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Black Soot

426ted

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426ted Enthusiast

426ted

Posted
Posted

Hey guys, for those of you with the 6.2l, how dirty is your exhaust? I have harsh black soot at the tailpipe and out the condensation hole on the muffler. I always run top tier premium (92-94 octane) gas.

So, is this pretty typical?

 

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Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

Yes, it is the nature of the beast running gasoline.  Now if you were running E85 then that would be gone.  

 

My tail pipe on my camaro was always black running 93 Exxon fuel, when I used E85 it would stay clean. 

drentlaw1 Enthusiast

drentlaw1

Posted
Posted

Pretty normal. I gave up trying to to keep my Corsa dual tip clean. Im catless with just a Flowmaster pro series muffler, so mine is probably worse than most haha

426ted Enthusiast

426ted

Posted
  • Author
Posted

I have other gas powered vehicles; this one seems to leave a lot more black crap, that's all. If this thing had a carburetor, I'd just assume it's running rich.

Retired Bob Enthusiast

Retired Bob

Posted
Posted

My 2014 looks the same way. When it was still under warranty I took it to the dealer and lead mechanic said that was normal. It still bothers me today when I wash the truck and see the muffler. I have tried E65 and I do like the way the truck behaves, esp the transmission.  But locally the only E85 is from a Spinx brand station (not Top Tier) but they do sell E85, pure gas, etc - the price for E85 is only $0.10/gal less than Regular, so the reduced miles per gallon for E85 does not make this a good buy. So I'll live with the sooty muffler.

SkiDooNick700 Enthusiast

SkiDooNick700

Posted
Posted

Holy crap!

Yea,  my muffler weep hole area did get sooted up similar to yours.   I used to wash it and the other parts of the exhaust with an SOS pad every spring.   I just put an aftermarket muffler on,  I didn't pay attention if it has a hole or not. 

 

Regarding the tail pipe... do you ever wash your truck or is that a several month period of build up? My tailpipe never looked like that. 

 

Donstar Senior Enthusiast

Donstar

Posted
Posted

I don't know if I'd wash my tailpipe and muffler, but I'd mention it to my service adviser next time I went in for service and make sure my concern was recorded into their system.  I know this is probably normal (common) but it does appear that your fuel/air mixture needs attention.  

newdude Senior Enthusiast

newdude

Posted
Posted

Normal.  DI do it a bit more than port injection, but I've seen plenty a 6.0 and other LS powered vehicles with carbon deposits all over the exhaust tips. 

Dnt Senior Enthusiast

Dnt

Posted
Posted

On the DI engines black soot is mainly emitted on start up and hard acceleration. You could just never shut the engine off and stop the (act a fool) stomping on the gas pedal and you would not have that deposit on your tailpipe Hahahahahaha 

To clean that I like a kitchen nonabrasive scrub sponge and soap and water. Removes the black deposit without scratching up the exh pipe surface. A toilet brush works perfectly for the inside of the pipe. You should be able to make that look factory new in about 10 minutes max.      

M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted

Its from the cleansing additives in gasoline. The dirtier it burns, the more additives it has. I used to think that shell gasoline was garbage because of how black my tail pipe would get.

Sierra706 Senior Enthusiast

Sierra706

Posted
Posted
On the DI engines black soot is mainly emitted on start up and hard acceleration. You could just never shut the engine off and stop the (act a fool) stomping on the gas pedal and you would not have that deposit on your tailpipe Hahahahahaha 
To clean that I like a kitchen nonabrasive scrub sponge and soap and water. Removes the black deposit without scratching up the exh pipe surface. A toilet brush works perfectly for the inside of the pipe. You should be able to make that look factory new in about 10 minutes max.      


^This. Higher compression ratios run richer to prevent detonation when under load.


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426ted Enthusiast

426ted

Posted
  • Author
Posted

Thanks guys. I figured that it was normal. Way too fun to stomp on it every now and again.

rrmccabe Enthusiast

rrmccabe

Posted
Posted

Adding a chrome tip would make it easier to clean as well.

 

My trailblazer is black after an hour of driving.  I have found spraying it with my favorite all purpose cleaner and then using SOS pads is the easiest way to keep it clean.  I tried polish and sealants with no improvement.

 

 

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