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Engine knocks while cranking to start

Discussion in 'Truck & Equipment Repair' started by Sealer People, Jan 21, 2012.

  1. Sealer People

    Sealer People Senior Member
    Messages: 210

    HI all,

    I have a 1996 chevy 2500 diesel. 4x4.

    Im noticing just today that there is a loud knocking like noise when Im cracking the engine over to start.

    I tried it once or twice, the truck hasnt started, yet, so not sure if the noise continues if when its on.

    Any thoughts ?

    Someone mentioned a vac. pump on another site, not sure though.

    Thanks for your replies.
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,391

    maybe pull the serp belt off and see if it still does it?
  3. bhmjwp

    bhmjwp Senior Member
    from kcmo
    Messages: 309

    Before you crank it again, get under the front and check your harmonic balancer. Make sure there is no play and rubber insert looks ok. It can bust your crank if bad.
  4. Sealer People

    Sealer People Senior Member
    Messages: 210

    Hi Guys,

    I got the started yesterday.
    No problem the noise is gone.

    This morning, I went to start the truck & I noticed it wouldnt start again.
    but as yesterday again, a fuse was blown.

    I know theres a short somewhere but Im wondering what this is fuse for.

    Its in the fuse box in the engine compartment.
    its a 20 amp fuse, and its listed as ECM-B

    Whats is that ?
    That fuse keeps on blowing when I try to start the truck.

    shes trying to turn over but doesnt start.

    Any help would be appreciated,

    re: 1996 chevy 2500 diesel, 6.5 turbo.