I've got a 91 940se turbo that will not run. It cranks over ok. The spark plugs are wet, and it has low compression.
1=80, 2=75, 3=80, 4=80. I tried oiling the cylinders, but the compression did not rise at all. New plugs just wet. I got a code 312 but I dont believe its related. I think its washed the cyinder walls down and ruint the rings. [&o]

Anyone have any suggestions. Any help is appreciated.
Thanks, Tim.

 

You might have something wrong with the valves if oiling would bring the pressure up.
Oiling seals the rings to raise compression.