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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 10-17-2010, 06:06 PM   #1 (permalink)
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Question HELP, Bad Compression/Good Leak Down

2000 323i

I have a misfire on cylinder six (6) and a ticking noise under the hood. Doesn't sound like rod noise. Ran a compression test and cyl. six (6) failed. It is only 90 psi while the other five are 190 psi. Ran a leak down test and it passed. Only 4% and only crankcase noise. No evidence of leaking valves. I can't figure out what would present these two symptoms at the same time.

Anyone got any ideas?
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Old 10-18-2010, 08:18 PM   #2 (permalink)
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Well I think I got the answer.

Using a depth gauge and measuring TDC on several cylinders #6 is 8.23mm lower in the cylinder than the rest. Sooooo......It's got a bent rod or broken wrist pin on something that is leaving it lower in the cylinder and thus the lower compression with a good leak down test.

It's the worst news I could get. Now do I rebuild the motor or is there a good source for a short block?
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Old 10-18-2010, 08:58 PM   #3 (permalink)
OMFG another one!?
 
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