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  #1  
Old 06-27-2007, 12:35 AM
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Location: Evansville, Indiana
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Source of mystery smoke?

Hey guys, got a good one for you.

My mechanic friend has semi-retired, and now picks up and delivers cars he is going to work on. He had a customer he's not seen in a while ask him to take a look at the AC on an 87 300TD.

While his wife was following him back to return the car, he made a couple of sharp 90 degree turns (section line turns, if you live out in the sticks) at the church just down the road. When he accelerated out of the turn, the TD produced a huge cloud of black smoke, so bad his wife had to stop, she couldn't see the road. He wasn't on it hard, just trying to speed up. Ditto on the next one a couple hundred feet further on, but no smoke any other time. From a dead stop, no smoke, none under firm acceleration in a straight line, only when turning hard.

My first thought was the EGR going wide open under acceleration (or sticking open due to side force for some reason) since this exactly describes the smoke my old Volvo produced when the EGR stuck on it. However, that was EVERY time you stepped down hard, not just on turns.

Any other ideas? Hans isn't too hot on working on it, too much wrong with it (and the actual complaint was AC, which he isn't gonna do anyway, too much work). He is curious though.

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #2  
Old 06-27-2007, 06:39 AM
Shorebilly's Avatar
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Join Date: Aug 2006
Location: West Virginia
Posts: 1,268
Hmmmm.....very interesting.....

I was wondering if there were any unusual noises when he made those turns.....if all else is the same i.e. no unusual noises, then I would look into the air cleaner, perhaps a bit of trash is in there that restricts air flow during the turns......anyhow, it sounds like an air flow problem to me, but it also sounds like a very large and thick cloud of black smoke.....I am unfamiliar with the newer Benzes....that '87 TD is a bit of an odd duck in the Benz lineup, my '85 300D (Federal) has most of it's pollution control done by vacuum via electrical "switchover" valves ....assuming that it has a similar setup, maybe that car's EGR is opening die to an electrical problem that manifests itself during turning....

SB
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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG
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  #3  
Old 06-27-2007, 07:45 AM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 31,550
oil pooling in the intake and getting sucked up when it is sloshed around?

Tom W
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Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a Lotus 7 replica autocrosser with a modified K20 Acura engine.
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  #4  
Old 06-27-2007, 07:55 AM
Shorebilly's Avatar
Marine Engineer (retired)
 
Join Date: Aug 2006
Location: West Virginia
Posts: 1,268
I had thought about that as well......

Quote:
Originally Posted by t walgamuth View Post
oil pooling in the intake and getting sucked up when it is sloshed around?

Tom W
Initially I thought that perhaps the (what I call a vent condenser) little black can inside of the air filter.....vents vapor into the air intake.....could be the problem, but lube oil in the air intake would more than likely produce a heavy blue smoke, not black smoke.....

SB
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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG
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  #5  
Old 06-27-2007, 08:59 AM
JimFreeh's Avatar
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Join Date: Mar 2007
Location: Hampton Roads, Virginia
Posts: 3,232
Black not blue means carbon...

Could the turning have knocked some carbon loose in the exhaust?

Jim
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05 E320 CDI Platinum blue (daughter's)
94 E320 Cabriolet Emerald green
85 300TD 4 spd manual dark blue
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  #6  
Old 06-27-2007, 09:36 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I'm still thinking it's the EGR getting activated on acceleration with side force (or following side force).

603's do not pool oil in the intake or turbo housing, and the smoke cloud was large enough to engulf a full sized car behind, this isn't a puff or two, more like a bad condtion MACK under full load!

It's possible that there is something floating around in the air filter housing, or possibly the air flow meter is broken (the later might cause the EGR to get switched on).

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #7  
Old 06-27-2007, 09:43 PM
bobman006's Avatar
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Join Date: May 2007
Location: New Jersey
Posts: 32
That black smoke is unburned fuel, not motor oil. Is the ALDA on and adjusted properly? Injectors ok?
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