(x-post) Glow plug light intermittently coming on while 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.
It would not make sense to spend money on that unless it could be verified.It is one of those I can't fix it if it is not broken.To look into it, the possibilities are not that great, the glow control itself,the ignition switch would be suspect, watching it until it happens is the only way.If the ign. switch 15 circuit was to break then make the circuit Could cause that, otherwise the glow control under the dash may be most likely.If it came to my shop I would not go beyond this story, taking money under this circumstance would be theft, it is Very unlikely to find the cause.I have seen this a long time ago, it was the control falsely turning itself on. I would check to see if that part is still available.
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