I went out to start my car a few mornings ago and it(1980 300cd)wouldn't start. It cranks but wont fire. I checed the fuse in the black box on the inner fender(glow plug relay or startin unit i think it's called)it was fine. That fuse went out on me one time and I had the same result.(cranks but won't fire)I'm trying to get the same glow plugs that were in it.(pin type large thead) but I'll have to wait until the dealer opens on Monday. If the new glow plugs don't fix it, Do you have any idea of another cause? I would appreciate any help. p.s. My car was a 1980 model built in late '79
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Originally posted by 123 300D driver:
I replaced my series glow plugs with the parallel style a couple of winters ago. I got them from George_Murphy@compuserve.com. They cost the same as the serial ones. They fit right in to the existing large threads. No difficult rewiring necessary. I think Mercedes switched to parallels part way through the '79 model year. That's why the newer ones start better. With the parallel plugs in summer (cold engine) you have to glow for 4 sec. In winter, for 10 sec. In my case, they work fine down to -20C or -5F without preheating the engine. I can't think of any reason not to switch unless you want to keep your car original.
Gary