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Detonation on #2 only, 2008 Jeep Liberty 3.6L

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here Detonation on #2 only, 2008 Jeep Liberty 3.6L

This topic contains 2 replies, has 2 voices, and was last updated by Tom Prebelich Tom Prebelich 6 months, 1 week ago.

  • Creator
    Topic
  • #989415
    Tom Prebelich
    Tom Prebelich
    Participant

    My daughters Jeep Liberty 3.6L w/ 73,500 miles (purchased used @3 months ago) got a P0300(random misfire) and P0302(misfire #2). I replaced all plugs as the gap was around .060+ on all of them and this is when I found the #2 to have a bad detonation issue. All plugs looked good, maybe just a little lean but still “normal” except #2. It was dry, with a “rusty” to ash white tint and dry buildup down inside. There is also black pepper specks all over. I scoped the cylinder and there is a lot of dry build up also, not oily at all. I checked compression on #1, #2 and #4 and all were @170psi. I also changed the coil on #2 also. And just for the heck of it I replaced all the lifters and bank #2 head just because I know this is a common issue on that engine.

    After @50 miles on the new plugs and coil I took #2 out and it was “peppered” and white ash in color. The other plugs still looked like new except for a tiny bit of carbon.

    What am I missing or what could be wrong?

    • This topic was modified 6 months, 1 week ago by Tom Prebelich Tom Prebelich.
Viewing 2 replies - 1 through 2 (of 2 total)
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  • #989417
    Nightflyr *
    Richard Kirshy
    Participant

    Just taking a shot in the dark here..
    Possible faulty or partially clogged fuel injector

    #989437
    Tom Prebelich
    Tom Prebelich
    Participant

    Richard,

    I appreciate your reply!
    That is what I changed this morning. I think that’s what it’s going to end up being. I know it was working but could have a clog or not working 100%. I will update in a couple weeks when my daughter gets back from college.

Viewing 2 replies - 1 through 2 (of 2 total)

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