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Thread: No black smoke?

  1. #1
    Join Date
    Jul 2020
    Location
    Montana
    Posts
    389

    Default No black smoke?

    Weird! This 6.5 Optimizer I installed with a 4911 injection pump and 3-7 psi lift pump does not blow any black smoke when I accelerate heavy. Is that good? Or is fuel too lean?

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Default

    Turn up the pump. It should puff a bit of gray/black until the turbo spools. There is no "lean" in a Diesel. The intake air is essentially unrestricted, so less fuel is just less power (and/or smoke). It doesn't have nearly as restrictive A/F ratio requirements as a gasser.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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