I noticed this way back when I purchased a 2011, 2.4 Equinox. The inside of the tailpipe was sooty black. I asked the dealer to determine why this was happening; the car had about 1,000 miles at the time. All of my other vehicles had clean tailpipes, no deposits at all.Our exhaust tips looks pretty dark visually, not quite "black" but not the light "tan" that indicates more complete combustion. Any comments from others?
Right you are.I remember when I was young, had older carbureted cars, and we had leaded fuel; We could determine how well the fuel system was working and the general condition of the engine by the color of the tailpipe deposits.
If it was snow white inside the pipe, it was running at the optimum calibrations.
Yes, when I had my 2004 LS1, GTO with port injection; the pipes were absolutely clean inside, same is true with my 2009, 5.3, Silverado.Right you are.
I can get my 2014 3.6L Nox to run much cleaner at the tailpipes if I use 91 octane gas.
On another note, my 2018 Encore 1.4L Turbo with Sequential Port Injection runs very clean with 89 octane.
The deposits wash of quite easily with car wash solution, but doing so contaminates the wash mitt or cloth that is being used.Do you use anything special to clean the black sooty deposits off of the chrome exhaust?
My 2020 Terrain Denali has the black on the exhaust tips too....I was thinking of maybe an oil catch can....it worked on my C5 Vettes......what does anyone think of this ?
Same here, although early on I did fill a couple of times with 91 octane (no ethanol)I have so far only used tier 1 gasoline 93 octane
When we had carbureted engines and used leaded fuel, an indication that the engine was in good mechanical condition and the ignition and carburetion was tuned properly; the tailpipe deposits would be snow white.That makes no sense to me but.....what do I know....back in the day you wanted white at exhaust tips
You've mentioned this before; I wonder what has changed to make the current engines produce less unburned hydrocarbon deposits.One interesting thing I've noticed - - -
The 2015 Equinox we had with the 3.6L LFX V6 engine was very sooty. A week or two driving would make the tail pipe ends and insides black.
The 2017 Chevy Colorado and 2019 GMC Acadia we have with the 3.6L LGX/LGZ V6 engines have much . .. . MUCH . .. less soot at the tail pipe ends.
Even after +3 years and +20K miles on the Chevy Colorado, the tail pipe ends get only light soot that I can only see if I don't wipe them off of many months. I think I may have wiped them down only 2 or 3 times a year when doing a good hand wash.
Based on that. . . somehow the newer LGX/LGZ V6 engines run cleaner.