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  #16  
Old 06-19-2008, 11:45 PM
Johnhef's Avatar
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Location: Frederick, Md
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eh well maybe I have another problem, it developed a pretty pronounced knock today. Its going to sit out from autocross this weekend and I'll try to get time to mess with it next week. this car was great for the first 4 years with almost no problems so I guess it's overdue.
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #17  
Old 06-20-2008, 08:12 AM
C Sean Watts's Avatar
NOCH EIN PILS!!
 
Join Date: Mar 2006
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Yes,

Quote:
Originally Posted by babymog View Post
The recall replacement is under the car in the downpipe, right? I'm not sure of your post.
Mine is under the car, down stream from the turbo.

UPDATE: Stay tuned for photos.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
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  #18  
Old 06-20-2008, 08:28 AM
C Sean Watts's Avatar
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In some states...

Quote:
Originally Posted by ForcedInduction View Post
Why not just put a straight pipe in placeof the cat?

That would be an instant annual inspection failure. I forget the exact verbiage but in NC, at least, it's something like, "Emission control equipment must be correctly installed, not bypassed or defeated." Even if the car is not subject to exhaust gas testing.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!
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  #19  
Old 06-20-2008, 01:12 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
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Quote:
Originally Posted by babymog View Post
The recall replacement is under the car in the downpipe, right? I'm not sure of your post.
The recall should at least replace the pipe from the exhaust manifold to the turbo and everything south of the turbo.

It sucks that they went from a 3-bolt to 4-bolt flange between the downpipe and midpipe. They might even have shifted the location of the flange so a catless downpipe isn't a bolt-on replacement. I guess if you find a catless midpipe you can get the rest of the exhaust system. Or is this rustless California thinking?

Has anyone checked what a new cat costs from MB or Timevalve? I'm only asking for the benefit of those who won't consider a straight pipe.

Sixto
87 300D
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  #20  
Old 12-31-2008, 09:00 PM
Carson357's Avatar
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Location: San Diego, California
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removed mine today, car was somewhat more powerful, the unit that was removed was partially clogged, for the first few hard accelerations there were huge clouds of residual soot from the exhaust. apparently removing allowed more flow to remove the build up
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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:
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Ram 2500 Cummins
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  #21  
Old 01-01-2009, 12:40 AM
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wanted to post a follow up post after driving this evening, the car now appears to emit alot less exhaust smoke, the heavy smoke i used to see was not smoke directly from the engine, but rather soot what would accumulate in the oxy cat, and blow out during hard driving. i guess these units become inactive overtime, as i said in previous post mine was partially clogged
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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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  #22  
Old 01-01-2009, 03:27 AM
ForcedInduction
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The particulate filter is passive. It requires hard driving to get exhaust temperatures up enough to burn off the trapped soot.
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  #23  
Old 01-01-2009, 04:01 AM
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Quote:
Originally Posted by ForcedInduction View Post
The particulate filter is passive. It requires hard driving to get exhaust temperatures up enough to burn off the trapped soot.

i had previously performed many "italian tune-ups" for several miles with no change, i dont think it was doing what it was intended due to age and limited exhaust flow, the huge clouds during the first drive tells me that the exhaust flow was reduced or all that crap would not be present, it only did it for 3-4 hard accels from stop then was gone
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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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  #24  
Old 01-01-2009, 04:16 AM
ForcedInduction
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Right. Once a channel is plugged off with soot, its dead.

Even the modern filters used on trucks are often replaced because they fail to regenerate completely.
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  #25  
Old 01-01-2009, 04:17 AM
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www.stonebrew.com
 
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Quote:
Originally Posted by ForcedInduction View Post
Right. Once a channel is plugged off with soot, its dead.

Even the modern filters used on trucks are often replaced because they fail to regenerate completely.
more than 1/2 the channels were plugged
__________________
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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  #26  
Old 01-01-2009, 07:29 AM
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Our 87 300TD suffered a significant loss of power, coupled with huge anounts of black smoke.

