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Back of my car gets black!?

Especially when I have been driving quite hard the back of my car gets a film of oil/fuel?? over it. I have had the cats removed, would this make a difference? What exactly is this film I am seeing?

 

Thanks guys

 

Dan

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    Mine gets the same black spots all the time!!!!

     

    And yes i am overfuelling, but hey..........

     

    Al.

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    mine will around the exhaust but over time not straight away, it used to get coated instantly. Get it on a wideband air/fuel meter see how its running.

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    I get that too I know mine is running a bit rich will get it on a co machine 1 day ! Dont know what it should be set to though.

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    Especially when I have been driving quite hard the back of my car gets a film of oil/fuel?? over it. I have had the cats removed, would this make a difference? What exactly is this film I am seeing?

     

    Thanks guys

     

    Dan

     

     

    i suspect most of the zeds will chuck out a bit of black soot, it dosent help when you own a white car though, you'd notice it easier.

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