Checks, in order
- Read codesSee the code-reading steps in 'Cranks fine but won't fire'. Codes narrow the search fast.easy $ · under about $50
- Vacuum leaksInspect PCV and vacuum hoses for cracks. Listen for hissing at idle; a smoke test finds the hidden ones.easy $ · under about $50
- Ignition tune-upPlugs, wires, cap and rotor. Old wires and a cracked cap cause misfires under load and in wet weather.easy $$ · about $50 to $500
- Throttle body and idle controlClean carbon from the throttle body and idle air passages with throttle body cleaner. Check the idle speed against spec afterwards.medium $ · under about $50
- Oxygen sensorsOriginal O2 sensors on these trucks are long past their service life and cost fuel economy quietly. Check readings with a scan tool on OBD-II trucks.medium $$ · about $50 to $500
Applies to: FZJ80 (1993–1997 US, 1FZ-FE), Lexus LX 450 (1996–1997), FJ80 (1991–1992 US, 3F-E). Engine checks assume the 1FZ-FE unless noted.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| Test lead and jumper wire kit | Bridging the diagnostic connector to read flash codes | Shop on Amazon |
| Ignition coil | Swapping a suspect coil after the misfire follows it | Shop on Amazon |
| Spark plugs | Replacing worn plugs at the factory interval | Shop on Amazon |
| Digital tire pressure gauge | Checking pressures, the most common mileage thief | Shop on Amazon |
Go deeper
Other fuel & ignition problems on the 80 Series Land Cruiser
More 80 Series Land Cruiser problems
- Temperature climbs when towing, climbing or on hot days (Cooling)
- White smoke, sweet smell or coolant disappearing (Engine)
- Turn the key: click or nothing, engine won't crank (Starting & Charging)
- Clunk on takeoff or vibration that grows with speed (Drivetrain)
- Clicking or grinding when turning, grease on the inside of the wheel (Front Axle)
- Wandering, loose steering or front-end shimmy (Steering & Suspension)
All 14 80 Series Land Cruiser symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.