Thread: 100,000 miles
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Old 07-26-2013, 10:37 AM
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at 100,000 miles, the plugs are probably in tough shape IMO. There's likely some carbon too.
I would try it this way, simple low budget, weekend tune up. If nothing changes, then I'd look into a bit more stuff, maybe a compressino test (but unlikely these days with motors)
Definitley do a seafoam treatment. probably 2 cans IMO. then R&R the throttle body, and IAC clean those out good. swap out the plugs and clean out the rest of the air intake. change the oil after the seafoam. (mot of us wait till close to being due on an oil change anyway)

I do this in all of my vehicles that have hit that kind of mileage. I can't say I've noticed a huge power gain, but idle smoothness, part throttle response and gas mileage have all improved .
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