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Loud secondary air pump

30133 Views 65 Replies 12 Participants Last post by  vaboxr
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.
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fudman, do you think this SAS could be impacted by carbon deposits? I saw the m5 engine photos and wondered if the system on these i6 engines could have the same problems? Or if carbon deposits or clogging could kill the valve and pump.
Here is my check valve @ +/- 90 k miles

yes, it had heavy carbon depositis.
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