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  1. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    Thanks for all the insight. Is it possible to pull the lifters for the #3 cylinder without removing the head just to inspect the rollers? I've also got a borescope to run down the bore and at least examine the cam lobes. This would be something I think I would attempt myself if it could be...
  2. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    I've never pulled a head on a vehicle but there is a first time for everything. If I pulled the head, how would I know if the cam is worn or not? We are talking about .03" on one lobe. How do you measure something round to that kind of tolerance? Also, how do you know I have the updated...
  3. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    So I took my 2012 Yukon to a specialty shop and had them redo the diagnostics. Got a lot more detail this time around but the same diagnoses. From the shop: Note: Checked For Injector Pulse and Spark Pulse. Found Good. Listened To Injector With Stereoscope and And Compared To Other...
  4. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    I got very little information back from the dealer. On the printout they gave me it reads, "PERFORMED COMPRESSION TEST - TEST GOOD AT 135 - PERFORMED LEAK DOWN TEST - LEAKING DOWN ON #3 CYLINDER - HAS INTERNAL PROBLEMS - CUSTOMER DECLINED AT THIS TIME" Needless to say I was underwhelmed by...
  5. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    Good idea. Any brands that you recommend? Should I get a direct fit or a universal and make my own brackets?
  6. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    Interesting. Thanks.
  7. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    Thanks for reading my lengthy post and responding. I'm not quite ready to pull the head just yet but I'm considering it as part of the plan. I think I'm going to pull the intake manifold and valley cover and do some more wear inspection first. My inspection of the rockers and pushrods from...
  8. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    Firstly, thank you very much for reading this long post and responding. I read the thread you shared with interest and it gave me some more things to check inside the motor. I'm not ready to pull the head yet until I do a little more less invasive probing. As for the extended cycle on the...
  9. G

    2012 Yukon XLT with mystery rough idle and misfire codes

    Vehicle History: Purchased in 2012 and driven until Aug 2020 without any significant issues beyond routine maintenance. Oil used throughout is AMSOIL Signature Series 5W-30 on extended change cycles (every 15k-20K miles). All spark plugs and wires changed at 1/20/2018(115K) with AC Delco 41-110...

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