Thread: Glow plug light dos not come on and 97 E300d wont start why?
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Old 06-29-2011, 08:37 PM
TMAllison TMAllison is offline
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
The PCB in the relay gets minute cracks in the circut pathways from continous exposure to heat. Causes lots of intermittent type electrical problems as it expands and contracts and current is interrupted. Most common K40 fault is the SOV closing while driving causing the engine to shut down instantly. Loss of power also prevents codes from registering in the ECU.

I'd guess most of them don't last for longer than 5-8 years typcially.

Some folks claim they can see the cracks with a good magnifying glass.

Something to keep in mind if you cant find something else causing the problem.
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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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