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  1. Y

    2006 Yukon Denali xl (6.0L) intermittent start

    I Agree with you about the check valve. It just seems so crazy that I would get too bad fuel pump’s in a row. The first one was a After market And the one that’s in there now is from the dealer. I’m not sure if it’s possible to even check that or diagnose it what do you think Sent from my...
  2. Y

    2006 Yukon Denali XL (6.0L) Intermittent Start

    I have done the relearn two times since I’ve had the vehicle. I’ll check again but I believe when I crank the security light is off. The security light comes on and stays on when I turn the key But do not started yet. I was thinking it might be an issue with the pass lock system but I don’t...
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    2006 Yukon Denali XL (6.0L) Intermittent Start

    Thanks for the input. I’ll have to plan to do in the next week or two. The interesting thing is I would think that even if I did have a small leak if I cycled the key three times and pressurize the system three times and then try to start it should start. But I will tell you I’ve tried that and...
  4. Y

    2006 Yukon Denali xl (6.0L) intermittent start

    Is there a difference between the ignition switch in the ignition module? When I put the new PCM in I looked at all the connection points and from what I could see they all look good. Sent from my iPhone using Tapatalk
  5. Y

    2006 Yukon Denali xl (6.0L) intermittent start

    The pressure when cranking is 55 psi Sent from my iPhone using Tapatalk
  6. Y

    2006 Yukon Denali xl (6.0L) intermittent start

    I was going to try today hooking the gauge up turning the key on and pulling the fuel relay to see what happens. Sent from my iPhone using Tapatalk
  7. Y

    2006 Yukon Denali xl (6.0L) intermittent start

    So I got a better fuel gauge then I was using to make sure it was 100% correct.I know with the key in the off position it does not bleed fuel pressure. With the key in the on position it does slowly. Sent from my iPhone using Tapatalk
  8. Y

    2006 Yukon Denali XL (6.0L) Intermittent Start

    They are all brand new injectors. But I know that doesn’t mean one isn’t bad. What’s the best way to check for that? Sent from my iPhone using Tapatalk
  9. Y

    2006 Yukon Denali XL (6.0L) Intermittent Start

    Yes when I turn the key it will always crank. It is 50/50 if the problem will happen. Half the time it starts normal with no problem. There are times when cranking that you can tell it is sputtering and trying to start. This is rare. The normal is -turn key cranks but does not start . -turn...
  10. Y

    2006 Yukon Denali xl (6.0L) intermittent start

    HELLO ALL I HAVE A INTERESTING PROBLEM ON MY 2006 YUKON DENALI XL (6.0L) THE TRUCK HAS A INTERMITTENT START PROBLEM THERE IS NO RHYME OR REASON WHEN IT START OR DOES NOT START. WHEN IT DOES NOT START ON THE FIRST TIME IT ALWAYS START ON THE SECOND TIME. LET ME TELL TELL YOU WHAT I HAVE...
  11. Y

    2006 Yukon Denali XL (6.0L) Intermittent Start

    HELLO ALL I HAVE A INTERESTING PROBLEM ON MY 2006 YUKON DENALI XL (6.0L) THE TRUCK HAS A INTERMITTENT START PROBLEM THERE IS NO RHYME OR REASON WHEN IT START OR DOES NOT START. WHEN IT DOES NOT START ON THE FIRST TIME IT ALWAYS START ON THE SECOND TIME. LET ME TELL TELL YOU WHAT I HAVE...

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