I copied and pasted this from another 4 runner forum:

Toyota 4runner spark plug replacement interval. There are two types of spark plugs: Plus, take advantage of our. More often than not, your engines computer will be able to detect bad spark plugs in your.

I'm coming up on my 3rd spark plug change with the 4runner later this summer and i'm debating. Press up on the level to release the safety catch. The replacement of the spark plugs themselves.

The check engine light is one of the most common symptoms of bad spark plugs. While most toyota experts in the cincinnati area will recommend having your spark plugs replaced every 30,000 miles, it will vary based on your specific model. The grommet was so hard and brittle.

Whether your toyota has 30,000 miles or 120,000 miles, use this page to find the recommended toyota maintenance schedule for your car, truck suv or hybrid. Yup, and if you are a visual guy, here is a quick youtube vid on 3.4l 4runner spark plug replacement : They will not need replacement until 120.

Pull up on the hood release latch found under your steering wheel. The standard spark plugs in the 2004 4runner v8 are 120k iridium plugs.