I just changed the spark plugs for the first time in like 175, 000 miles
OEM Toyota plugs will probably last forever but it depends if your gas mileage is like 5 to 10 miles less that's the only way I would change the back plugs.
Spark plugs 100k miles - $25
So I decided to I replaced my spark plugs. There was a ton of carbon build up in the first cylinder, and oil on the 2nd, 3rd and 4th spark cylinders, including the spark plugs. It’s running way smoother now but there is still some jerking but it’s not as violent as before.
I have an 02 4runner with 289,500 miles. I've had it for the last 106,000. Replaced the timing belt/ water pump twice. Replaced spark plugs twice. New brakes a few times.
Unfortunately no--replace them. The electrodes wear down and become less efficient. The good news is that iridium plugs have a tremendous lifespan. You're supposed to change them every 100k miles/167k km.
O drove my Corolla to the point the spark plugs weren't firing and the car wouldn't start. I changed the plugs and it ran great after that.
Maintenance: 39th Oil Change (every 10K) and Tire Rotation, 13th Engine Air Filter, 13th Cabin Air Filter, 3 brake jobs, 3 coolant flushes, 2 spark plug changes w/carbon cleaning, no suspension work, no transmission service, 1 Break Down at 280K Due to a Design Flaw In The MGR Cable Which Powers The Hybrid System $5200, cat issue at 380K due to bad gas, no hybrid battery replacements in case you were wondering, does not consume oil
UPDATE: owners manual calls for replacement around 120k so I'm not that far behind i guess. Still went out and bought 4 new plugs and installed them. $80 at the dealer
Noticed before the LTFT was -6% and now its back to 0%.
Bought a 03 100 series with 241,000 only issue was the number 7 spark plug blew out, had to re-tap it and install a aluminum sleeve, and replace the coil
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