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New Edge Cobras
HELP BEFORE I BURN IT TO THE GROUND
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<blockquote data-quote="FIREBALL" data-source="post: 16214330" data-attributes="member: 178539"><p>Need more detail of sound and is it only coming from the middle, is it at all RPMs or just idle, is it only when cold or hot or both, and need to know what your oil pressure is at idle and 3000+rpm? Is the middle sound coming form the top or bottom or both? pressure needs to be taken with a mechanical oil pressure gauge. Last but not least and needed to be done first is a compression test. Dont think you ever said how many miles on engine?</p><p></p><p>If valve train and external noises have been ruled out, my best guess is a rod knock, piston slap, or piston pin, maybe one of the middle rods or pistons. One way to diagnose piston or rod noises is to remove each spark plug wire one at a time, if the knock quiets down or goes away (with engine running on 7 cylinders)then the unplugged cylinder is where the problem is. Also a bad piston pin will give a rapid double knock at top dead center and bottom.</p></blockquote><p></p>
[QUOTE="FIREBALL, post: 16214330, member: 178539"] Need more detail of sound and is it only coming from the middle, is it at all RPMs or just idle, is it only when cold or hot or both, and need to know what your oil pressure is at idle and 3000+rpm? Is the middle sound coming form the top or bottom or both? pressure needs to be taken with a mechanical oil pressure gauge. Last but not least and needed to be done first is a compression test. Dont think you ever said how many miles on engine? If valve train and external noises have been ruled out, my best guess is a rod knock, piston slap, or piston pin, maybe one of the middle rods or pistons. One way to diagnose piston or rod noises is to remove each spark plug wire one at a time, if the knock quiets down or goes away (with engine running on 7 cylinders)then the unplugged cylinder is where the problem is. Also a bad piston pin will give a rapid double knock at top dead center and bottom. [/QUOTE]
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HELP BEFORE I BURN IT TO THE GROUND
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