I am getting the glow light on the dash after starting car and then it goes out. My understanding is that this indicates one of more glow plugs is bad?

I pulled the glow plug harness from the relay and tested each port with OHM meter.

Plugs #1-5 registered 1 OHM.

Port #6 registered nothing. There is no continuity.

I confirmed the glow plug relay was putting out 12V at each of the pins and it makes a clicking sound.

Does this mean this #6 is a bad glow plug? If so, should I change the others at same time? I've read about the horror stories of replacing these plugs and am going to have a mercedes tech with experience do it.

__________________
-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991

Vehicle now has 171k miles (just updated signature).

__________________
-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991

Bad glow plug on #6.

__________________
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

If you're having someone else do the work (as I would do), you might consider letting it go until another plug or two goes bad. It will certainly start reliably with five working plugs.

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I am having rough starts....about 20-30 seconds of missing and white smoke then she goes smooth.

Is it possible other plugs are bad even though they register 1 OHM?

Shouldn't # 6 at least show a completed circuit? I tested the harness before installing and wires were good.

__________________
-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991

Classic symptoms of a bad glow plug.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Of course it should. The fact that it doesn't is not insignificant.

Can you get a probe on the #6 plug connector and test continuity back to the glow relay connector?

Sixto
87 300D

I'll have to remove air intake to get to glow plug six connector. I tested it before I installed the wiring harness for continuity and it was fine.

__________________
-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991