is this for emissions?




thanks,
manny

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toyota fj40 landcruiser with a mercedes om617 3.0L turbo diesel

did a quick search, looks like this is some sort of rack sensor found in 85 specific IPs...

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toyota fj40 landcruiser with a mercedes om617 3.0L turbo diesel

anyone know exactly what it does. I have always been curious and never could find a specific answer.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

The fuel rack position sensor talks to the EGR electronics, telling it how much fuel is going into the engine via the IP. If you have EGR disabled on an OM617, the only thing the EGR electronics does is process the engine rpm signal and send it along to the tachometer. The EGR electronics must stay connected or the tach won't work but the rack position sensor is irrelevant with EGR disabled.

AFAIK, the only cars that have this setup are the 1985 300D-T and the 1985 300SD. I have never completely understood what Mercedes did in the 1984-85 time frame and the 1984 California cars may also have had this setup.

The early OM603 engine (in the 1987 300D Turbo) has a very similar setup except that the EGR electronics has "evolved" (if that is the correct word) into the Electronic Diesel System (EDS) and also does an electronic idle speed control of the IP. EDS must be connected for the electronic idle and the tach to work.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Even my '98 injsection pump has the exact same type of sensor except in it's application, it's critical to maintaining idle speed and other parameters.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250