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  1. ic455

    2003 Yukon issues - SOLVED

    Thanks everybody for the input!
  2. ic455

    2003 Yukon issues - SOLVED

    SKF, I think, yeah just a waste of 15 bucks. Thanks for all the input!
  3. ic455

    2003 Yukon issues - SOLVED

    SOLVED! Swapped in cam sensor out of my 04 and starts every time. New SKP sensor from rockauto is garbage.
  4. ic455

    2003 Yukon issues - SOLVED

    No change if it's still hot. Looks like it has to cool for awhile before it will restart.
  5. ic455

    2003 Yukon issues - SOLVED

    Yes, every time the same 2.
  6. ic455

    2003 Yukon issues - SOLVED

    Update: Still getting P0342 and P0343 and having trouble with hot starts, for now letting it cool for about 20 minutes seems to let it start.
  7. ic455

    2003 Yukon issues - SOLVED

    When it actually starts and runs, I can't complete CKP relearn; when I'm on "accelerate to full throttle" screen, (fuel cutoff) the fuel never cuts off, I can rev to 6k. Scanner never recognizes "full throttle". Edit: I had to hold brake pedal while doing relearn, worked this time.‍♂️
  8. ic455

    2003 Yukon issues - SOLVED

    Swapping B1 S2 into the S1 position cured the trim problem. Now working on intermittent no start. Looking at crank sensor harness as possible cause. Going to trace from sensor to pcm today, will update.
  9. ic455

    2003 Yukon issues - SOLVED

    Ok, update time. I swapped the bank 1 upstream and downstream O2 sensors and ran the truck, even drove down the road with a/c on. Fuel trims normal. O2 data normal. Now trying to tackle what apparently is an unrelated problem: crank, no start. This has been ongoing during this whole...
  10. ic455

    2003 Yukon issues - SOLVED

    Exactly! The lack of any codes related to fuel is what has had me stumped.
  11. ic455

    2003 Yukon issues - SOLVED

    Man, that's what I was thinking, too! I'm going to try replacing the B1 upstream and see where that gets me first, and go from there.
  12. ic455

    2003 Yukon issues - SOLVED

    Here's the O2 data that goes with the fuel trim data.
  13. ic455

    2003 Yukon issues - SOLVED

    Here's a YouTube link to the video
  14. ic455

    2003 Yukon issues - SOLVED

    I have some videos of my scanner but I can't upload mp4 I guess. Suffice to say I've discovered that the trims go positive LT and ST on bank one only. So positive that the graph line nearly disappears at the top. If I unplug any one injector on bank 1 it smooths out. So it appears I'm over...
  15. ic455

    2003 Yukon issues - SOLVED

    Y'all are awesome, I will get the exact readings shortly, seems like everything hits the fan at once. The brands on parts I've replaced are mostly chinese‍♂️ but swapping things with my 04 yields the same results(on the stuff I've swapped, which hasn't been everything...yet)
  16. ic455

    2003 Yukon issues - SOLVED

    Man I'm dying at that censorship!
  17. ic455

    2003 Yukon issues - SOLVED

    The short terms are in closed loop, it appears to be adding fuel. I don't recall the long term numbers, they were fairly steady though. Also of note, the fuel pressure is about 44 at idle(higher than my 04), but most interesting is after running about 30 minutes I shut the engine off and...
  18. ic455

    2003 Yukon issues - SOLVED

    232000 miles, all new parts done while chasing this problem. Throttle body not cleaned. Short term fuel trim goes from a low and flat baseline on bank 1 to high and flat, bank 2 similar. I should've recorded the event but didn't. Haven't tried disconnecting the MAF. I've tried to run CKP...
  19. ic455

    2003 Yukon issues - SOLVED

    Hi all, new here. I've searched and not found anything, so here's my situation: 2003 Yukon 5.3 flex fuel. Wife complained of near stalls at stop signs intermittently with hard starts after shut down. Was already about to do valve cover gaskets, so did those, pcv valve, plugs and wires...

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