I'm not getting ANY reading on any of them by doing the above.
Should they read SOMETHING if they are bad? or Zip?

Relating to GP's, is it common for ALL to go at once or is something else going astray maybe?
I've had 1 or 2 go bad on my Dodge, but never all at once and even then truck would almost fire or at least fire hard.
This MB doesn't do a THING.

Thanks

Even one bad plug on a 617 will sometimes cause it not to fire. No reading=bad.

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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

Its not that uncommon to have several to go at once...I have heard of all 5 being bad but usually that is after an extended period of no maintenance. Replace all 5 with decent ones (I recommend Bosch). Also adjust your valves if it has been a whiel.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Have you reviewed dieselgiant? The last time I was there, it was pretty complete - including pretty pictures. You could measure resistance on a new plug & know what they read on your meter.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Most likely senario is that as one after another failed the starting ability just declined. Eventually there where no glow plugs left to fail.

This may be a good thing as an engine able to do this usually has very good compression. It is not unusual for some diesels to not want to start with only one or two glow plugs burnt out.

Look up reaming the glow plug holes up in the archives. . If the car saw little highway use and a lot of ideling the prechambers may have carboned up more than normal as well. These engines should experience a good highway run once in awhile. Cleans out some of the excess carbon if present.

Great info folks, thanks.