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oil on spark #7 spark plug

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by kawierider1990, Jul 22, 2012.

  1. kawierider1990

    kawierider1990 New Member

    I have a 2008 GMC sierra sle with the 6.0 v Max motor. I was driving down the road and heard a loud bang and my truck started shaking and started ticking really really loud. Took it to oriellys and hooked up the computer and it said cylinder 7 misfire. Started changing the plugs and when I took out number 7 plug it had oil on it! If anyone knows anything about this please help!
  2. tbplus10

    tbplus10 Super Moderator Staff Member Platinum Contributor 1000 Posts

    Sounds like you could have dropped a lifter or possibly bent a valve. I suspect you'll have to pull the head to find out the truth, you might be able to do a leak down and compression test to get an idea of whats going on.
  3. billnorman

    billnorman Member

    Compression check is in order. You may have broken a valve. In that case I think the cheapest course of action is a junkya.......Used auto parts recycling establishment and a used engine. They sell for $2000 or so complete, and you may wish to sell yours in that condition.

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