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Unsolvable Explorer Rough Idle. Any OBD II experts?

Discussion in 'Under the Hood' started by Cashcrazy, October 26, 2016.

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    1. Cashcrazy

      Cashcrazy Active Member

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      I just tested the EGR valve with a vacuum pump and it passes the test. Would I have a rich condition and rough idle If the valve is functioning but something is keeping it just barely open at idle?
       
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    3. MostlyNewExplorer

      MostlyNewExplorer Member

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      Do you have any custom exhaust fittings on it that might create back pressure?
       
    4. Cashcrazy

      Cashcrazy Active Member

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      The explorer is 100% stock
       
    5. MostlyNewExplorer

      MostlyNewExplorer Member

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      I would drop the oil pan next time I change the oil, to eliminate that from the check list.
       
    6. Cashcrazy

      Cashcrazy Active Member

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      I really hate dropping oil pans.....
       
    7. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      The EGR valve should be completely closed at idle. If it isn't then the idle would be rough. However, I thought you posted earlier that you disconnected the EVR electrical connector and there was no change in the EGR flow as indicated by the DPFE voltage. It is possible that the valve could be mechanically stuck slightly open. Did you try blowing thru it when you had it removed? I suspect that EGR would result in a lean condition instead of rich since the O2 in the exhaust gas is depleted due to combustion.
       
    8. MostlyNewExplorer

      MostlyNewExplorer Member

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      It's not that bad. Drain the oil, which you'll be doing anyway, let it drain for about an hour so there's not as much drippage.

      Then pull the pan and check for pieces of nylon guides or anything else that shouldn't be there. Clean up the pan and the mating surfaces put on a new gasket and snug the bolts, torque according 2 the manual.
       
      Last edited: November 10, 2016
    9. Cashcrazy

      Cashcrazy Active Member

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      I did disconnect the egr solenoid and had no change. I also have no change when I just pull the vacuum line off the EGR at idle. I didn't try to blow through it when it was off. I may pull the EGR off this weekend for further inspection. Other than the MAF it's the only thing before the manifold that could cause a change in both banks. I'll check the vacuum with a gauge this evening.

      I start mentally preparing myself to pull the oil pan.
       
    10. MostlyNewExplorer

      MostlyNewExplorer Member

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      LMAO, I can't believe you're dreading the oil pan after all the other stuff you've already changed out.

      I just changed out the transmission on my 4x4 explorer, twice in 2 weeks. Oil pan is a walk in the park. I also changed the oil pan gasket, the rear pinion seal, and the Left rear parking brake cable while I was at it. Oh and the rear differential cover.
       
      Last edited: November 10, 2016
    11. plasticseng

      plasticseng Active Member

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      CashCrazy, Pulling the pan is not what you think if you are used to working on old school stuff like I was. There is an upper and lower pan, and you should be able to see what you need by pulling just the lower. The lower pan looks like an automatic transmission pan, so you don't have any end seals to deal with, no 4 pc. gaskets or any of that. It really is a 10 minute job to remove, 10 minutes to clean up, and 15 minutes to replace.
       
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    12. MostlyNewExplorer

      MostlyNewExplorer Member

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      ^ This
       
    13. Cashcrazy

      Cashcrazy Active Member

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      My experience of replacing an oil pan is laying on my back for an hour with oil dripping on my face then hoping the gasket is set properly in the rear main cap. Glad this one is easier.
       
    14. MostlyNewExplorer

      MostlyNewExplorer Member

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      This one is really easy, the gasket is flat and has rubber posts on it that snap into the alignment holes on the pan, so it's tight to the pan when you put the pan on. You can use pliers to help pull the rubber posts through the holes.
       
    15. Cashcrazy

      Cashcrazy Active Member

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      Easy enough on the oil pan. I can have a look this weekend possibly. Of all the work I have done the valve cover gaskets are the only thing that has made a difference. I checked tonight and no leaks.

      I went through and tested the EGR as shown on the link below and everything tested good. About the only thing left are injectors and converters. Has anyone tested and cleaned injectors at home? I may go pull a set from the junkyard to test.

      http://easyautodiagnostics.com/ford/4.6L-5.4L/how-to-test-the-egr-system-1
       
    16. Cashcrazy

      Cashcrazy Active Member

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      I'm going look for a nipple to screw into the bank 2 o2 sensor to check the back pressure with my vacuum gauge. Maybe this will explain the odd downstream reading. I also hope I can get the o2 sensor off without beating it up.
       
    17. Tylers02

      Tylers02 Active Member

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      The one I pulled at the junkyard gave me no problems except the damn connector at that was with channel locks. I think the thread jinxed me I have developed a pretty rough idle now so I'm going to be swapping back in my old egr. The tick has increased so I have valve cover gaskets on hand to do some exploration. That's of course if I don't loose a wheel first I have almost no steering control and 3 shops that can't find anything wrong. My next stop is off a cliff if I don't get this figured out soon.
       
    18. Cashcrazy

      Cashcrazy Active Member

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      I have had good luck with Marvel Mystery oil removing ticks in the past. Lifters can get sludge and start ticking
       
    19. Cashcrazy

      Cashcrazy Active Member

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      I tried testing the cat tonight and don't have much to report. I removed the bank 2 upstream sensor and installed an adapter I made to tap in with my pressure gauge.
      [​IMG]
      I didnt have a reading at idle and at 2500 RPM I showed maybe 1psi. I also started the explorer with the o2 bung open thinking it would relieve so pressure if it was the problem. Still had the same idle. That's all folks.
       
    20. Cashcrazy

      Cashcrazy Active Member

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      I'm researching a part and hoping someone knows a good supplier. Where can I get a ECM that is programmed with keys and ready to plug in and go.
       
    21. Josh P

      Josh P Shaggin Wagon Elite Explorer

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      Marvel Mystery oil is good stuff. Do you have the same rough idle on E85?
       
    22. Cashcrazy

      Cashcrazy Active Member

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      There is no e85 available within 120 miles of me so I've never used it
       
    23. Cashcrazy

      Cashcrazy Active Member

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      I had to take a break but it's still chugging along. I reset the ECM again after replacing the one downstream O2 sensor and the fuel trims on that bank improved but I don't feel a difference in the idle. I ordered a new downstream sensor for the other side just to see if there is an improvement on that side also.

      The injectors are still on my mind since I haven't really tested them. it's a decent amount of work to pull the intake and I hate to pull it and not replace the injectors, but I also hate to throw hundreds more in it. What's everyone's opinion on pulling a set of injectors from the junkyard to use? I will have no idea of the mileage on them, but I could clean them up as much as possible in the garage. Would I be able to reuse the new intake gaskets if the intake is pulled?
       
    24. MostlyNewExplorer

      MostlyNewExplorer Member

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      I would never reuse an intake gasket.
       
    25. Cashcrazy

      Cashcrazy Active Member

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      I normally wouldn't either but these are more like orings and not made from cork. The ones I have dealt with in the past have either been metal or cork.
       
    26. MostlyNewExplorer

      MostlyNewExplorer Member

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      I thought the intake manifold gasket was good when I rebuilt my 350, but it leaked a little once it warmed up.

      Since it's already apart, and all you have to do is put the new gasket on, you'll be money ahead by doing it.

      I would have pulled that oil pan about 20 posts ago though.
       

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