carbon in exhaust

[juiceme]

hello i am a owner of hyundai entourage which is a 2007 model and i had bought it second hand

my problem with this car is that i have recently noticed that carbon has been accumulating on the chrome tips of the exhaust.

any clue of how could this have happened as i got my car serviced just 2 mths back

please help

[highfly]

Check spark plugs if it need change.

If not use injector cleaner from STP from eppco or Emarat and drive at 120kmph for atleast 1 hr on highway. And see if it helps cleaning the injector and carbon.

Put whole bottle in quarter tank not full as said by STP.