Question about GMC K1500

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When the truck is started it causes a vaccuum sucking the injector harness and both gas lines into the upper intake plenum and cause a major air leak. the rubber O ring was changed and it did not stop the problem

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  • Jeremy W.
    Jeremy W. Mar 19, 2011

    Year, make, model, engine size?

  • mainemankilg Mar 19, 2011

    its a 1996 gmc 1500 with a 5.0

  • mainemankilg Mar 19, 2011

    1996 gmc 1500 with a 5.0

  • Jeremy W.
    Jeremy W. Mar 19, 2011

    are you sure that connector is pulled all the way up into the intake plenum? Sometimes it helps to lubricate that o-ring with some di-electric grease before assembly. Di-electric is an awesome rubber o-ring lubricant!

  • mainemankilg Mar 19, 2011

    yes it was pulled all the way into place. when you go to start the truck up it sucks everything back down out of the plenum and into the bracket under the plenum

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  • GMC Master
  • 5,332 Answers

Than you'll have to pull the plenum back off and see what the problem is. You don't have something mounted correctly. That connector (which is the CPI unit) should hold steady as the intake plenum is installed and be in the correct position after all the bolts are tightened down. If it can fall down below the opening that there is a problem with how the CPI unit is mounted.

Posted on Mar 19, 2011

  • 1 more comment 
  • mainemankilg Mar 19, 2011

    everything is mounted correctly i even had my machanic come to my house and pull it back apart and check everything is fine. the cpi is mounted correctly. its not falling below the opening. it is being sucked down into the bracket that is undernieth it. it only gets sucked down in about a 1/4 inch.

  • mainemankilg Mar 19, 2011

    when you start the engine is when the cpi is sucked down. it acts like there is a major vaccum problem

  • Jeremy W.
    Jeremy W. Mar 19, 2011

    If its going down that far than there is a problem with the bracket or how it is mounted. The is full vacuum in the intake plenum when the vehicle is running at idle trying to **** everything into the intake plenum. The bracket is what holds the CPI unit up and in place.

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