I finally replaced the secondary air pump. It was very loud at cold start and I figured it would not last long.
There is a good write up on e38.org on how to replace the secondary air pump. A few supplemental notes though. I had no trouble disconnecting the connectors from the parking sensors, you must squeeze the connector to free it, they came right off. Careful when removing the nuts from the attachment frame that holds the secondary air pump. There are three rubber mounts that have bolts out each end and when the nut is turned, the rubber mount can twist in two. The way to remove the nut is to hold the metal at the end of the rubber mount with a pliers while loosening the nut.
I replaced the secondary pump valve also just to be thorough. I had an engine code P1423 and figured that the valve may be the culprit.
2nd Air Pump.jpg2nd Air Pump Valve.jpg
2001 BMW 740i - Anthracite Gray - Style 32 Wheels --------- 2004 BMW 330i - Silver Grey Metallic
Convenience Pkg - Cold Weather Pkg - PDC ------------------- Sport Package - Auto - Mroof - Hseats
Did your codes go away? I have a noisy air pump as well, but I've already replaced the valve and I still get the code.
Current
95 e31 840 Ci (Auto) Orient Blue 61k
11 e90 328i Space Gray
18 F15 X5 35i XDrive White
Past
00 e38 740 i (Auto) Titanium Silver
94 e31 840 Ci (6 speed conv.) Avus Blau (This car was Awesome!)
03 e46 325 Ci (Auto) Jet Black
91 e31 850i (Auto) Diamond Black, Yes, two!
91 e31 850i (Auto) Diamond Black
00 e39 528i (Auto) Jet Black
92 e36 325i (Auto) Laguna Green
2001 BMW 740i - Anthracite Gray - Style 32 Wheels --------- 2004 BMW 330i - Silver Grey Metallic
Convenience Pkg - Cold Weather Pkg - PDC ------------------- Sport Package - Auto - Mroof - Hseats
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