4th Gen 4Runner: Ticking or diesel-like noise on cold start

Checks, in order

1. Heat shields
   Tap the heat shields and look for loose bolts or rattles. A loose shield makes noises that mimic an exhaust leak.
   easy $ · under about $50
2. Listen cold
   Start the engine cold and listen at each side. A tick that quiets as it warms up points to a manifold crack or leaking gasket.
   easy $ · under about $50
3. Look for soot marks
   Check around the manifold flanges and studs for black soot trails. Broken studs are common.
   medium $ · under about $50
4. Valve train noise
   If the tick stays when warm, check oil level and listen for lifter or cam noise. A running tick that follows RPM is not a manifold leak.
   medium $ · under about $50
5. Replace manifold or gasket
   Replace the cracked manifold and gaskets and renew any broken studs. Expect seized hardware on older trucks.
   hard $$$ · shop-level job, $500+

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

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Go deeper

• Toyota 2UZ-FE 4.7 V8: Specs, Reliability & High Mileage Guide

The same problem on other Toyotas

• 2nd Gen Tundra (2007–2021): Ticking from the engine on cold start that fades as it warms up
• Lexus GX 470 (2003–2009): Ticking from the engine on cold start that fades as it warms

Other engine problems on the 4th Gen 4Runner

• V6 losing coolant, cold start misfire or overheating (early 4.0L)
• V8 timing belt service: when is it due?

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.