black powder emits only when the vehicle is started after switching off for some time

2004 MAZDA VAN
2,500,000 MILES • 6 CYL • MANUAL
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CAPRICORN2369
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  • 1 POST
My Mazda van is emmiting black powder in the mornings and when the vehicle is started after a long rest. The black powder does not emit when the vehicle is in use or running
Feb 11, 2011 at 10:20 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
i would speculate it is running to rich at cold start ups.
Apr 13, 2011 at 12:33 AM
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OZZBO
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  • 4 POSTS
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
Dec 9, 2012 at 4:06 AM
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