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Compass engine knocking at 1200RPMs

Discussion in 'Compass' started by wayne, Apr 28, 2017.

  1. Apr 28, 2017 at 9:07 AM
    #1
    wayne

    #1
    wayne [OP] New Member

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    wayne
    2009 jeep compass has knocking sound that: after start up you bring rpm up to 1200 and the knocking starts for a few min. then it goes away. Then you have to wait until the next day so it will do it again. I am thinking cam phaser. Has anyone seen this before?
     
    wayne, Apr 28, 2017
    #1
  2. Apr 28, 2017 at 10:04 AM
    #2
    OFFGRID

    #2
    OFFGRID Well-Known Member

    Joined:
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    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    My 2009 Chevy truck does this now at 115000 miles. Sounds like lifters to me Its almost like it now has to pump oil up to the lifters to get them quiet. If it is a hard knocking sound and not a soft tap tap tap, it could be detonation. Try running a high octane fuel for a couple of tanks and see if it goes away. Also check your spark plugs and make sure that they are dry.
     
    OFFGRID, Apr 28, 2017
    #2
    JKBob 25, Bob and Shane72 like this.
  3. May 2, 2017 at 3:53 AM
    #3
    wayne

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    wayne [OP] New Member

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    What I found was the cam phaser. I changed the oil and drove it for about 50 miles and changed it again using a synthetic and adding a BG product called MOA or motor oil additive cleared it up. No more knock. Might come back if oil isn't changed on time.
     
    wayne, May 2, 2017
    #3
  4. May 2, 2017 at 6:19 AM
    #4
    OFFGRID

    #4
    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
    #317
    Messages:
    2,018
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    Thanks for that. My truck also has a VVT. I'll try that and see if it quiets it.
     
    OFFGRID, May 2, 2017
    #4
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