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Re: Plenum Discoloration (archive)
[ Follow Ups ] [ 8-series (E31) Message Board ] [ Msg. Board FAQ ]
Posted by Frissen on February 07, 2000 at 17:02:30:

In Reply to: Plenum Discoloration posted by Len Cacioppo on February 07, 2000 at 12:24:11:

: Need some advise. When I picked up my 850 CSi on Jan. 20th, I noticed the plenum was a little discolored (kind of a golden haze) towards the front of the engine (by the throttle bodies). As of yesterday (and some VERY hard driving) the golden color has spread out to cover the entire plenum (although not as pronounced as the front, which has gotten worse). I have had the car washed several times at one of those professional places, but I know that they didn’t open the hood.

: Any ideas as to what could be causing this?? Should I be worried?

: Thanks in advance!!


The CSi has black intake manifold right? I thought only the i/Ci had the silver ones that turned yellowish. You may want to try Extrude Hone, or Dinan for black powder ones. Once I saw a picture of an MKRacing polished manifold that looked pretty good.

I have the same predicament but my car is Ci.

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