One problem related to timing tensioner has been reported for the 2003 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota 4Runner based on all problems reported for the 2003 4Runner.
When engine is cold the belts make a loud screeching noise until the car warms, then the car make a ticking sound. Truck is a v6 model and has been in for this repair 4 times, dealer says Toyota is aware of the problem and does not have the proper solution yet, they say it has to do with the belts and tensioner set up. Unacceptable response from Toyota.