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Sounds and feels like rumble strips

Discussion in '2007 - 2010 Explorer Sport Trac' started by Flatwatr, February 22, 2019.

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    1. Flatwatr

      Flatwatr New Member

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      City, State:
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      Year, Model & Trim Level:
      2007 Sport Trac Limited
      I am experiencing an pulsing shutter issue which feels like running through the Rumble Strips you might associated with the approach to traffic signal. This shutter occurs at city street speeds usually in the 1500 to 1800 RPM with just the slightest acceleration to maintain say, 35mph. There is an correlating oscillation in the tac at instance of the shutter; the RPM increases slightly. If I accelerate above this RPM, it goes away. If I drop out the OD, the RPM increases and it goes away. The engine idles smoothly, acceleration is great, the gas mileage, although unimpressive, doesn't seem to suffer, but it can evolve into a violent jerking if coaxed. I want to think there is an input error at which point the transmission can't decide to downshift or stay in 6th gear.

      Now that I've described the issue, I'll admit, I've had this addressed three time in the span of 43K to the present 123K. The first two times the issue was corrected by a Ford dealership, and although I can't find the service reports, I was certain the issue was Plug related. This time the technician says the analyzer shows not engine issue and wants to replace the rear shaft assembly. Got any thoughts?
       
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    3. Gee Man

      Gee Man New Member

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      I can't say I have a solution for you, but I have the same model year and mine does the same thing from time to time. So far, I haven't worried about it too much. If I find I'm in an area that it keeps happening because of the speed limit, I just drop out the OD. I'll be curious as to what you find though.
       
    4. Flatwatr

      Flatwatr New Member

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      In my experience, it gets worse in time. Maybe some one with Ford mechanic background will step up with a solution.
       
    5. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      Do transmission filter and fluid. Ask to drop pan and replace filter and fluid with original mercon sp. I'd avoid a "flush".

      I just had an 07 with 70k with same symptoms in my shop, fluid and filter fixed it.
       
    6. Flatwatr

      Flatwatr New Member

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      Thanks for the response. I know the transmission was serviced sometime back, but I’ll have to check when and why. That may have been an earlier fix and I just misunderstood.
       
    7. Flatwatr

      Flatwatr New Member

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      At 105K there was a "60K Economy Service" which included among other things, a service code 64506 Trans Treatment for 16.94 and XT 6 QSP Trans Fluid at 9.35 X 4, or 37.40 No mention of a Transmission Filter specifically. I can't find any other transmission service in the documentation I can put my hands on. I know I've sought correction for this "Sutter" on three occasions, I have record of a #8 plug and coil replacement at 82K, all 8 plugs with no coil replaced at 96K, and #4 plug and coil replaced at 107K.
      My "take away" from this research is to stay with one dealership, but I had a "business move" away and back, during that period.
       
    8. Flatwatr

      Flatwatr New Member

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      Well, the dealership put me off until May 29th for a rear driveshaft replacement. The Ford part is on National Backorder. I checked a number of Ford Parts sources before I ordered, received and replaced mine with a Dorman 936-896 in less than a week. That done, I still have the same pulsating vibration.
      I had low expectations this was the fix, but the center carrier bearing boot was gone which may have magnified the way my real issue presented itself. Still looking for a solution.
       
    9. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      Still no transmission service?
       
    10. Flatwatr

      Flatwatr New Member

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      Not yet. I won’t need it for a few days next week. I plan to accompany a tech on a test drive, make some well advised recommendations (thank you) and leave it with them to resolve.
       
    11. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      Then you have to pay for diagnosing and who knows what way the tech will go. He will probably assume it's a miss fire issue and advise all new coils as it's what's common.

      If you were closer I'd offer to do the transmission service and if it doesn't fix the issue I wouldn't even charge you a penny. I'm damn confident it's the transmission fluid/filter.
       
    12. Flatwatr

      Flatwatr New Member

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      With you confidence, I’d suggest the fluid/ filter change 1st; then run the analyst for plug issues with coils a priority if not corrected with step one.
       
    13. Flatwatr

      Flatwatr New Member

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      The puzzle is that you can see the pulse in the tac.
       
    14. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      Because the torque converter is having trouble staying locked at low RPM. Any jerking is related to plugs/coils.
       
    15. Flatwatr

      Flatwatr New Member

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      Three in four past fixes were with plug and or coil change. I want to connect it to vacuum levels associated with misfire.
       
    16. NC country

      NC country New Member

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      I have the same issue and have been told that it is the torque converter. My shop recommended changing the transmission fluid with and filter. I will report back once I have it serviced.
       
    17. Flatwatr

      Flatwatr New Member

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      Thanks fort the post. That seems a logical move.
       

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