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Im having a lot of black dust on my rear bumper, more on the driver side, can this be burned coolant (car smell à lot like i said in another thread) or maybe its just normal?
Im pretty sure its not my brakes, there is not dust on my wheels.
Black smoke/dust/soot is usually a sign of too much gas and running rich.
i overfilled her last time, that could explain the soot because thats the first time this summer ive seen that... Also its getting colder on colder here in Québec, but i think that with cold air there is less chance of running rich, again im not an expert, got the car for only 2-3 month, previous was a 350z which is a totally different car...
sorry for my poor english, im a french Canadian
Hi Richard. I get the same thing. I wash the car about once a week but use it pretty much every day. Always see a bit of that on the rear bumper when washing it. I suspect unburnt hydrocarbons. Do you have a stock exhaust? Any ECU tune?
I get it too. May also be tire rubber, brake material or just plain old road grime. I never really considered exhaust, as mine is usually all the way from the wheel arc back.
Hi Richard. I get the same thing. I wash the car about once a week but use it pretty much every day. Always see a bit of that on the rear bumper when washing it. I suspect unburnt hydrocarbons. Do you have a stock exhaust? Any ECU tune?
Not coolant. You'd smell the odor of antifreeze if it were.
If you overfilled the engine with oil that's not good, but plays no role in the amount of soot. For every gallon of gasoline the engine burns it produces around 19lbs of carbon, mostly in the form of CO2 but some in the form of soot. A bit extra oil in the engine and a bit extra oil consumption possibly arising from this will not affect the engine's carbon output to any significant degree.
If the engine was running overly rich the CEL would be on.
So, the bulk of that is just tire dust. Normal.
The back of my Turbo collects a lot of this black tire dust in no time. The roads here haven't been rained on in months and the tire dust is thick. (One contributing factor why the roads are so treacherously slick with the first rain.)
An incomplete burn CAN cause the car to sooty; however, when the humidity is low enough, just driving the car produces an electrostatic charge which can cause dust and other very small debris to be attracted to the car.
10-10-2016, 06:37 PM
Black dust on rear bumper
t that in usa
