My car (98 W210) began to have a lumpy start so I checked the GP's at the relay. All showed .6-.8 ohm except one which was infinite. No CEL's so far. A week later, starting seems to be worse and now I have a CEL and the GP light stays on. Had one plug on hand so I changed the known bad one. Tested the others at the GP and 4 showed .8-1.1 ohm. One showed .6. After starting the car I still have the CEL and the Glow light is still staying on. Are the readings high enough to warrant changing the other plugs? Will the CEL reset on its own or will I have to reset it?

__________________

Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

YES.
Sounds like you have at least two dead ones.
You must have a glow plug reamer for this job.








Have a great day.

__________________
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

be sure to thoroughly inspect the engine wiring harness, i have seen many diesels just as gas models that have seriously deteriorated wiring harnesses. that problem has also been known to turn on the glow plug light as well. as for the reamer, i have seen a drill bit used on this model aswell with good results. one issue i have seen is the plugs can break off during removal or become very stuck and hard to remove. if they break off, the head will have to come off.

__________________
1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins

I have a reamer and I used it when I changed the plug. I am aware of the sticking problems fortunately this one came out easily. I also put anti seize on the new one.

What would be the cutoff in ohms? Anything above .8? I read on Dieselgiants site in his glow plug "how to" that 1.0 or below is OK.

Anyone know if the CEL will reset? I now have both the CEL and the glow light on again.

__________________

Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

The CEL will reset. Not sure why you have the glow plug light still on. I think the resistance readings look ok. I would check them and the connections once more. Seems like you have a bad plug, still, unless the car starts normally, in which case it seems the glow plugs are fine. On my car when a single plug fails the starting event is significantly rougher, and when two fail it is really rough. I have noticed when I change a bad plug, it is usually a pair of bad plugs, not a single bad plug.

Good luck, Jim

__________________
Own:
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

Owned:
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)

I'll find out in the morning if starting has improved. Starting today was pretty rough, for this car anyway. I'll report back with results.

__________________

Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

If all the GP's are good, the GP coil light will go out. The CEL/service warning will end after 3 warm ups to operating temp from cold cycles.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Apparently bad GP's are contagious. Car started better than day before but still one missing. Rechecked GP Ohms and found the one next to the one I replaced now shows 8 ohms. So again, off with the intake. New plugs arrive UPS this afternoon. I should be able to replace and button it up before dark. I'll report again tomorrow morn. Thanks for the guidance so far.

__________________

Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

Just change the lot of them then,

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow