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  #1  
Old 04-23-2003, 06:26 PM
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Join Date: Jan 2003
Location: USA
Posts: 699
Strange plugs which are interspersed with glow plugs.

Dear friends:

On my 1981 240D, I saw 2 strange plugs which are connected
to the same engine side (right facing the front of the engine) as
the 4 glow plugs. You can see them clearly as 1 and 2 on the attached image. What are these 2 strange plugs and what are their function?

BTW, the plug #1 has an attached connector while the plug #2
doesn't have anything. Am I missing some connector here?

Thanks a lot for your help.

Best regards,

Eric
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Strange plugs which are interspersed with glow plugs.-strange.jpg  
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  #2  
Old 04-23-2003, 06:58 PM
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Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Eric,

From the shop manual I have for my 240D, the item labelled #1 is the preglow system temperature sensor. This thing has an input to the little black box that energizes the glow plugs that is used to figure out how long the dash light should stay on before you twist the key to engage the starter.

The other one I think, as was noted in the other thread, the sender for the engine temperature display in the instrument pod on the dash. It is not clearly identified in my manual, however, I think it has a socket like connector. Look at the end of it and verify there are no threads for one of those other mysterious electrical connectors.

I am curious, when you start the car, does anything on the dash work? Seems with all the cut and loose signal and other small wires, you should have a bunch of stuff that does not work. Knowing what they are might help sort out some of those unidentified wire stubs and loose wires. 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)
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