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Old 10-13-2007, 06:41 PM
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Join Date: Aug 2007
Posts: 4
84 300D won't start

i read a quote in the boards here there is nothing more expensive than a cheap mercedes. please help prove 'em wrong.

here is my story...326k miles. i just lovingly poured $1k+ on new fluids and some drive shaft stuff. she still vibrates on acceleration--mechanic said motor mounts, but i'm out of $ to fix. so im living with her querks.

then she stopped starting. she started slow a few times, and now not at all. i got a strong battery. i figure its glow plugs or the power source to them. but i am usually wrong when i try to guess what is bugging her. i cant hear the glow charge buzz (that thing on the left front wheel well) anymore. could it just be a fuse? if yes, where is the fuse?

any help is appreciated. im in over my head. she keeps wanting more.
thanks in advance.
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Old 10-13-2007, 07:01 PM
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Join Date: Jan 2002
Posts: 18,355
Strip fuse in the box on left front fender where wires to glow plugs come from.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 10-13-2007, 11:07 PM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
I am getting older, but I don't recall ever hearing the glow plug relay buzz on any of my 240Ds. Never had a 300D so maybe the extra plug makes the gadget buzz.

There are a number of things that contribute to poor starting, especially as the winter approaches and ambient temperatures drop. The issues can range from the battery, to the starter, to the glow plugs to the oil, or it can be something like valve adjustments or cylinder wall wear. On my 1982 240D, the engine mounts failed, and much of the starting torque of the starter was spent lifting the engine off the mounts, leading to the loss of piston speed during the compression stroke, which ends up allowing the block to absorb the heat of compression through a good part of the compression stroke, leading to lower temperatures at the moment of injection, and no light-off. It also let the starter beat itself to death. When I finally replaced the starter and the mounts, the starter came apart as soon as I unscrewed the front support bracket.

So, the problem may just be the glow plug relay fuse. But that is not guaranteed. On an old machine like this one, you may be in for a difficult winter. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 10-13-2007, 11:14 PM
Registered User
Join Date: May 2007
Posts: 116
Have you changed the fuel filters? Usually when one of these beasts won't start, its because its not getting any fuel.
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