"Bruce in Bangkok" wrote:

read a reference to one of your posts, quoted in part by Roger, that
sounded as though the RPM was only unstable at low RPM, I remember
something about 1,000 RPM.


Most diesels need to idle in the 1300-1500 RPM area in order to
generate enough waste heat to prevent
"wet-stacking" which will cause glazing of the cylinder walls,
creating a VERY expensive repair.

Lew