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Definitely a strange problem..........couple of thoughts on it though: It seems like that since it stops when you pull the dipstick, or filler cap, it may be reducing some kind of 'pressure' that is normally released, but isn't for some reason, and the 'chirping' is caused by it release where it shouldn't????? PCV valve, crankcase vent, hose, etc.? Then again, what do I know, just guessing....
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