Checks, in order
- Confirm the engineCheck the VIN or the badges. The V6 uses a chain and does not need a belt. Only the V8 does.easy $ · under about $50
- Look for service recordsFind an invoice that lists belt, tensioner, idlers and water pump. If no proof, treat the truck as overdue and budget for it.easy $ · under about $50
- Replace as a kitDo the belt, water pump, tensioner and idler pulleys together, plus the front seals if they weep. The labor overlaps so doing it all at once saves money.hard $$ · about $50 to $500
- Check for leaks at the frontOil or coolant around the timing cover area is a sign to deal with it at the same time. Oil on the belt shortens its life.medium $ · under about $50
Applies to: 2003 to 2009 4Runner with the 4.0L 1GR-FE V6 and the 4.7L 2UZ-FE V8, 2WD and 4WD. Engine specific items are labeled, and some issues apply mainly to early model years.
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 |
|---|---|---|
| Timing belt kit with water pump | Doing the belt, pump, tensioner and idlers together | Shop on Amazon |
| Bluetooth OBD2 scanner with live data | Reading and clearing codes and watching live sensor data | Shop on Amazon |
Go deeper
Other engine problems on the 4th Gen 4Runner
- V6 losing coolant, cold start misfire or overheating (early 4.0L)
- Ticking or diesel-like noise on cold start
More 4th Gen 4Runner problems
- Frame rust or rusted suspension mounts (Frame & Body)
- Clunk, knock or wandering from the front suspension (Steering & Suspension)
- Sticky, melting or cracked dashboard (Body & Electrical)
- Engine overheating or temperature gauge climbing (Cooling)
- Pink or milky transmission fluid, coolant in the transmission (Transmission)
- Turn the key: click or nothing, engine won't crank (Starting & Charging)
All 16 4th Gen 4Runner 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.