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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 04-22-2006, 11:57 PM   #1 (permalink)
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exhaust manifold

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.

No, I am not driving it.
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Old 04-23-2006, 09:15 AM   #2 (permalink)
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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....

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Old 04-23-2006, 09:13 PM   #3 (permalink)
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thanks for the reply

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...



http://theotherwebsite.net/vids/noise.WMV
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Old 04-23-2006, 10:42 PM   #4 (permalink)
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That is an exhaust leak for sure. Check your flange gasket (where your pipe meets the manifold).
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Old 04-24-2006, 11:10 PM   #5 (permalink)
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found this lovely tonight



WTF? How don't you notice that?
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Old 04-24-2006, 11:51 PM   #6 (permalink)
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Lmao!
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Old 04-25-2006, 08:41 PM   #7 (permalink)
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Cool! I'll bet when you hit the gas, it feels like you have square tires!
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Old 04-26-2006, 12:10 AM   #8 (permalink)
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Originally Posted by Starmavin
Cool! I'll bet when you hit the gas, it feels like you have square tires!

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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