is it normal for our cars to have some black carbony substances inside our exaust pipes even if its just a little......not to mention that had a bad o2 sensor that never registered on my SES light b/c i had a bad PCM so it came up after i got my PCM changed...but anyways is it normal to have a little of this inside the pipe....j/w cuz i heard all car with big engines this happens.

 

ome guy also b4 aked if u should plug up the holes after doing the throttle body bypass and didnt get an answer just wanted to know if u should do that?? thanks guys/gurls

 

i think its normal, especially if its only a little bit, if it looks real bad , then maybe its of a concern, but i doubt it.. its either burning too much fuel, or burning oil my first camaro burned oil , bad enough.. about 1 quart every week 1/2.. :/ and the inside of my exaust was black after 1 week lol, and i mean black where i scrape my finger inside it and it still looks just as dark and i cant see my finger any more If its that bad and you have a "new" or rebuilt motor.. somethings up

 

yeah my intake seal went bad so i had to get it re-sealed....this could cause that??
the buildup felt a little oily but i wasnt sure if that was a reason....whent i would rev the engine it put out a slight puff of black smoke...nothing big....but then i got it fixed and i dont think it happens anymore...now that its fixed just whats still in the pipes remains..
so could a bad intake seal cause and oily buildup in my exaust??

 

its normal, dont worry about it. we all have it.

 

yea, it is normal. my exhaust is about 6 months old and it is already caked up. Don't worry about it

 

my car puffs some black smoke after I rev it. I even have a video of it doing that. Id say its perfectly normal.