Checks, in order
- Throttle body and idle air controlRemove the intake tube and clean the throttle body and idle air control valve with throttle body cleaner. Surging at idle or stalling when the A/C kicks on is the classic sign.easy $ · under about $50
- Vacuum leaksInspect the intake hoses, PCV hose and brake booster line for cracks. A leak can also set a lean code.easy $ · under about $50
- Plugs, wires and distributor capOld plugs and cracked wires cause a misfire under load. Replace them with the correct heat range as a set.easy $ · under about $50
- Mass air flow sensorClean the sensor element with MAF cleaner only. Do not touch the wire with anything.easy $ · under about $50
- EGR and PCVA clogged EGR passage or stuck PCV valve can roughen the idle. Clean or replace the valve.medium $$ · about $50 to $500
Applies to: 1996 to 2002 4Runner with the 2.7L 3RZ-FE four-cylinder and the 3.4L 5VZ-FE V6, 2WD and 4WD, manual and automatic. Where a check only applies to one engine it says so.
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 |
|---|---|---|
| Bluetooth OBD2 scanner with live data | Reading and clearing codes and watching live sensor data | 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 |
Other fuel & ignition problems on the 3rd Gen 4Runner
More 3rd Gen 4Runner problems
- Clunk, knock or loose feel in the front end over bumps (Steering & Suspension)
- Shimmy, vibration or steering wander at highway speed (Steering & Suspension)
- Frame rust, rotten rocker panels or rusty underbody (Frame & Body)
- Engine overheating or temperature gauge climbing (Cooling)
- Pink or milky transmission fluid, or coolant in the transmission (Transmission)
- 5VZ-FE timing belt service: when is it due and how do I tell? (Engine)
All 16 3rd 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.