Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - slight humming noise at idle and knocking? noise on slow acceleration
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Old 05-26-2011, 10:25 PM
zoomo zoomo is offline
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so this knocking noise is still driving me crazy, although i've been trying not to let it do it. Still hoping it's nothing serious. Anyway, i've gathered more details now. it seems that once the engine reaches operating temp that the noise all but goes away, it's so faint that i may be just imagining it. but when the engine is cold at take off it is loudest, though even then it isn't really noticeable to anyone unless you really listen closely. next thing i found tonight was listening, with the truck in gear in the drive the noise is loudest at the number seven header pipe. only the pipe, if i listen at the head or around the header flange i can't even hear the noise, also i've listening at the bottom end all over the block, at the rear main seal, oil pan, nothing. the noise is definetly loudest at that one header pipe. any ideas guys?
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