My 85 190e 2.3 runs great and is a fun car to drive, I enjoy it very much except when warmed up, The motor sounds slightly like a deisel at idle! It had a faint knocking sound. The engine runs nice and cool and has great oil pressure and pleanty of power. I do not think this noise is related to the lifters because i already know what that sounds like. I do not think it has a rod knock because the noise goes away under load or if you bring up the RPMs a little. Has anyone else had this problem? Or know what it could be?
Thanks!