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  1. M

    2007 Yukon Denali Intermittent Crank No Start

    I ended up biting the bullet on a new Acdelco TB and a Delphi MAF. Starts easier and idles smother. I tried to get it to shut off like I did last time but idle held steady like it's supposed to. inj duty cycle is 1.4 to 1.5, TPS % is lower, STFT are near zero and responding normally. I will...
  2. M

    2007 Yukon Denali Intermittent Crank No Start

    Higher the frequency, higher the mass flow. Really no need to convert. It will just be a calculated value anyway.
  3. M

    2007 Yukon Denali Intermittent Crank No Start

    ECT and IAT are both on the attachments I posted... They're good.
  4. M

    2007 Yukon Denali Intermittent Crank No Start

    UPDATE!!!! - I had some time to troubleshoot this today. I was actually able to replicate the stalling and I made it stall right at my house so it worked out great. I had my HP Tuners logging when it stalled, when I unsuccessfully tried cranking, and then when I tried cranking successfully...
  5. M

    2007 Yukon Denali Intermittent Crank No Start

    So yours would stall and then not start after coming to a stop?
  6. M

    2007 Yukon Denali Intermittent Crank No Start

    Thanks - I'll check that one
  7. M

    2007 Yukon Denali Intermittent Crank No Start

    Whats the most common scanner that has that capability? Where do I start?
  8. M

    2007 Yukon Denali Intermittent Crank No Start

    Ok so I cleaned the front pass ground and tested the negative cable. All good. It just died again on me last night. The problem appears to be more frequent now. It'll start idling lower and lower struggling to stay running at stops. Then the next tine I stop, it dies and won't start. Could...
  9. M

    2007 Yukon Denali Intermittent Crank No Start

    Thank you! I'll work on all of this
  10. M

    2007 Yukon Denali Intermittent Crank No Start

    It was an oem camshaft sensor. Thars not the issue. No info on grounds?
  11. M

    2007 Yukon Denali Intermittent Crank No Start

    Definitely not giving me torque converter symptoms. Is there a diagram showing all the grounds on a 07 yukon denali? I found the one on the firewall. That was broken when I bought it so I replaced it. That was before these crank/no start experiences. What other grounds should I find and...
  12. M

    2007 Yukon Denali Intermittent Crank No Start

    No, I never cleaned the throttle body. Has 220k miles on it. Should I clean or replace? Whats the goal with cleaning and could it cause a crank but no start condition?
  13. M

    2007 Yukon Denali Intermittent Crank No Start

    Whats a TC? I'm thinking about replacing the throttle body but I'd hate to replace yet another part that doesn't need replaced
  14. M

    2007 Yukon Denali Intermittent Crank No Start

    You're correct - no fuel filter. Definitely not a clogged cat. No codes for inefficiency and it has tons of power when driving. It was only that one time it acted up while driving. Didn't act like a clogged cat or obstructed exhaust. almost like a ground or something was weakly holding on
  15. M

    2007 Yukon Denali Intermittent Crank No Start

    Just remembered that one day while driving it was acting like it had no power. It kept running and driving but I slmost had my foot to the floor just to go up a little hill. It didn't die on me that day but definitely wasn't right. Could a very dirty fuel filter cause this? I never...
  16. M

    2007 Yukon Denali Intermittent Crank No Start

    Just a generic little obdii to read codes but I have hptuners. I'll try hooking that up to see if I can find anything else. I'm going to go over all the grounds on it to make sure theyre good.
  17. M

    2007 Yukon Denali Intermittent Crank No Start

    I tested fuel pressure when it would not start. 52psi. No CEL when it does this. Only happened twice and completely random. Both idling in gear tho. itll seem to start idling rough and then stall and not start. has less than perfect idle normally too. could it be the idle air control...
  18. M

    2007 Yukon Denali Intermittent Crank No Start

    After about 2 hours of it not starting, it magically starts. It only did it twice. It'll start and run fine now. No long crank, nothing. I can't make it not start so troubleshooting whether it has fuel or spark is tough. If it was that easy I wouldn't be posting here
  19. M

    2007 Yukon Denali Intermittent Crank No Start

    I replaced the cam sensor when I bought it a few months ago. it was actually running without one but would crank longer than usual and then start or would not start but then fired right up when the key was turned the second time. replaced with a gm sensor. those are classic cam sensor...
  20. M

    2007 Yukon Denali Intermittent Crank No Start

    HELP! I have a very nice 07 denali that left me stranded with a crank - no start issue. Did it twice now. It will crank and sputter sometimes but no codes snd good fuel pressure. I replaced yhe fuel pump after the first time it did this. Any ideas? All the posts I see are for no crank no...

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