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#1
09-17-2008, 09:51 PM
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New Trap Oxidizer thread!!
since i bought my 300SDL i have been doing alot of internet searches looking for a new cylinder head, one thing i saw quite a bit of was people saying that mercedes removed their trap oxidizer for free....
of the documents i have seen,the trap was removed from the engine compartment and an oxidation catalyst was installed and relocated to under the car. was there a point when the ox cats were removed completely? and do they cause any known issues if left inplace? see original trap issue service campaign below http://members.cox.net/mercedessd/trap.pdf
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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 
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#2
09-17-2008, 10:04 PM
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I have read (here) about clogged ox-cats. never experienced it.
As the trap-ox is upstream of the turbine, it can damage the turbo. The ox-cat is downstream, so it can restrict exhaust flow but its disintigration can't send debris upstream into the turbine blades.
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 Gone to the dark side - Jeff
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#3
09-18-2008, 12:01 AM
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On some higher mileage VWs with the ox cats, especially those that are tuned and make a lot of soot, you see some plugging. But generally they just stop working well after some time. The one on my TDI isn't doing much anymore.
-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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#4
09-18-2008, 12:26 AM
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The FSM includes a back-pressure test for a plugged trap cat so apparently it can happen.
__________________
 "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
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#5
09-18-2008, 01:21 AM
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I say remove the Trap Ox from underhood (if you still have it) yourself. This way you'll retain the catless downpipe...
Most 603s have the trapless pipes so finding them isn't too difficult.
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I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#6
09-18-2008, 02:39 AM
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Quote:
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