Thread: black smoke
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Old 12-06-2006, 07:52 AM   #2
GStream40
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Join Date: Nov 2005
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Black soot from a diesel is normal to a point. It is usually caused by a over fuel condition or lugging the engine. In other words too much foot on the pedal trying to get up to speed or too much fuel going up a mountain.

Another thing I found is if one is using the "Economy" mode on the Allison tranny in hilly terrain the engine will produce more soot since the tranny doesn't downshift as fast and lugs the engine some.

But the late model diesel engines with the electronic controls don't produce near the soot as the older diesels did.

We usually have a dirty toad on a long trip that looks like a black soot exhaust coating. Our C7 CAT doesn't get the toad as near dirty as the '03 GS with the 3126 CAT did.

What engine do you have in your TM?

Help this helps answer you question.

Ron
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