Challenger Hellcat Rough Start (after fuel rail recall performed.)

Discussion in 'SRT Hellcat Maintenance' started by TallCool1, May 6, 2015.

  1. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Bummed :( Hellcat is sick after fuel rail replaced per recall.

    Symptom: Engine cold. Start car. Fires up for 1 second, immediately sputters, almost dies; that lasts 2...3 seconds then it recovers, warms up and runs normal. (Doesn't do this after car's been on for a few minutes even from a cold start. No misses detected after this happens. No DTCs set (none found on my machine or Witech at dealer. Weird.

    All injector and sensor connections checked and re-checked. Listened to injectors using stethoscope, all sound normal.

    Fnkychkn suggested try to pressurize fuel system prior to start; that is next test. From there back to dealer. Unfortunately my original rail assy. with injectors already returned to FCA. So next steps after seeing if pressurizing fuel system for a few seconds to see what that shows will be to return to dealer, remove fuel rail assy, clean, inspect, re-install. Then replace (2nd time) and / or conduct fuel rail pressure test. And data log.

    With no DTC's set could be a challenge. Of course right in front of show weekend. Planning to go to show then dig into it next week. Maybe sooner if I have time I will remove rail / injector assy. myself clean re-install and see if that does anything.

    Suggestions ideas welcomed. (My Dodge tech is an ace he did install by book I was there I know he can find it but appreciate your thoughts; no one on this forum likes a sick kitty...)
     
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  2. hellcat1

    hellcat1 Gold Member

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    I thought the fuel system charged itself once you opened the drivers door??
     
  3. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    No.

    Depress starter button twice minus brake, you will then hear fuel pump. You will barely hear it during normal start.
     
  4. Themip

    Themip Gold Member

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    my charger does this every morning. It sputters so bad 2-3 times almost sounds like it is going to shut off. If you press the start button twice as posted above without break on then you hear the fuel pump running to pressurize system and fixes the issue. Sounds crazy with exhaust cutouts open almost like the biggest cam ever lol.
     
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  5. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Your sputter description sounds just like what my car is doing. It never did it once prior to the fuel line / rail / injector replacement. 1287 miles on car. Recall performed < 150 miles ago. Appreciate the feedback thanks. (And when will you post some revs or ??? with the dumps open? I'm installing NoWeeds but not until next week.)
     
  6. Themip

    Themip Gold Member

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    here is my cat on the dyno with cutouts open
    Charger Hellcat Dyno SRT Hellcat Forum

    startup and idle


    inside car with cutouts open


    i do still need to get video outside the car revving and doing a few flybys.

    but yea i never got the fuel rail recall so they must of done mine before i got it delivered. But definitely noticed the rough idle on cold starts where it sounds like it is going to stall out then comes back up to rpm. Some days it will do it 3-4 times if my cutouts are open and it sounds like a wicked cam haha.
     
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  7. solo7777

    solo7777 SRT Terminator Hellcat Car Club Western Regional President HCC Charter Member

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    I would try pulling the fuel pump relay(72) (in the trunk), starting till it dies and replacing the relay. Start again till running...who knows? Unless somehow one of the injectors somehow got dirty or something or an o-ring isn't seated properly? Just a wild guess....
     
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  8. TIGwelder

    TIGwelder SSDD

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    Air in rails? Do you have a pressure gauge with a releaf valve/drain hose?

    You could see what the pressure is before you start and then hit the bleed into a container while running and see if there is air in the system.
     
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  9. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Not my own but appreciate your ideas THANKS!
     
  10. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Appreciate the share!
     
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  11. solo7777

    solo7777 SRT Terminator Hellcat Car Club Western Regional President HCC Charter Member

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    Sounds pretty mean!
     
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  12. Daktur

    Daktur Rookie

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    Just got delivery of my hellcat challenger and experience the same issue on almost every start up after a few hours. In fact, she won't even fire until the engine has been cranking for 2-3 seconds. I hope this issue can be resolved by the fuel rail recall.
     
  13. B5 Blue

    B5 Blue Platinum Member

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    What happens if it sits for days is it worse?
     
  14. Daktur

    Daktur Rookie

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    Haven't had it for more than a day!!!
     
  15. Daktur

    Daktur Rookie

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    However as per earlier recommendations on this forum, letting the going to accessories and then ignition allows the fuel pump to pressurize the system, then cranking her after a few seconds solves that problem pretty much.
     
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