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BMW 3-Series (E90 E92) Forum
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Black soot found on driveway right under tailpipes
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08-14-2018, 03:21 PM | #1 |
Lieutenant
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Black soot found on driveway right under tailpipes
Car has nearly 169K miles, starting to have some form of black soot build-up on my driveway, right under each of the exhaust pipes. I have no CEL / DTCs appearing, but I'm noticing a pretty strong fume on start-up and poorer MPGs. Thoughts?
I do know that the dealer did specify I needed a new valve cover (not specifically the VCG). It's the original one. I'm assuming they're right, as I'm also losing oil from time to time. Should I assume replacing the VG and getting say a walnut blast to correct my issues. I haven't really speculated the fuel injectors as I'm not experiencing any misfire nor codes. Please advise...
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08-14-2018, 08:32 PM | #2 |
Second Lieutenant
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My guess would be either o2 sensors or injectors, but I'd lean more to injectors. I've had leaky injectors and no misfire, so something to look into.
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08-14-2018, 09:34 PM | #3 |
Private
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Do you hve exhaust tips and clean the final few inches of the pipes? If the normal exhaust buildup has not been cleaned and an oil leak has begun, it is completely plausible to have buildup increase without creating a notable cloud. I have 68K on my 09 328i and recently cleaned the exhaust tips so I can keep an eye on buildup thanks to threads on the board illustrating the myriad of leak issues with BMW.
A nice trick I learned from a custom guy in Fort Benning years ago. It has served me well for years and a step I take when I pick up a used vehicle.
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08-14-2018, 09:51 PM | #4 | |
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Drives: 2007 Black/Black 335i e90
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It could be bad turbo seals It could be a leaking injector |
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