Pagoda SL Group
W113 Pagoda SL Group => General Discussion => Topic started by: 250SLFranco on June 13, 2019, 20:44:00
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When I start my 250SL up after a night in the garage, the garage floor and the cabinet facing the exhaust get splatterings of black stuff......
What is it and how can I stop it from happening? Is it an indication of a bigger problem I should address?
250SL Franco
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The engine may be running a bit rich, coating the inside of the exhaust pipes with black soot (carbon). Easily seen if you look at your tail pipes.
So now we have to go back to high school chemistry class: When you combine a hydrocarbon with oxygen you should get carbon dioxide and water. If you are running rich, you are going to get carbon, carbon dioxide and water.
When you first start your car, the exhaust system is cold, so the water in your exhaust condenses from steam to a liquid state and the water droplets can travel all the way out to the end of the cold tailpipes, collecting carbon soot from the interior walls along the way. The result is the spray of sooty black water droplets on the garage floor and cabinet behind the tailpipes ( and the shins of your khaki's if you happen to walk around behind your car when it is idling!).
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.....and make sure your wife is not wearing white trousers & standing behind your Pagoda when you start it !
Don't ask
Paul
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A piece of cardboard o n the floor helps.
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I have experienced the same thing with my 250 SL and still have a pair of trousers to prove it. I have reached the same conclusion as Mike Hughes, that is that this is normal for a car with 50 year old technology. Otherwise my car runs great and I doubt it could be improved upon so I'll just back my car out of the garage as soon as I start it and let the "black stuff" fly.
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Or you could fit these tailpipes
A116 492 0514
They work well and deflect the exhaust downwards
Paul
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I had that problem too until I put in new injectors, and had the injection pump rebuilt.
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I too wish I could reduce the amount of black soot that shoots out when the car is started cold. I'm still struggling with my WRD, starting aids and cold idle...
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Kent (mercedessource) has done a couple of videos regarding this issue. The links have been discussed on our forum prior. Not all agree with everything Kent says about Mercedes, especially Pagodas but worth a look.
https://www.youtube.com/watch?v=PLedjKWbU5w
https://www.youtube.com/watch?v=nmkiBz65Wjs&list=PLtRKk64pu2wr2hetff0CXA-nDXVfPqfQ5&index=6&t=0s
There are more videos - just posted two.
I believe a couple of folks on our forum have taken his suggestions about the injectors - would be interesting to know if they were able to quantify a difference.
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I replaced all my injectors 2 years ago before our Irish trip, it made no difference to sooty start up or mpg,but car runs fine, so I am happy,that's why I used the deflected exhaust tips..
Now we have just arrived in Germany for Pontoon Rallye in Hameln.
Paul and Dolly