Carbon from my tail pipe - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 12-29-2005, 10:29 PM Thread Starter
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Carbon from my tail pipe

I have just ran 2 cans of Lubro Moly Diesel Purge through my engine , and changed my fuel filters after doing so. I did this because I had just bought my car (1982 Mercedes 300sd ) and figured since the air filter and oil was neglected so much it need the injectors cleaned as well. Anyway the day after I ran the diesel purge the car was really hard to start(not something that was happening before hand) and when it did it spat out a shi# load of black smoke. Can anyone tell me if this is typical or are my injectors most likely worn?
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post #2 of 10 (permalink) Old 12-30-2005, 05:19 AM
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RE: Carbon from my tail pipe

You need a good italian tune up and things will be fine.
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post #3 of 10 (permalink) Old 12-30-2005, 07:19 AM Thread Starter
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RE: Carbon from my tail pipe

I took the car for a 100 k ride twice since using the purge, leaning on the engine quite alot and still this morning it is hard to start.There is also still the smoke issue upon starting.
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post #4 of 10 (permalink) Old 12-30-2005, 07:31 AM
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RE: Carbon from my tail pipe

how many miles are on the engine?
It's possible that the diesel purge has removed any carbon deposits which were at places where they functioned as an oil seal. think piston rings, cylinder walls, valve seatings, etc. By removing all the deposits, you let oil run around more freely, sometimes places it shouldn't run.
perhaps you should try to put in thicker oil, such as 20W50 or SAE30 and see what happens.
The hard starting may suggest compression loss. This can be caused by worn out piston compression rings. If the engine was run with a really dirty, or even no airfilter, the cylinder walls may be warped out.



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post #5 of 10 (permalink) Old 12-30-2005, 09:06 AM
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RE: Carbon from my tail pipe

If you are truly getting black smoke from the tailpipe it sounds more like an extremely rich mixture. You might have to have someone inspect the performance of the fuel distributors and injectors.
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post #6 of 10 (permalink) Old 12-30-2005, 10:04 AM
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RE: Carbon from my tail pipe

Quote:
adrenelin500 - 12/29/2005 11:29 PM

I have just ran 2 cans of Lubro Moly Diesel Purge through my engine , and changed my fuel filters after doing so. I did this because I had just bought my car (1982 Mercedes 300sd ) and figured since the air filter and oil was neglected so much it need the injectors cleaned as well. Anyway the day after I ran the diesel purge the car was really hard to start(not something that was happening before hand) and when it did it spat out a shi# load of black smoke. Can anyone tell me if this is typical or are my injectors most likely worn?
Not exactly sure what your problem is but I'd recommend you check out mercedessource.com I used them for all sorts of stuff with the two W123's I owned. The guy who owns it may also be of help in narrowing down your problem... he helped me before. They also have a lot of great DIY kits and manuals.

It does sound as if you are running too rich. If the thing was leaking a lot of oil internally you would be puffing out a lot of white/blue smoke... not black. You could also have a bad glow plug or two. If you have a meter check them out. Do do this you just need to make contact on the end where the wire connects... and to the engine block someplace. If you get some kind of reading it's good. if not it's bad. Changed them all out on the last 123 I had and it made a huge difference in startup. Stopped the immediate smoking... and it actually started up all the way ... right away... instead of sounding like it was running on 2 cylinders... then 4 and then 5. The glow plugs are on the drivers side of the engine.

Take care,
Z

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post #7 of 10 (permalink) Old 12-30-2005, 06:59 PM
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RE: Carbon from my tail pipe

Quote:
... and it actually started up all the way ... right away... instead of sounding like it was running on 2 cylinders... then 4 and then 5. The glow plugs are on the drivers side of the engine.
Ahhhhh. That brings back fond memories of my 123...
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post #8 of 10 (permalink) Old 12-30-2005, 07:34 PM
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RE: Carbon from my tail pipe

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tuttebenne - 12/30/2005 7:59 PM

Quote:
... and it actually started up all the way ... right away... instead of sounding like it was running on 2 cylinders... then 4 and then 5. The glow plugs are on the drivers side of the engine.
Ahhhhh. That brings back fond memories of my 123...

LOL... it really does doesn't it?...you must know from where I speak friend....LOL....

sometimes I miss Stinky (it's nickname) Miss having to pop the hood to shut it off.... I miss the trail of smoke.. or maybe I just miss having a car that I could honestly call "Stinky"....LOL the 123 are great cars though.

They do have nice lines though don't they.... hey... found a pic of stinky....

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post #9 of 10 (permalink) Old 12-30-2005, 11:28 PM Thread Starter
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RE: Carbon from my tail pipe

Thanks for the info everyone, I think I'll start with the injectors first tutte. It was my first suspect anyway.
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post #10 of 10 (permalink) Old 12-31-2005, 10:12 AM
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RE: Carbon from my tail pipe

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LOL... it really does doesn't it?...you must know from where I speak friend....LOL....

sometimes I miss Stinky (it's nickname) Miss having to pop the hood to shut it off.... I miss the trail of smoke.. or maybe I just miss having a car that I could honestly call "Stinky"....LOL the 123 are great cars though.

They do have nice lines though don't they.... hey... found a pic of stinky....

"Stinky." I fully understand. Great name! I wasn't half as creative when I named our 123 wagon "Greenie." It was this unusual nonmetallic color called Eibengrun. I loved that car and will post a pic when I locate one. I used to kid one of my buddies by saying "Joe, there's nothing like the smell of diesel exhaust in the morning!"

Best wishes,

Andy
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