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Seized Exhaust Flap

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Reamesy
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Location: Whitchurch

Seized Exhaust Flap

Post by Reamesy » Mon Jul 18, 2022 7:26 pm

I’m sure this has been done before but thought I would share.

Most people want to have the flap in the open position permanently which is fine, but on a cold start it sounds awful.

Mine was all connected but did nothing.

I first checked the actuator by attaching a vacuum pump to the rubber line disconnected first, so I could verify the electric signal and the solenoid were working which they were.

Next I tried to move the flap and it was jammed solid.

I then tried loads of PB blaster and I helped but still extremely stiff.

Next I took my MAP gas and heated the flap and it then moved freely by placing a 9mm spanner on the spindle underneath. I could then cycle it to free it off.

Next using BimmerLink I cycled the flap with the car running. Worked great until the exhaust cooled then became stiff again.

Today I took a file and took any rough edges off the flap and used emery cloth to smooth all the surfaces. Then graphite grease and working like a charm.

Most people would not be bothered I know but if it’s there I want it working. Just need to keep it maintained now😉👍
Currently; 2011 E89 23i SDrive M Sport Highline Titan Silver
Previously;
2014 SLK250CDI AMG Sport
2012 E89 SDrive 2.0 M Sport. White
2011 Audi TT Quattro
2006 Z4 2.5 Sport
2013 420D coupe
2002 Z3 2.2 Sport
1996 Z3 1.9

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