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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

 
 
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Old 11-21-2010, 10:20 AM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 22,028
Mein Auto: 02 BMW 525i M54 auto 130K
General diagnostic procedure for a single or multi-cylinder E39 intermittent misfire?

As our beloved E39s get older, more misfire threads seem to appear, where "replace this" or "replace that" is thrown out as the solution.

Rather than just throw parts at the problem, let's compile a DIAGNOSTIC procedure for debugging WHICH parts to replace to resolve the misfire.

As is my bent, I'll embarrass myself (in the next post) by creating a framework E39-misfire-diagnostic summary for others to correct. This summary will be based mostly on three of the roughly 150 posts in this intermittent cold-start single-cylinder misfire thread; so the summary needs to be fleshed out to be of general use for:

- Single-cylinder misfire diagnostic procedure (intermittent or constant, cold-start or warm)
- Multi-cylinder misfire diagnostic procedure (intermittent or constant, cold-start or warm)

PLEASE IMPROVE SO ALL BENEFIT FROM THE EFFORT!
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