Well the reason I checked these things is because on cool mornings, as of late, I will start the car. After the buzzer, the car fires right up but idles like crap and sometimes stalls if I dont hold the throttle. In searching, most everyone said it was a GP issue, even though I would have suspected some kind of cold start fuel issue. ANYWAYS. I just disconnected all the wires to the plugs and with them in the block, connected the leads to the stud and the 12mm hex. In every one I got a resistance reading of 0.00. I'm not using the best quality digital multimeter but I would guess it wouldn't be that far off. The fact that the car starts in the morning tells me they are not all bad. Am I doing something wrong?

It depends on how cold it is at your location. Pull 'em out and put 12V to them and see if they glow.

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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

I suspect the accuracy of you ohmmeter is not that accurate. It should read very low ohm, may 1-2 ohm. If it is all 0.00 then there is no odd man out. ALL are good within the accuracy of your meter. Normally when they are bad, they read high ohm or open circuit. Hope this help.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

^ I'll agree, they should read SOME resistance.

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83 SD

84 CD

if your meter is accurate, zero means dead short. but i have a hard time beliving everyone of them is shorted

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OKay so I need to find a more primo multi meter (workin on it) and/or pull these damn things.
SO say my meter is good for reference and they are all reading the same, meaning they are all good. Any ideas of the harsh idle at cold start?

Possibly normal behavior. How cold do you mean by cold (location?)? What year and model are we talking about?

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

good tools are neccesary to actually diagnose an issue.

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It is also posible that the one or more wires are bad . . . or the relay . . .

I just got done doing this for my 240 here http://www.peachparts.com/shopforum/showthread.php?p=2307855#post2307855

Pulling the glow plugs are not really all that hard, I've heard say that the #5 is harder because of the location of the oil filter, but I don't have that cylinder

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82 240D Manual 277K and still rolling!
02 Volvo S60 AWD For Sale

Maybe you just need the valves adjusted.
if the thing starts then the erratic aftermath may be due to valve adjustment.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD

I live in Ohio. we've only got down into the forties (since Ive owned this car) If all the plugs come out allright, Ill start going down the line. So these cars do not have some device to supplement more fuel on cold starts like on fuel injected gassers?

What car/engine do you have?

If you have a aluminum head they may come out hard . . .give one a try!

No extra fuel . . .

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82 240D Manual 277K and still rolling!
02 Volvo S60 AWD For Sale

81 300sd. Ill get em all, Im just sureIl drop a few toolsin the process. Thr injrctor lines really get in the way, and oil filter housing.

Stuff a rag under the glowplugs (between the engine & injector pump) then you won't have to dig as deep, when it gets dropped.

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82 240D Manual 277K and still rolling!
02 Volvo S60 AWD For Sale

Does your glow light illuminate as it should? Any flashing?

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles