My '83 300D idles very smoothly when started cold. After it's warmed up, it
idles roughly. After 5 or 10 miles on the highway it will sometimes sound
like a cylinder is missing. By the time I get home and crack the injector
lines, it is always idling better. I took along wrenches and cracked the
injector lines along the road when it was missing badly. I could not tell
which cylinder was worse. Each cylinder definitely began missing as I
cracked the lines.
I am wondering if the problem is most likely to be injectors, injector pump
seals, a compression problem, or something to do with injector pump
adjustment. The fact that it idles so perfectly when first started seems
strange.
Thanks,
Gerry Archer
'83 300D and 240D
