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Stuck valve?? Exhaust is pulling backwards

4006 Views 16 Replies 6 Participants Last post by  Chief2Horses
What all makes the exhaust suck backwards.

I have no exhaust leaks. Im figuring a stuck valve, but which side intake/exhaust?

Compression test was bad, but could it be anything else. All cylinders pumped up about the same.
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ive been told about the dollar bill "trick", albeit im not sure if theres any validity to it. tried it on my mustang and the dollar did infact suck back to the exhaust which, in theory, would suggest a partially open valve...compression test revealed nothing....hmmmmm
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