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Old 08-31-2010, 10:59 AM   #4
Arty
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Join Date: Oct 2009
Location: UK
Posts: 1,030
My Ride: 1999 328i
Great thread. Also inspect that rubber pipe. If the inside of it is damaged from oxidisation where it touches the valve, it can leak, leading to blowing exhaust sound when the SAP is running at cold. It's a $10 tube, PN is 11727555680

This hose leaks



Caused by corrosion on the outside of the valve. If it's black in there (combustion residue), that valve isn't closing, and hot gasses are getting up into the SAP and damaging it. This can be cased by a sticking electrical actuator or sticking valve. The electric actuator (a solanoid) I think is wedged round the other side of the engine near the intake.

Clean it with wire wool

Replace the hose if decayed inside.

Last edited by Arty; 08-31-2010 at 11:09 AM.
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