Black soot in exhaust tail pipe. Excessive sootblack smoke coupled with poor mileage is a slam-dunk that the fuel deliveryfuel control system is working improperly. The reason I am bothered about this is years ago only cars that were burning too rich would have sooty black tail pipes. A clean burning engine would result in a light gray coating on only the inside of the tail pipe. I clean mine and the the next time I look the bottom half of the tail pipes are black with soot again. When I got my first vehicle with direct injection 2011- 24 Equinox I noticed right away the soot in the tail pipe that seemed excessive. So the black soot is just water mixed with carbon in exhaust pipe. I installed a KN FIPK kit and a high flow muffler when I bought the jeep and it runs great.
It means nothing of significance. Noticed black soot in tail pipe if you rub your finger in it. Reading the sparkplugs tells the story much more than the pipes. Which is amazing because I ran that car through that wash at least once a week. If the exhaust is coming out of your tailpipe its likely because the engine is overworked. The black specs on the paintwork arent only just the soot from the exhaust they maybe rubber from the tyres.
If you drive shorter trips the vapor condenses on cooler surfaces and leaves a bit of soot behind. To me it means running rich. Shell Optimax the sooting wont be so bad. Black sootresidue at exhaust tips and rear of vehicle.
So the liquid water drips out of exhaust with the carbon mixed in it making it black. That said some soot in the pipes is pretty normal as is some bluing of the pipes. Youre burning hydrocarbons. Soot is a byproduct of direct injection. Inside of the tail pipe is CAKED with black soot. I installed a KN FIPK kit and a high flow muffler when I bought the jeep and it runs great. Blue pipes indicate lean not enough fuel to airblack soot indicates rich too much fuel to air. Lean is worrisome as it can cause engine damage rich will mostly just foul sparkplugs.