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08-28-2009, 07:57 AM | #1 |
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Engine black smoke
My 135I smokes on start up and runs rough when cold. When warmed up At full throttle it blows black smoke. You cannot see it from inside the car. My wife was following me yesterday when I took off from a stop.She told me of the smoke. Anyone else have this issue. Thanks
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08-28-2009, 08:18 AM | #2 |
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I haven't heard of any smoke issues, but I know that there is a large amount of sut around the tailpipes of mine. I thought it was due to the tune. I am interestred to know if there are others with the issue...
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2009 135i SGM, Premium, Sports, Nav.
Dinan Stage 2 software, Injen intake, RR Oil Catch Can, H&R Pro-coilovers and springs, H&R front sway bar, Vorshlag camber plates, Vorshlag comp studs, BMW strut brace, BMW performance pedals, G-Force harneses, BMP tow hooks, Breyton GTS-R wheels with 255-35R18 (square set up) and custom axel back exhaust with muffler delete. |
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08-28-2009, 08:56 AM | #3 |
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Black smoke is unburned fuel. Just imagine what that is doing to your exhaust valves and destroying your catalytic converters. Have you got any tunes or modded downpipes? If not - I would take it into the dealer and have them check it out.
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08-28-2009, 10:04 AM | #5 |
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Sometimes cars blow off stuff through the exhaust on full throttle. If it's just a puff of crap I wouldn't worry about it. If it's continuous black smoke, then yes, I'd address it right away.
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08-28-2009, 10:47 AM | #6 | |
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08-29-2009, 09:31 AM | #8 | |
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Now, the puff of black smoke on start up is a bit odd I think. Do you have any long-crank issues or does it start right up? |
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08-30-2009, 04:40 AM | #11 | |
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Wait, you said it runs rough. That could be a faulty ignition coil, possibly very likely as that would cause a rough idle, and potentially exhaust smoke. As for the black smoke at WFO throttle, turbo's are notorious for this. When going WFO the air/fuel ratio goes rich and often people will see this from behind. Depending on the lighting outside this is more or less visible, but it depends on lighting. I notice it on my other turbo cars when the sun is low in the horizon and behind me. WFO and I can see light smoke. If there is some blue mixed in, you could get some blowby oil in there as well. Many turbo setups collect a good deal of oil especially in the intercooler. So on WFO and high boost some of that oil could get sucked/forced into the combustion chamber and create some smoke. It's typcially normal and not hurting anything other than very dirty sooty exhaust. |
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