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  1. #1

    Default bad engine knock! PLEASE HELP!!!

    what's up guys I own a 2005 chevy 2500 reg cab 6.0l with a 7"BDS ntbd. need some help here I've been looking on other forums trying to figure out what my loud obnoxious engine knocking is .
    so I get home on Sunday from work go to bed. wake up Monday morning start my truck up and sounds like a freaking hammer hitting . my oil is good no metal in it. the lubricity is good I don't even know if that's a word but yeah. also I was reading about flex plates bending . I'm pretty sure it's not that. sound like passenger side lower area. checked for broken exhaust studs none are missing ., I'm at a stand still . just weird how this happened over night. . I don't know if it's a bad intake manifold gasket . but yet again I am not loosing coolant. also I was wondering if it could be a injector ?? making piston slap. or bad knock sensor. have the timing off . it's bad enough that it vibrates my whole truck.

    please help I would really appreciate it

  2. #2

    Join Date
    Sep 2010
    everett, massachusetts


    it would be rare to have the engine fail on start up . you do anything to stress out this engine lately ?

    possible coolant leaked into a cylinder and on starting it broke the piston.

  3. #3


    haven't done anything to stress the motor out. she's my only ride and go about a mile and back ever day for work . try not to be too lead footed . gas is $$.
    i checked coolant level and it was perfect and and normal height
    2005 chevy reg cab 2500 6.0l
    bds 7" ntbd high clearance kit
    7%tint 15% Windsheild tint

  4. #4

    Join Date
    Sep 2010
    everett, massachusetts


    pull the plugs see what they look like. could also be injector leaking into a cylinder doing the same thing.

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