Vehicles using 7M-GE engine list:

Engine 7M-GE

Symptoms:
- Rough idling or stalling
- Loss of power or hesitation during acceleration
- Engine misfires or backfires
- Overheating or coolant leaks
- Excessive oil consumption or smoke from exhaust

Diagnosis:
- Check ignition components (spark plugs, wires, distributor cap, rotor) for wear or damage
- Inspect fuel injectors and fuel pressure for proper operation
- Test the timing belt for wear or incorrect tension; a worn belt can cause timing issues
- Examine the cooling system, including radiator, hoses, and thermostat for leaks or blockages
- Look for oil leaks around valve cover gasket and seals
- Perform a compression test to assess cylinder health

Fixes:
- Replace worn spark plugs, ignition wires, distributor cap, and rotor to restore proper ignition
- Clean or replace fuel injectors; ensure fuel pressure regulator is functioning correctly
- Replace timing belt every 60,000 to 90,000 km (37,000 to 56,000 miles) to prevent failure
- Repair or replace faulty cooling system components; flush coolant regularly
- Replace valve cover gasket and seals if oil leaks are detected
- Address any compression issues by repairing or replacing damaged valves, piston rings, or head gasket

Prevention:
- Follow regular maintenance schedule, including timely oil changes and coolant flushes
- Replace timing belt and water pump as recommended to avoid catastrophic engine damage
- Use quality fuel and ignition components to ensure smooth engine operation
- Monitor engine temperature and address overheating immediately
- Keep the engine bay clean to spot leaks or issues early

By adhering to these guidelines, owners of the Toyota Supra 3.0i with the 7M-GE engine can maintain reliable performance and extend engine life.