Recent content by Keiterburb

  1. Keiterburb

    2012 Suburban Misfire #5 drama

    One was at idle following the warm up drive, erratic one was while driving throttle moving
  2. Keiterburb

    2012 Suburban Misfire #5 drama

    Yes, but from what I gather so far in my studies The downstream sensor 2 should look much flatter…small adjustments over time. According to my graphs Bank 2 appears worse than bank one with the misfire on#5
  3. Keiterburb

    2012 Suburban Misfire #5 drama

    Would the post cat O2 sensor 2 waveform show a bad/clogged Cat? Just learning how to read the waveforms so I can take another test run. Last test after warming engine and viewing at idle the banks had completely different downstream sensor waveforms
  4. Keiterburb

    2012 Suburban Misfire #5 drama

    Correct, problem was not a symptom of any change. All has been there for some time driving off and on, not my daily, waiting for time to work on it between other work. Always have something to work on here.
  5. Keiterburb

    2012 Suburban Misfire #5 drama

    Noid light on injector 5 was flashing at steady pace without problem and when plugged back in the miss decreased again by half of what was evident when unplugged. Time to start shopping AFM delete kits with a tune I’m guessing
  6. Keiterburb

    2012 Suburban Misfire #5 drama

    Thanks for breaking down your testing methods and recommendations as well as why compression test may give false hope. I feel it’s definitely heading in the direction of bad lifter. My main concern with full AFM delete and cam swap would be knowing the remaining engine life warrants the cost...
  7. Keiterburb

    2012 Suburban Misfire #5 drama

    All new plugs were installed and gap checked as stated in initial post
  8. Keiterburb

    2012 Suburban Misfire #5 drama

    I was able to find the crankcase relearn in the innova 5610 today completed and drive 20 minutes no change. Also, valves would open and close seen in borescope. Unfortunately it doesn’t turn enough for good view of their seated position
  9. Keiterburb

    2012 Suburban Misfire #5 drama

    Could it be not enough intake valve opening due to cam lobe and pulling fuel? We may find out. I am waiting on a noid light and may be out of other options to check
  10. Keiterburb

    2012 Suburban Misfire #5 drama

    All the injectors, plugs, and wires were replaced, gave a rundown of all the usual suspects have been swapped then replaced and am down to wiring other than what has been shot or internal failures
  11. Keiterburb

    2012 Suburban Misfire #5 drama

    After drive here we’re the fuel trims
  12. Keiterburb

    2012 Suburban Misfire #5 drama

    I was able to figure out how to graph some data. Here’s is the O2 difference after 20 minutes on road and parked at idle.
  13. Keiterburb

    2012 Suburban Misfire #5 drama

    Ran a cheap poor resolution borescope down #5 and could see most piston head with seemingly little carbon build up and no visible damage. Ran crank over and both valves came out and reseated.
  14. Keiterburb

    2012 Suburban Misfire #5 drama

    Definitely looking up CASE relearn and checking if I have capability. I have had battery removed for long periods of time between maintenance, even tried throttle body relearn by cycling key on off 3 minutes on/60 off 3 times then idle for 5 min and drive cycle?? Don’t know if correct but...
  15. Keiterburb

    2012 Suburban Misfire #5 drama

    Will see about checking deeper into harness if I can find the schematic, shooting power and ground at injector harness and coil were solid? If I find connector and pins on ECM I could take off and shoot Ohm readings looking for jumping around when wiggling harness wear worn. Got noise light for...
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