Smokin 9

[Shaun Type R]

I have recently noticed black spots on my rear bumper and tailgate. I have read a few posts on here trying to fix the problem. The car has a mani and air filter I have recently changed the fuel filter, spark plugs , thermostat.
Its not burning oil and the black spots don't smudge they just wipe straight off. I think it may be overfueling. Will a new O2 sensor fix this or could it be something else.
I wanna get this fixed so I can get on and respray the car cant be dealing with black spots all on the back.

Cheers

 

[NeilEk9]

Get it tuned, mine does the same and it's over fuelling.

 

[Shaun Type R]

Cheers mate nice one. How much do you reckon that will set me back?

 

[tama666]

Cheers mate nice one. How much do you reckon that will set me back?

an hour on the dyno/rolling road, if that.