pistons strike the open valves, bending them and potentially damaging the pistons, head, and block. The engine stops instantly and will not restart.
Critical Engine, 2JZ-GTE (Twin Turbo)

Cam Cover Gasket Oil Leaks

Oil seeps from the edges of the cam covers (rocker covers), running down the sides of the engine. Oil smell from the engine bay. Oil drips onto the exhaust manifold (fire risk on the turbo side).
Common Engine, 2JZ-GTE (Twin Turbo)

Oil Cooler O-Ring Leak

Oil leak from the oil cooler housing on the front of the engine, typically dripping down onto the oil filter and undercarriage.
Common Engine, 2JZ-GE (Naturally Aspirated)

VVTi Solenoid Issues (Later Models)

Rough idle, loss of mid-range torque, check engine light. Fault codes related to Variable Valve Timing.
Common Transmission

V160 Getrag Synchro Wear

Crunching or grinding when shifting into 2nd or 3rd gear, particularly during quick downshifts when cold. The synchros may improve once the gearbox oil warms up.
View all 17 Supra (A80) problems