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Old 09-24-2013, 11:29 PM
Cornell Cornell is offline
LawnSite Senior Member
Join Date: Jul 2010
Location: MN
Posts: 532
Smoke at startup for a diesel is normal, even blue smoke on pre-tier 3 and tier 4 emissions.

Reason is diesels are awfully inefficient on cold startups until they get up to operating temperature.

Blue smoke means you are burning oil so monitor that. My 2007 Duramaxs have a little blue smoke at start up. One is at 46k miles and the other 110k, but I have deleted the grid heaters and EGR's on both.

Black smoke is partially burned diesel.

White smoke is unburned diesel, usually an injector issue.
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