No power black smoke 2001 6.6 duramax

SOURCE: abs sensor

there is more than likely a piece of rust stuck to one of the front abs wheel speed sensors. this happens during brake service sometimes.

SOURCE: 2004 duramax black smoke and sputtering when

Black smoke means "fuel not being combusted" or "runnig rich". I have no doubt you have gasoline. Your spark may not be burning the gas. Is there a check eng lite? If EGR was sticking, you would probably get a check engine light for this. If your truck has a Vortec design, I would find out if you need a new "spider". What is your mileage? Are you due for a tune up? What spark plugs are you using? Vortec? "Not all the time" sounds like intermittent. When was the last time you changed the fuel filter? Can't hurt to change this. This would be the actaul starting point for me. I would change the fuel filter which is under the driver under the chasis. You will need a 16MM and a 20MM. USE ONLY LINE WRENCHES. You may need a fuel line disconnect kit too depending on your model. Notice it only happens on acceleration? that is when you are forcing even more fuel thru the system, but not enough of a fuel stream make cause sputtering and when the fuel comes thru too rich that would be the black smoke. It sounds like you have the 2 extremes. is there afuel regulator on your vehicle? If so, you may need to change that too. Good luck.

SOURCE: location of speed sensor 2001chevy silverado 3500

Depending on what transfer case model you have,some have one sensor and some have 2.They will both be on the back of the transfer case.They will be on the tail shaft of the transfer case.The one with 2 sensors has one on the left and one on the right.Hope this helps.Good luck.

SOURCE: location of speed sensor 2001chevy silverado 3500

above were your electrical plugin plugs up on the rear left of transmission. that is your output shaft speed sensor.

SOURCE: smoke when idiling

U need to replace your valve stem seals.