Is the exhaust manifold prone to cracking in any certain spot. I bought an 85 318 and when I started it, it sounded like it had a bad rod. Then I started another car I bought, which had a bad rod. Very different sound. I am thinking either cracked manifold or stuck rings. I can't find my compression tester as of right now, so I thought I would ask about the manifold until I find it. It also seems to be running rich right now, and the inspection light is on.
The noise could be a rod knock or a wrist pin. The noise they make are both very different sounds but both are far from the sound of an exhaust leak. Not actually hearing the noise makes it nearly impossible for anyone to trouble shoot over the net....
It is definately not a rod. i have heard enough of them to know that. Wrist pin would be my thought. It is very metalic sounding. not like a rod clank though. almost sounds like there is no exhaust manifold.
here is a quick vid from my kodak, which isn't a real accurate sound but...
I'm sure it does, but I haven't had the pleasure of driving this car yet. They obviously drove it for quite some time after the damage occurred. the bolt heads are half gone as well.
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