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My thought was that defective components that influence the ECU's estimation of fuel-air ratio could possibly cause the engine to run rich enough to let unburned fuel slip by the piston rings.


Yeah, the MAF can freak out and throw things off; I was getting some misfire codes; turned out my EGR was carboned up; not uncommon on a 2.7L Yota. If your dipstick smells like fuel later on, change your oil/filter, do some driving, and see how it smells after that, since you've fixed your air leak.

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