black dots? - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
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post #1 of 7 (permalink) Old 07-02-2006, 07:16 PM Thread Starter
 
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black dots?

does ayone esle have little black dots all over the read end after driving sometime?
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post #2 of 7 (permalink) Old 07-02-2006, 07:59 PM
 
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Was it wet out? I have noticed after driving my new car in the rain that the only part that gets dirty is the rear end. Looks like white spots on my black car though.
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post #3 of 7 (permalink) Old 07-02-2006, 09:50 PM Thread Starter
 
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it looks like it is coming from the exhuast.i think it might be carbon build up.
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post #4 of 7 (permalink) Old 07-02-2006, 11:44 PM
 
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I would say if you are worried about that maybe look into a factory cleanup see if they can do an old oil cleanup or reccomend a safe additive to help clean out the motor.

Or run some chevron high octane through it for a couple tanks and see if that helps.
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post #5 of 7 (permalink) Old 07-03-2006, 07:04 AM
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Its carbon from the exhaust. Mine has it too. You need to clay bar the car and wax it to prevent that. The clay will take it off, and the wax keeps it from coming back.

We need more boost!

K&N CAI, GMPP exhaust w/XTC 3" d-pipe,
Ported stock exhaust manifold, B&M Shifter
Stage 2 w/2.8, DC Sport sturt brace,
Torque brace, CAB's, poly Trans mounts,
225/40/18 BFG KDW2 tires
GM drilled rotors w/Hawk Pads
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post #6 of 7 (permalink) Old 07-03-2006, 08:02 AM Thread Starter
 
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ok thanx. A friend of my has a red ss and he took his car to the shop and the looked at the fuel injector and it was full of carbon. will gm since him a letter telling him he needs to change his driving habbits. they told him to drive it faster
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post #7 of 7 (permalink) Old 07-03-2006, 09:07 AM
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Well, all of our cars run rich, and that is GM's solution to keep the engine safe. Thats what we have to deal with until you do a custom tune on the car. You are gonna get smoke from the large injectors. Driving a little faster will help clear out the fuel system by allowing everything to work at full tilt, but it will not solve the black spots on the back.

We need more boost!

K&N CAI, GMPP exhaust w/XTC 3" d-pipe,
Ported stock exhaust manifold, B&M Shifter
Stage 2 w/2.8, DC Sport sturt brace,
Torque brace, CAB's, poly Trans mounts,
225/40/18 BFG KDW2 tires
GM drilled rotors w/Hawk Pads
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