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Old 02-16-2011, 12:12 PM
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85 300SD - Help identifying part

Hey, I'm a noob to these MB's and have a question. I have an 85 300SD and wondered what this piece was. Sorry for no pic, but this is probably easy for you seasoned guys. Its located on the top of the valve cover about in the middle. It looks like a little module (2"x3"?) with a 3 pin connector. It interacts with the linkage assembly mounted next to it. The 3 pin wire harness on mine has deteriorated and isn't staying on the module (for lack of a better term) and I wondered what this was and what effect it was having on the car. Thanks for the help.

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Old 02-16-2011, 12:17 PM
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yup.
easy.
EGR trip switch, basically.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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Old 02-16-2011, 12:30 PM
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Thanks!
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Old 02-16-2011, 02:31 PM
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On an 85 I thought that was for the A/C compressor cut-out at WOT going to the KLIMA?

Where is that microswitch then?
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1985 300SD 322,000
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Old 02-16-2011, 03:23 PM
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Yup, on 85s it also goes into the Klima relay for compressor cutout on WOT.

-J
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Old 02-16-2011, 04:23 PM
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So its not an EGR switch? Sorry to ask, but what is WOT and KLIMA?

Last edited by BigSkillet; 02-16-2011 at 04:29 PM. Reason: I can't spell
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Old 02-16-2011, 04:33 PM
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WOT is wide open throttle and KLIMA is the relay that takes diffrent inputs and either allows or does not allow your ac compressor engage.

EDIT:

The compressor control relay monitors the engine speed vs. compressor speed to protect the belt system from a locked compressor. It disengages to protect an overheating engine and to provide extra power in diesel models, and may possibly disengage to protect a low or erratic idling motor or an under-voltage system

courtesy of: http://www.continentalimports.com/ser_ic60046.html
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Last edited by 4thesporty; 02-16-2011 at 04:57 PM.
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Old 02-16-2011, 04:54 PM
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The EGR system probably does not use that sensor, as I recall 1985s have a fuel rack position sensor.

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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Old 02-16-2011, 04:58 PM
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Quote:
Originally Posted by compu_85 View Post
as I recall 1985s have a fuel rack position sensor.

-J

Correct...located on the front left of the IP if looking at the engine from the fan.
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1985 300SD 322,000
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Old 02-16-2011, 07:27 PM
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aack... open mouth, insert foot... learn to read correctly... sorry.
pre-85 it's for EGR... sorry again!

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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