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Q: WHen does a PCV valve go bad? How can you tell? on 2002 Mazda B2300

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Years ago I broke off porcelain from the spark plug which fell into the engine. Uses oil ever since. Now it is running roughly, at 72000 miles.
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have a compression test done on that cylinder. have them do a wet and dry to see if there is ring damage. the damage may be surfacing now from that action.

Roy
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