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Old 11-11-2012, 06:38 AM   #1
jimmy325i
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exhaust fume resonating sound

What I originally thought was tappet noise, is actually exhaust fumes resonating in the exhaust manifold. This is accordaing to a BMW specialist. And I think I belive him because I came across a 330 and heard the same sound. However, is there anyway of damping or cancelling this horrible sound out?
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Old 11-11-2012, 07:01 AM   #2
dmax
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Sometimes the exhaust mani heatshield gets loose and rattles. This is the first I've heard of someone having an issue diagnosed as such.

A tape of sound would probably help...and so would you using a stethoscope or hose as stethoscope to isolate the sound.

Try techron to clean up the fuel system...make sure you're using a proper LL-01 oil. See if that gets you anywhere. Also, some just rip off the heat shield...but I'm not so sure about that myself.

GL...hth
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Old 11-11-2012, 08:08 AM   #3
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It may be the sound you hear is a leak AT the manifold,not IN the manifold. I know from installing headers on different cars and trucks when the gasket fails it sounds like a ticking valve or lifter. IMO your head to manifold gasket has failed. It's a pretty involved job. The only ways to correct it is to diy,or pay up for gasket replacement.
Edit: definatly confirm that it is a leak before pursuing a repair.

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Old 11-11-2012, 08:13 AM   #4
Solidjake
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Also check your spark plugs for any looseness. That causes a ticking sound too.
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Old 11-11-2012, 09:13 AM   #5
jimmy325i
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not the spark plugs for definate. Gonna look in to the other possibilities. Thanks
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