Do you have any oil leaks? I have had cars that the oil that has seeped out of the value covers and when they've been run hard, the oil starts to burn and smoke. Also, if the oil has been changed recently or oil added was it spilt on the exhaust or the engine?
Just a few possibilities.
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Blue Jeep Club Member #4
92 Canyon Blue Wrangler YJ 4.0L - with some fun goodies