Supra (A70)

1986-1993 / Coupe / Japan

All Supra (A70) problems All workshop issues

Common Engine, 7M-GTE (Turbo)

Fan Clutch Wear

Symptoms

The engine runs hotter than normal, particularly at low speeds and idle. The cooling fan doesn't seem to pull much air through the radiator.

Cause

The viscous fan clutch uses silicone fluid that leaks out over time as the internal seals wear. Once the fluid level drops, the clutch can't engage fully and the fan freewheels.

Fix

With the engine cold, try to spin the fan by hand.

A good fan clutch should have definite resistance, you shouldn't be able to spin it easily.

If it freewheels, replace it.

Aisin or OEM Toyota units are preferred ($150-300).

Alternatively, delete the clutch fan entirely and fit a quality electric fan with a thermostatically controlled relay ($300-600 for the conversion).

Cost mentioned in fix

$150-300$300-600 for the conversion

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// More Supra (A70) problems

Other known issues

Common Engine, 7M-GTE (Turbo)

Head Gasket Failure

The head gasket blows, allowing coolant into the combustion chambers and/or oil passages. White smoke from the exhaust, coolant loss without visible external leak, overheating under boost, milky oil on the filler cap, and bubbles in the coolant overflow tank. In severe cases, hydrolock (coolant filling a cylinder and bending a connecting rod on startup).

Critical Engine, 7M-GTE (Turbo)

Low Oil Pressure at Idle

Oil pressure drops below 10 psi at hot idle. The factory oil pressure warning light may flicker or illuminate at idle, particularly in traffic on hot days. The engine may develop bearing noise (deep knocking from the bottom end).

Common Engine, 7M-GTE (Turbo)

CT-26 Turbo Failure

Loss of boost pressure, excessive oil smoke (blue/grey) on startup or deceleration, whistling or grinding noises from the turbo, and oil in the intercooler piping.

Critical Engine, 7M-GTE (Turbo)

Cooling System Inadequacy Under Boost

Coolant temperature climbs rapidly under sustained boost, particularly in traffic or on hot days. The temperature gauge sits higher than normal and doesn't recover quickly.

Critical Engine, 7M-GE (Naturally Aspirated)

Head Gasket Failure (Less Common)

Common Transmission

W58 Synchro Wear

Crunching or grinding when shifting into 2nd or 3rd gear, particularly when cold or during quick shifts. The synchros may improve slightly once the gearbox oil is warm.

View all 17 Supra (A70) problems