2004 Mazda Van Repair Question
Mileage: 2,500,000 miles.
Black powder emits only when the vehicle is started after switching off for some time
i would speculate it is running to rich at cold start ups.
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The aircleaner may be blocked, you should try removing and cleaning the element. also check for obstructions in air intake.
Otherwise the auto choke is not working properly and should be re- adjusted
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