My 87 tdt just failed the opacity test 40% max is 20%. My buddy was driving and i wans't their. The car runs good any suggestions?

Biodiesel

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

Last time it pass easily but probably had bio in it. What might be wrong with it. He is buying car. do these 25 year old motors just smoke

You could screw the ALDA in all the way. I have also burned 'Jet A' with good results....

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

If you get on the accelerator Pedal fast and hard most Diesels will smoke.

You did not say the mileage on the Engine. The more worn out the Engine is and if the Injectors have never been checked it cold also be them helping the cause of smoke.

Fuel Injection Pump Timing?

The other stuff mentioned in Posts #2 and #4 could do the trick to get the test passed.

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84 300D, 82 Volvo 244Gl Diesel

Motor has 160k on it, did monark injectors 2 years ago from s. watts. We only drove the car once or twice a week. I sure we can get it to pass just wondering why it might be smoking to much. Could the cat. be plugged/not working properly?

Sounds like it was run on a cold engine with unknown timing and they mashed the pedal.

I'd make or buy some biodiesel and redo the test with a hot engine.

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment

Are you in Phoenix? When I took in my 1980 300SD with 315,000 miles (at the time), they tester romped on it hard and it still passed well below all the requirements. And that was with diesel.

If you want to try a tank of biodiesel in order to pass emissions, Western States Petroleum at 450 S 15th Ave, Phoenix, AZ ‎has B99. It's been about 50 cents a gallon cheaper than diesel, too.

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DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles

40% is a lot of smoke. Does your car belch smoke when you floor it? Have you taken it for a good high speed run?

-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.

Go out for an Italian Tuneup with some biodiesel and try the test again.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

X2....

Worth checking the Air and Fuel-Filters are good, and any/all turbo hoses are tight and not leaking...

You could stick some 'Millers' or similar fuel-conditioner/injector-cleaner in first then-

Drive it like yer stole it, to blow the crud outta the exhaust system, running up to max revs for a short time at full throttle--while driving.
--Prob notice clouds of greyish/black crud in your mirror for a bit which should/will clear, at sustained full power.

Then re-test.

Used to be a Tester here in UK--and this was the general 'cure' for this problem

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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....

I agree. Fresh filters, Italian tuneup, and retest on a hot engine. If it fails again come back and tell us. There are some other things we could look into then.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

Smokes when floored, Western states is where i was getting bio. we will try that with some heavy driving before next test

It isn't that high revs are needed, it is high load for a extended period of time. Have a trailer hitch? Can you tow some weight around?

Diesels wet stack when run lightly loaded, this leads to carbon in the combustion chambers ( and injector tips ) and exhaust system.

Go out for long hill climb or something that can run it hard without ultra illegal speeds...chances are the exhaust system is holding 20lbs of soot and it is blowing out on the test. I have removed exhausts that were packed with soot, it does happen (twice as heavy as the replacement exhaust!).