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.
Before you do that seafoam madness, try removing the valve, and let it soak in WD-40 overnight. If the valve is partially sticking mechanically, this soaking will free things up.
If the valve isn't opening up due to other issues, like a diaphragm malfunction, then most likely a replacement is what's needed. :dunno:
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