Hello all,
Thursday morning when I started my 300sdl I decided to do a double glow plug sequence. It was 36 degrees that morning and my car has been starting roughly all week. The first glow sequence was fine, glow light on. Second turn of the key and no glow light. I counted to 20 and started it and it started just fine. I thought perhaps the bulb in the dash burned out.
Late in the day leaving work, no glow light, started rough.
I was off Friday so I did a little diagnosis using the Factory service CD. Following the protocol, I found that the light bulb in the dash is fine, the glow plug relay is fine. I then tested the glow plugs using my ohmmeter.
Plug 1 .9 ohms
plug 2 .9 ohms
plug 3 .9 ohms
plug 4 .9 ohms
plug 5 .9 ohms
plug 6 158.6 ohms

I guessed that meant that plug 6 is bad. I took the plug out and tested it without the wiring and the ohms were 90.

Should I order one glow plug or get all 6? Does cylinder 6 routinely go thru plugs faster than the others? or is it just time to replace all 6 and start fresh?
The factory service CD is wonderful to have. The best $20.00 I ever spent.
I appreciate all input.

John

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John
1986 300sdl
1985 380se