Date registered: Jun 2008
Vehicle: 1991 350SDL
Location: Springfield VA
Mentioned: 1 Post(s)
Quoted: 147 Post(s)
ASR is quite different from ASD
ASD just locks the differential, the system has 3 speed sensors just like the "normal" W126's ABS.
Can you take a picture of the unit you're seeing the thump from?
Because it occurs when you are stopped I would think it's something with the ASD as well. Has it always done this?
I have a friend who has a 300D 2.5 with ASD, I'll ask him if he hears the unit cycling on his car.
1991 350SDL Turbo. 230,000 miles (new engine at 150,000).
2013 Fiat 500e. 10,000 miles.
2012 Passat TDI DSG. 110,000 miles.
2004 Touareg V10 TDI. 160,000 miles.
1999.5 Jetta TDI. GLX equipment swap. Turbo, 11mm pump, tune, etc. 310,000 miles.
1991, 1992 Jetta ECOdiesels. 430,000, 130,000. Gone and missed.