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Old 06-19-2012, 10:04 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 23,178
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by timarnold View Post
The blue twist plug is a cover plug that is removed to insert the flywheel lock to lock the engine at TDC when setting the VANOS timing.
Thanks. It's clearly a twist plug that's a bit hard to get to ... so it must not often be accessed.

As for the prior pictures above, I think I previously mislabeled the picture reproduced below:

Looking it up, I find the large opening is actually the "throttle body" (TB, PN 13547502444) ...

While the smaller opening is the wholly separate T-shaped idle control valve (ICV, PN 13411744713) ...

What confuses me is that these must both be closely associated, yet, in the realoem diagrams, they're not even close in system classification.
Q: Why do they put these two obviously (very) closely related components in (wholly) separate classifications systems?

Note: I unknowingly manually moved the throttle body plate to clean it (with the engine off) - but - apparently I should NOT have done so based on this thread.
Originally Posted by POof540i View Post
Do not, I repeat, DO NOT! Manually move the throttle plate with your hands. Because it is a drive-by-wire, any movement you induce can permanently damage the throttle body. Ask me how I know.
Note: Picture reproduced from this thread: E39 (1997 - 2003) > E39 how to clean throttle body
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 06-19-2012 at 10:41 PM.
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