My 97-528 SAP is kind of loud compares to my 02-530.
It's a fast loud thumping sound.
I think the air passage may have been clogged, but then again this maybe normal for 528.
How's every 528 SAP sound in the morning? Thanks for the feed back.
FYI, the BMW TIS recommends that whenever you suspect a bad air valve, the following in that circuit needs to be replaced to avoid further troubleshooting:
1. Air Valve (average life is 100-120K)
2. Vacuum hose to Air Valve and to the Electric Valve.
3. Electric Valve (under Intake Manifold), here is a pic of the Electric Valve:
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