Search results

  1. M

    Warm Start Problems

    Well…long story short it was 3 bad (brand new) injectors that were leaking. Finally got them warrantied and replaced. Low and behold it works.
  2. M

    Warm Start Problems

    Just throwing it out there so please someone chime in. What about the fuel pressure sensor on the fuel line under driver side? What I read states it feeds the ecm the info for pulse width and cycle and all that. Scanner has shown rail pressure dropping where mechanical gauge shows 40 something...
  3. M

    Warm Start Problems

    Coolant temp is normal. Replaced sensor as well. Just did it twice today cranking after it sat for a couple hrs. Put pedal to the floor and it cranked right up.
  4. M

    Warm Start Problems

    Ok. Last question hopefully….I have a sensor on order. If you put the pedal down for “clear flood mode” would it crank right up?
  5. M

    Warm Start Problems

    Would yours smell like fuel when you tried cranking like in the video?
  6. M

    Warm Start Problems

    I’m pretty sure it’s the factory sensor but I’m not sure. I’m not the original owner. Seems like a pita to change too.
  7. M

    Warm Start Problems

    Pretty much. Sometimes it will catch on first crank and sputter and then run. Second crank always cranks right up.
  8. M

    Warm Start Problems

    Starting back at this thread. Replaced the one injector believed to be bad. Did not fix the issue. Took it to a specialist that does automotive electric and they’re unable to see enough live data in the few seconds it acts up to give me an answer and I can’t leave it. My thought was maybe the...
  9. M

    Warm Start Problems

    It’s possible and I’m unsure how to go about finding the ground in the harness. But the injectors are warrantied, I can get another through that warranty.
  10. M

    Warm Start Problems

    Found this on another thread. Anyone think this could be an issue I should check?
  11. M

    Warm Start Problems

    You’re telling me man! I thought I had the problem solved. Everything I’ve seen and videos similar to mind show the fuel pump or injectors. Replaced those and still have the issue.
  12. M

    Warm Start Problems

    Unplugged the injector I suspected of leaking and it starts much better. Runs like poop but it doesn’t crank for almost a full cycle like it does normally.
  13. M

    Warm Start Problems

    My pressure is great at cold start, running, etc. but it falls short only after it’s warm and bled down. I do agree though, it’s an issue I thought was solved by replacing the pump. Would anything else be keeping it from building pressure?
  14. M

    Warm Start Problems

    I may try that to see if it’s my issue but definitely not driving on that.
  15. M

    Warm Start Problems

    Yep that’s my dilemma. It acts like it’s flooded and it does lose pressure but everything I’ve done and looked at doesn’t show me where. I have a possible injector I want to warranty as all my plugs smelled like burnt fuel except one. That one smelled like raw gas.
  16. M

    Warm Start Problems

    What about a snap-on scanner? That’s the only one I have access to. Originally put in a Delphi pump and now the warrantied Delphi is a carquest. Fuel pressures are fine with key on engine off and also when running. After it bled down though to 16-18 psi and then turned key on it would only...
  17. M

    Warm Start Problems

    Can that be done using a scan tool? If not I may have to rely on a shop to do that as I don’t have the tools for it aside from the scan tool.
  18. M

    Warm Start Problems

    Also, before getting the AFM turned off I was getting a p3400 code for afm malfunction. May be related, may not be.
  19. M

    Warm Start Problems

    Thanks for all the suggestions. I too have thought control module but having it programmed to the vin doesn’t sound fun or cheap. One spark plug smelled like raw fuel where the others all smelled like burnt fuel. So that could be my issue. We’ve tried checking grounds in the engine bay and...
  20. M

    Warm Start Problems

    Updating this. Replaced fuel pump again since it has a warranty. Didn’t change anything. It was, however, a different looking pump than originally put in. Swapped MAF from my wife’s Yukon and nothing changed. When cranking, the dash shows volts going below 12. After firing it sits around 14...
  21. M

    Warm Start Problems

    So my wife has a 2011 Denali, I swapped her MAF with mine and it made no difference in starting. Hers runs perfectly normal so I assume it’s a working MAF.
  22. M

    Warm Start Problems

    I’ve seen IAT on a scanner at idle and key off engine warm. It read 107 when outside temp was 81. Where does it get IAT at? The MAF sensor? D, I’ll check that out. I was curious about the module, but wasn’t certain. The pump did have a broken bowl which I rigged with my old bowl. That may or...
  23. M

    Warm Start Problems

    My apologies. It’s a 09 Yukon SLT, 2wd. 198k miles. 5.3, vin code 3, flex fuel.
  24. M

    Warm Start Problems

    Good afternoon all. I’m hoping someone here can guide me in the right direction. It’s a long one, but I’m gonna give all info and things I’ve tried. My issue is I’m having difficulty starting when warm. When it’s cold, it fires right up. When I put my foot down to clear flood mode it will...

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