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06 lurching/hesitating/surging/searching when accelerating uphill.

Discussion in 'Technical Chat' started by Sandman614, Jan 18, 2014.

  1. Jan 18, 2014 at 4:38 PM
    #1
    Sandman614

    Sandman614 [OP] LRGRNR

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    Anyone know what this could be? When climbing hill/mountain roads my truck seems to "shift" up and down constantly until I crest the hill or give it more gas to actually shift. I use the quotes around shift the first time because the rpms don't move during the "shifting". It feels like I'm feathering the gas pedal. I believe it to be the Torque converter locking and unlocking. Why would it do this?
    2006 4x4 auto sr5, 120k miles, no cel codes.
     
  2. Jan 18, 2014 at 6:22 PM
    #2
    Black Pipe

    Black Pipe Well-Known Member

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    has this guy been driving your truck?
    [​IMG]

    ~Black Pipe
     
  3. Jan 20, 2014 at 9:00 AM
    #3
    Sandman614

    Sandman614 [OP] LRGRNR

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    :) bump for an actual answer/suggestion?
     
  4. Jan 24, 2014 at 2:40 PM
    #4
    33yrsoftoys

    33yrsoftoys Well-Known Member

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    Hey sandman, as long as everything else acts normal don't get too concerned, yet. It's probably your converter locking in and out as you said. Its lockup is directly related to engine torque. Poor quality winter BLENDS of gas and air density affect torque. I can't tell more without a test drive but, again, if everything else seems normal, and your fluid levels are good, try a different brand of gas and go from there. Hope this helps.
     
  5. Jan 24, 2014 at 2:45 PM
    #5
    Sandman614

    Sandman614 [OP] LRGRNR

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    It's been going on for a while (months). It's not just once or twice it's pretty continuous (starts to feel like you're in a rocking chair) as long as I'm going up a grade or hard throttle. I can get out of the hesitation if "drop it to passing gear" or downshift on my own. It was pretty bad driving through the mountains in Virginia. The whole weekend trip (shoecreek) I was running Super Unleaded.

    I'll be changing the trans fluid and adding a tranny cooler sometime soon. We'll see if the new fluid changes anything.
     
  6. Jan 24, 2014 at 4:29 PM
    #6
    33yrsoftoys

    33yrsoftoys Well-Known Member

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    Damn, I was hoping that wasn't the case. A trans flush might help. It could be a solenoid problem. Its a pressure switch that's in the valve body(the valves that control the shift) that locks the converter. Most modern autos semi lock or lock the converter in several gears. Do you notice any shifting changes in any other gear?
     
  7. Jan 24, 2014 at 4:36 PM
    #7
    Sandman614

    Sandman614 [OP] LRGRNR

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    Yea. I've noticed it in 4 and D. If the fresh fluid doesn't help I'm afraid it might be clogged cats. Another member had this same issue and that was his solution, after he changed every part on his truck (first gen).
     
  8. Jan 24, 2014 at 4:52 PM
    #8
    33yrsoftoys

    33yrsoftoys Well-Known Member

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    That sure could be with it locking in and out in more than one gear. I'd look for a loss in HP or torque. If your trans fluid looks good(the right color) and doesn't smell, (like burned pork chops), your trans probably isn't the problem. If you can access a trans pressure guage, you could check your fluid pressure. Drag cars have them on their guage pack. That would be another sign it's the trans. I think a HP issue is more probable though. Hope this helps.
     
  9. Feb 19, 2014 at 9:13 AM
    #9
    Chiefs05taco

    Chiefs05taco Member

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    I'm very interested with your findings on this. I've been battling this on my 2005 for a while myself. I've tried everything from plugs, air filters and even ran a can or two of sea foam through it to clean out the intake system and I think that has clogged up the cats good now as I am getting the P0420 code off and on and some very big vibrations at low speed, low RPM, and low throttle. At this point I'm about read to just change out stock manifolds for some long tubes(which I've found is cheaper than OEM replacements) and deleting those first two CATs.
     
    Last edited: Feb 19, 2014
  10. Feb 19, 2014 at 10:09 AM
    #10
    Sandman614

    Sandman614 [OP] LRGRNR

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    Changing the Trans fluid did not help. It was needed anyways but I still have the same symptoms.
    In your case receiving the codes I would look first at the cats. Remember they are under warranty until 80,000 miles. If you are in warranty but would rather have long tunes I would like to get the warranty replacement cats from you.
     
  11. Feb 19, 2014 at 6:12 PM
    #11
    Chiefs05taco

    Chiefs05taco Member

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    I'm sitting at a little over 187,000 miles. So no warranty work for me.
     
  12. Feb 19, 2014 at 6:27 PM
    #12
    Sandman614

    Sandman614 [OP] LRGRNR

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    Bummer. Just changed out my passenger manifold 121k miles, changed the driver side around 98k miles. It's too early to tell if anything is different. I'll let you know.
     
    Last edited: Feb 19, 2014
  13. Feb 19, 2014 at 8:07 PM
    #13
    XamXam

    XamXam Member

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    SpiderTrax 1.25", fogs anytime, yellow fogs, 275/65-17 tires, Tonneau Pro, secondary air-filter removed.
    I pulled secondary filters and reset ecu on 06 4.0L with very noticeable improvement in response and acceleration from 50 mph and up. You will read a lot of people who pulled secondary filters with no noticeable change. It worked surprisingly well for me. With that being said; torque conv., solenoid, cats, and 1001 other issues could be the problem.
     
  14. Feb 23, 2014 at 1:26 PM
    #14
    Sandman614

    Sandman614 [OP] LRGRNR

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    Changing out the passenger side manifold. Trying to rid myself of this surging. 121781 miles
    [​IMG]

    Edit: Pretty sure the surging is gone. I haven't driven to far out of town but around town I don't feel it.
     
  15. May 12, 2015 at 8:06 PM
    #15
    Sandman614

    Sandman614 [OP] LRGRNR

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    Wow, I forgot about this thread. After a lot more searching I tested the fuel pressure and it was very low! I'm almost surprised it was still running. Anyways I replaced the fuel pump with a walbro255 from URD and pressure is back up, codes are gone, and she runs beautifully.
     
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