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Communities > Diagnostics > USA Cars > Engine stumble with no codes or misfires
Engine stumble with no codes or misfires

1388 Views 7 Replies Latest reply: 2021-03-19 22:36:15


  •   Level 1   
    (5) points
    DIYsam
    2021-02-15 00:20:12
    2005 Ford Escape 3L V6 
    Engine developed a stumble that will never recover until you take your foot back off the accelerator. 
    It will stumble while driving above about 2000 RPM or sitting stationary in park/neutral above about 3000 RPM.
    At idle and lower RPMs the engine runs like a top but it will fall on its face if you stick your foot in it.
    There are no stored or pending codes and the misfire data shows nothing significant.
    Looking at live data, everything appears to be within the ranges specified but I am no expert.

    Any suggestions on sensors and values I should be looking at to better diagnose the problem

    Tags: no_code, , stumble, , no_misfire

    Reply

  •   Level 2   
    (30) points
    frankiedon

    2021-02-28 00:14:31 (Reply to:DIYsam)

    Hi Did you check the O2 sensors?
    Reply

  •   Level 10   
    (7578) points
    witsend

    2021-02-28 01:43:00 (Reply to:DIYsam)

      Fuel Rail pressure, restricted exhaust or air filter, Dirty MAF sensor , throttle position sensor, intake runner control acuator?
    Reply

  •   Level 5   
    (243) points
    FX4

    2021-03-11 02:22:24 (Reply to:witsend)

    Don't forget coil pack !
    Reply

  •   Level 1   
    (3) points
    mike

    2021-03-12 00:11:13

    Spark plug's? Fuel filter? You've done the routine stuff?
    Reply

  •   Level 2   
    (17) points
    root1

    2021-03-15 19:24:10

     Only way to diagnose is to pick a system and verify it's operating correctly. I have owned (and repaired) a few of these first-gen Escapes w/ the 3.0 V-6. As someone has stated, coil packs on these are prone to failure and cause horrible misfires. My only word of caution is DO NOT buy the cheap coil packs off Amazon as a long term solution. Either buy the Motorcraft or Denso (Rock Auto has the best prices). Yes, they are spendy but the cheap ones can damage things further. Buy a cheap set if you want to wing a part at it but don't rely on them as a long term replacement. And only use Motorcraft spark plugs (cheap at Rock Auto as well).
    Reply

  •   Level 3   
    (68) points
    Tecknica

    2021-03-19 18:07:59

     I am with Root1 on this one.

    But don't forget to remove the nut securing the engine harness at the ECU. Do a wiggle test to see if you can duplicate the stalling. I seen one where the wire harness had two broken wires at that location.
    Reply

  •   Level 7   
    (1593) points
    promaster

    2021-03-19 22:36:15

    .

    Reply
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