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Loud secondary air pump

30153 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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Thanks DHoang,

Good idea on soaking the airvalve :thumbup:. I may try that tonight.

I would replace the air valve in a heart beat if I know for sure it will solve my chu chu train noise problem. The last time I checked for price was 110 buckaroos, that's a lot of money to throw away.

Don't worry I won't go the brake booster route.
I will probably go via the air valve inlet.
Even if it doesn't fix your problem, consider valve replacement as preventive maintenance. They can and do fail. I had one fail at around 35k miles under warranty. When I hit 120k I went ahead and had a new one installed.

Interesting about your results with Seafoam. It is supposed to reduce intake deposits on valves and such. I run a can of Lubro Moly "Ventil Sauber" in my gas tank every 5k miles or so. When I had my valley pan gaskets replaced the tech said my intake system and the ports into the intake valves looked really good.
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