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Old 04-27-2002, 07:09 PM
Mr.W123
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Help, glowplugs dead after 4 months!

I replaced all 5 of the glowplugs on my 300D in December and now I have the same no light no start problem. I checked the resistence of each plug (from the 6 slot connector to ground, on the 200 scale) and glowplug 1 and 3 show 1.5-2.4 and 1.3-2.8 . But glowplugs #'s 1,4, and 5 show 0.00 ! They should show either a low number(if good) or infinity (if bad). Glowplugs are really just resisters that produce lots of heat so they should have a high resistence like 1.5 on the 200 scale = 300 ohms. Zero makes no sense at all to me. Is there a short somewhere or inside the glowplugs themselves?

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Old 04-27-2002, 07:17 PM
roadracer
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I had three glow plugs go bad after about a year. I tested them from the terminal and then tested them right at the plugs. I got a reading of infinity on 4 and 5 and a reading of something other that 1 on numbe 3. After talking with a trusted MB tech in the area he told me that there was a bad batch of, if I remember correctly, Monark Diesel glow plugs produced last year. This was news to me. Anyway, I bought 5 new Bosch plugs and installed them. No problems after that. I must note too, that I couldn't understand why my car wouldn't start even with the "new" plugs that I installed last year. My tech suggested testing the plugs and thats when I found the bad ones. I've learned now, if there is a no start situation, always check the plugs first. It will save you headachs.
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Old 04-27-2002, 11:39 PM
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It is possible that the glowplugs were incorrect for your engine and the heat killed them. May even be a power problem, too much power would, in theory, burn 'em up as well. Or could just have been a bad batch of glow plugs. I had dead glow plugs and didn't know it. I didn't ask why they died, I assume they were just old. Starts up beautifully now.
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Old 04-29-2002, 10:43 AM
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The plugs should have a resistance of .75 - 1.5 Ohms.

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