Glow Plug light intermittantly coming on during driving?
I'm not a MB driver but my father is. I drive an Audi. He's owned a 79 240D since he bought it new, picked up in Germany. The car is all original and less than 100k on the clock. Recently he's had a few issues with it that are usually sorted out quickly with my guidance, since I'm much more of a gearhead than he is. At least, mechanically.
However, I don't know much about diesel systems, particularly on this vintage of car. He's told me that every so often while driving, the glow plug light comes on for a few seconds and then shuts off. In 36 years it's never done this. His trusted shop tells him that it could be nearly anything and they'll have to do a full diagnosis. I'd like to save him some time and maybe give him a starting point.