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Hey i have 69 camaro,i have done an overhall on the engine about a year ago. For a few months now i have noticed black smugges on the back of my car right above the exhaust pipes and a real light mist of black all over the back of the whole car. I can only get it off with degreaser. I don't know if my car is just running too rich or what. I could use some help. Thanks for your comments!
 

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A colostomy bag might help :D Sorry couldn't help myself.

I'd take your car for a nice hot drive and shut it down as soon as you can without too much idling. Then pull the plugs and see what they say.
 

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Paint the rear panel black. Ha! Do what dnult suggested, I wager you'll find sooty plugs.

Choke work good?
Fuel level too high?
Ignition making the correct voltage at plugs? Good plug wires?
Leaky power valve?
Air filter clean?
Correct plug heat range? Maybe a hotter plug is needed.
 

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Maybe its just powdered rubber from doing the nasty burnouts and hazing the tires. Ha Ha Ha!

Sorry no help from the peanut gallery here but someone had to say it.

Hope you find your problem and fix it before any damage takes place. - Barry
 

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I have had the same problem since my car has been driveable. I attribute the problem to a rich condition. Being down here, we are at 5000 feet or so above sea level. I have jetted the carb down to 67's in the primaries and have left the secondaries alone. Each time I jet down, the condition starts to go away. I may even go down to 66's to see what happens. If you have a Holley, pick up the "quick change jet" kit, it makes things a lot easier.
 

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my 86 2.8L did the same thing, i replaced my O2 sensor and the problem gradually got better over about 2-3 days of driving, and then the problem stopped...



hope this helps and if you know anything about ignition problems help ME
 

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camaro medlin said:
...and a real light mist of black all over the back of the whole car. I can only get it off with degreaser.
I once had a leaking rear seal on my 4 speed and it was leaving a oily mist on the back of my car. Check under the car for signs of trans or engine oil leak.

If leaking bad enough, they will "mist" your back side. Jim
 
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