Posted 08-27-2017 at 16:00:14 [URL] [DELETE]
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Re: Exhaust popping
Does the "popping" correspond with engine RPM?
If so, you may have a burnt exhaust valve (could be stuck, but much less likely).
Is the power noticeably down?
Do a compression test. A dry test is adequate to identify valve problems.
If you have a single low cylinder and the "popping" corresponds with engine RPM, look for a burnt exhaust valve.