N* 4.6 Bad Compression, Help Please

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Northstar Engines and System Technical Discussion Discussion, N* 4.6 Bad Compression, Help Please in Cadillac Engine Technical Discussion; Hello All, I have a 2004 Deville (135,000 miles) w/ a 4.6 N*. It was running very poorly and throwing ...
  1. #1
    Hawk996 is offline Cadillac Owners Member
    Automobile(s): 2004 Deville
    Join Date
    Apr 2013

    N* 4.6 Bad Compression, Help Please

    Hello All, I have a 2004 Deville (135,000 miles) w/ a 4.6 N*. It was running very poorly and throwing a misfire code on cylinder 2. I did a compression check and have 60 lbs on 2, 80 lbs on 4, 80 lbs on 6 and 120 lbs on 8. All the odd cylinders are 150 lbs or over.

    I am a decent back yard mechanic and have no problems changing timing belts, water pumps etc.. but feel like this may be beyond my scope. I am currently living in a pretty rural area and none of the garages around will touch a N* I called and spoke to a guy from N* Performance and he said that I need to pull off the valve cover and see whats going on. His bet it stuck lifters? I have never had a head off an engine before but my first thought was head gasket?

    Just trying to figure out my best option for the next step I guess. Im in NE Pennsylvania and close to Southern tier NY / Binghamton, NY if that helps, maybe someone can recommend a Cadillac garage. I am a bit leery of dealers and obviously am looking to get this fixed as affordable as possible.

    I really like my Cadillac, its near mint body and interior.


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  3. #2
    RippyPartsDept's Avatar
    RippyPartsDept is offline Cadillac Owners 10000+ Posts
    Join Date
    Sep 2007
    Wilmington, NC

    Re: N* 4.6 Bad Compression, Help Please

    JoeTahoe is north of you in NY .... he's done about 4 of these jobs ... let me see if I can find him for you

  4. #3
    JoeTahoe is online now Cadillac Owners Fanatic
    Automobile(s): 2001 GMC SLT,Tahoe, Malibu LTZ, 99 STS studded with NP
    Join Date
    Jul 2010
    Central, NY

    Re: N* 4.6 Bad Compression, Help Please

    I sent you a PM Hawk

  5. #4
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
    Automobile(s): 98 eldo/KD54 w/N37,T96,QA1,D55,DS3,U1Z. U3R next
    Join Date
    Apr 2010

    Re: N* 4.6 Bad Compression, Help Please

    There is a TSB about this possible condition......

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