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Old 07-04-2012, 02:32 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by bluebee View Post
I'm still tracking down a random error misfire sequence:
- Does the order of the misfire OBDII DTCs diagnostic trouble codes actually matter (1)
I just re-ran into this thread trying to help out on another E39 misfire thread, when I realized I had not done the obligatory update after resolving the problem.

It took almost a year to find the cause of the lean-condition random misfire - but I finally found it by running a smoke test.
- How to make your own smoke machine (1)

a) Various vacuum hoses were worn & torn (all were replaced)
b) The CCV (lower) vent hose was leaking badly (and the dipstick guide tube was clogged solid!)
c) The corrugated "thumb" of the boot at the ICV & TCV was cracked

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Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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