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turn the key and get some knocking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by FatBoyBlazer, Mar 24, 2002.

  1. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    rigth when the engine turns over it starts a knocking for about 2 seconds. what could it be??????
     
  2. BILLY RAY

    BILLY RAY 1/2 ton status

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    THAT WOULD BE WHAT CHEVY DO. CRANK IT AND IT KNOCKS ABOUT 3 TIMES AND GOES AWAY. MY 94 SUB. DOES THAT I EVEN PUT A CRANK ,BRGS. AND HIGH VOLUME OIL PUMP IN IT. STILL IT KNOCKS ON COLD START UP. I ALSO HAVE BEEN TOLD THE CPU COULD BE PROGRAMED TO ADD A LONGER CRANK TIME TO BUILD OIL PRESSURE. THE STRANGE THING IS, MY K5 HAS THE SAME MOTOR AND DOES NOT DO THAT. GO FIGURE
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    It could be a Fram oil filter under the hood./forums/images/icons/wink.gif It could also mean that your oil is old and dirty and needs to be changed out.....

    It could also be a sign that you are low on oil.
     
  4. Sparky

    Sparky 1/2 ton status

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    What kind of oil are you using? Sometimes thick oil will cause a little bit of knocking on start up when its cold enough. Also, sometimes people get problems with anti-drain back valves in their oil filters. You might want to switch oil filter brands next time you cange your oil. Read this, it might help. http://www.dorianyeager.com/oilfilterstudy1.html
     
  5. BILLY RAY

    BILLY RAY 1/2 ton status

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    I HAVE USED 10W/30 AND 20/50.
    AC DELCO FILTERS
     
  6. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    It’s got a K&N Oil Filter and Vavoline synthetic blend and I’m due for an oil change
     

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