This was several years after the warranty replacement of the trap oxidizer.

I found a very high backpressure, using the port in the front of the exhaust manifold, then verified the problem by loosening the downpipe from the manifold. Car ran like gangbusters after pipe was loosened.

Removed the oxy cat and found it plugged. Chucked it in a large vise and sharpened a piece of rebar to look like a flat screwdriver. Broke out the ceramic matrix and left the hollow case. One of the flanges is close to the oxy cat material, easy enough to do.

Car ran better than ever and appeared to be stock when inspected.

Jim
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  #27  
Old 02-06-2009, 10:22 PM
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Quote:
Originally Posted by JimFreeh View Post
Our 87 300TD suffered a significant loss of power, coupled with huge anounts of black smoke.

This was several years after the warranty replacement of the trap oxidizer.

I found a very high backpressure, using the port in the front of the exhaust manifold, then verified the problem by loosening the downpipe from the manifold. Car ran like gangbusters after pipe was loosened.

Removed the oxy cat and found it plugged. Chucked it in a large vise and sharpened a piece of rebar to look like a flat screwdriver. Broke out the ceramic matrix and left the hollow case. One of the flanges is close to the oxy cat material, easy enough to do.

Car ran better than ever and appeared to be stock when inspected.

Jim
Jim--- BINGO!

I actually did just that tonight after resurrecting the car a few days ago, its been a slug and I noticed the boost reading (8psi) was much lower then I remember when I last drove it almost a year ago (15psi). Got a little too happy with the air chisel and poked though the upper part of the other end of the cat.. whoops. peened it all back down again after removing the guts and I'll weld it shut some time next week.

Holy freaking crap batman!! the car runs like a raped ape now. Started to head home but decided to go back to the shop and turn the boost back down since on my 0-15psi gauge, it was now pegging at the underside of the peg at the 0 mark.... now at 12-13psi under max load and eveything is dandy.
__________________


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #28  
Old 02-08-2009, 09:25 PM
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Diesel Dean
 
Join Date: Feb 2004
Location: Canterbury CT
Posts: 204
Hi all, while browsing through this thread, I thought to myself (the SDL seems more sluggish lately). So, armed with a 12mm ratcheting combo wrench, a BFSD and a BFH, pulled the SDL up on the ramps, put the rear on jack stands and began to remove the pipe and converter. Once apart, I inspected the Cayalyst material from the side closest to the flange. This being the outlet side I expected it to be fairly clean (it was nasty). I assumed that this was causing extra back pressure, so it had to go. Several hard blows to the catalyst was enough to start it crumbling. I needed a needle nose pliers to break up some of the larger pieces to allow them to exit the outlet. I then reassembled the flanges and took her for a test drive and WOW WHAT A HUGE FREAKING DIFFERENCE!!! I wonder how long it had been building up the crud in there. Well she's breathing much better now thanks to the thought provoking ideas seen here. Thanks to all who dare to try out their ideas and post their results here.
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  #29  
Old 05-16-2009, 09:42 PM
C Sean Watts's Avatar
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Here's the update

We finally found the pics.

See if you can figure out the upstream from downstream sides.

We removed the 'obstructing' material and welded it back together. On start up, I immediately noticed a smoother and quieter idle. Throttle response was faster and turbo spool was much faster. It also ran a bit cooler. I then did an Italian tune up and briefly made a THICK smoke/particle cloud bad enough to be a visual obstruction out on the two lane country road I was on.
Attached Thumbnails
OxyCat-100_0931.jpg   OxyCat-100_0932.jpg   OxyCat-100_0933.jpg   OxyCat-100_0935.jpg  
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  #30  
Old 05-16-2009, 10:26 PM
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Waiting for his Model 3..
 
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I have to wonder how bad the ox cat on my TDI is... They usually don't plug that bad. Perhaps they've made some improvements since they were introduced.

When did the recall to fit the ox cat start? I know the first VW to get one was in 1991.

-J
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