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explorer won't rev

Discussion in 'UK Explorer Owners Forum' started by darby, October 8, 2005.

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    1. darby

      darby New Member

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      City, State:
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      hi ther i have a ford explorer 1998 4.0 v6
      had the car from auction then find out it's ruf at idle and won't rev past 3000rpm
      code read it all clear
      cheaked for blocked intake and exhaust all good
      dont know what's happening
      got a teck cd off ebay just waiting now
      eney idears
      please help thanks darby
       
      Last edited: October 8, 2005
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    3. dman726749

      dman726749 Well-Known Member

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      it wont rev past 3k in gear or in park? if in park thats normal. there is a rev limiter so it is not over reved in park, now if this is while its in gear its a totally diffrent story.
       
    4. darby

      darby New Member

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      no rev

      when she's in park nutral or drive
       
    5. Howard

      Howard Moderator Elite Explorer Staff Member Moderator Elite Explorer

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      1998 SOHC UK SPEC
      Check the obvious first. Does the throttle open fully? Are the floor mats in the way? You can take out some slack from the throttle cable with cable ties by the pedal. Check the TPS for correct operation. Check the fuel filter.
       
    6. spindlecone

      spindlecone B

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      Disco the batt, reset the PCM, how many miles? (plugged cat?)
       
    7. darby

      darby New Member

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      i am a mercanic and have tryed most things
      it stuggle's at idle as down too overfueling whaen reved it picks up nicely till 2500rpm and flat out at 3000rpm more thottle just make's more induction noise
      i have a snapon code reader and can't find fault's /disconnected battery to reset pcm / disconnected exhausts front of cat's / good compession / mas and cam + crank sensors all good :(
       
    8. dman726749

      dman726749 Well-Known Member

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      try cleaning the iac and maf....there are threads on here that show how to do each, not hard at all
       
    9. darby

      darby New Member

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      should still rev if maf or iac were playing up
      but i have cleaned iac and changed the maf
       
    10. Howard

      Howard Moderator Elite Explorer Staff Member Moderator Elite Explorer

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      Could be the FPR is stuck closed (Fuel Pressure Relief Valve). This would cause excessive pressure and maybe flooding the engine.
       
    11. Bigusdickus

      Bigusdickus New Member

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      Intake O Rings

      Rough idle is a sympton of the intake o rings letting air in after the throtle butterfly, could be a limited opperating stratergy due to exhaust oxegen/ mixture wrong see posts on the O ring call back problem.( needs O rings made from different material) How do the timming chains sound on cold start up) just done mine it runs like clockwork now

      Dick
       
    12. Zulu95

      Zulu95 Active Member

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      Show Me!
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      Check that the accelerator pedal is not hanging off the firewall. My pedal dropped off while driving a few years ago. Had to have my mechanic redo the Ford dealer repair because the bracket was bending again and I could not get full engine response.
      Cheers!
       
    13. darby

      darby New Member

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      no my pedal is fine geting full trottle today had the inlet manifold off and cheaked all gaskets all fine not sure if it is the pcm or the gearbox controler
      do they rev limit in park and nutrual ???
      got a cd on the way hope its got the info i want
      thanks darby
       
    14. spindlecone

      spindlecone B

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      As said above yes they rev limit in park and neutral, if you have an auto tranny
       
    15. darby

      darby New Member

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      it is an auto tranny my code reader can see all gear selections but i don't know what contols it rev limiting ?
      but she's still crap at idle which take's me off the idear
      when cold will not idle and has not alot of inlet mainifold vacum whitch get's better as it warm's up but even then you can't lock the brake's
      strange i know but she looks a nice motor and i want to go have a good drive to see what i think of it
      it is doing about 40 mph at the mo all gears seam to work
      i don't know ? :(:(:(
       
    16. Howard

      Howard Moderator Elite Explorer Staff Member Moderator Elite Explorer

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      Sounds like the inlet manifold 'O' rings are leaking or you have some other vacuum leak. I found on mine that the upper inlet manifold came loose which caused all sorts of idle issues.
       
    17. 410Fortune

      410Fortune ELITE BRONCO2ERER Moderator Emeritus

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      Sounds to me like the PCM took a dump.
      I have not seen a OBD-II (EEC-V) computer take a dump yet, but I have seen a really similar situation to what you describe happen a few times on EEC-IV computers.
      We had a 93 Explorer, would fall flat on its facce over 2800 RPM, no matter what. Codes came back all clear.
      Tried everyything. Swapped computers, ran perfect.
      Junk yard computer was $60, still runs perfect to this day.


      Also which 4.0L V6 is this? OHV or SOHC? (sohc = timing?)
       
    18. '92Bauer

      '92Bauer Active Member

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      I was having a similar problem except at 2500rpm. My mechanic told me it was the crankshaft postion sensor and I am going to pick up my X and let you know.
       
    19. darby

      darby New Member

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      looked at the inlet o rings looked fine getting some new one's fit to make sure
      have thought that the ecu may have gone down about £170 big risk but may have to do it to be sure
      ive had the crankshaft sensor of it has resitsance and when something steel pasted over sensor it trigers but i dont know sepc reading's
      got a cd comeing for that i hope
      it is the sohv timeing chain's do they slip no noises off it
      just a bit of tappet noise
      thanks darby
       
    20. 410Fortune

      410Fortune ELITE BRONCO2ERER Moderator Emeritus

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      SOHV = ? Overhead valve (pushrod engine)
      or SOHC, single overhead cam
       
    21. greenbeer

      greenbeer Another day, Another dent Elite Explorer

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      I don't think they sell the OHV in Europe. The SOHC is a European motor.
       
    22. darby

      darby New Member

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      sohc sorry 8th digit of vin is E
      is this not a (EEC-1V) system ?
      phoneing round tomorow to get ecu tested make sure it's ok
       
    23. 410Fortune

      410Fortune ELITE BRONCO2ERER Moderator Emeritus

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      no its a EEC-V or OBD-II a system in 98
       
    24. darby

      darby New Member

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      can't find someone that can test pcm (ecu)
      next thing's one from the scrapy and take a chance
      or strip down and check timing look's like geting in there to work on it :)
      thanks darby
       
    25. darby

      darby New Member

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      talking to a man today who said that he had a x with the same symtoms
      turned out to be valve timing
      chain guide's worn and broken
      engine out :(
      it say's that you can check timing with engine in do that first i think
       
    26. darby

      darby New Member

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      primary timingchain tensioner exploded dropred into balance shaft chain exploded that tensioner but i think ive got all bit's and now waiting for part's
       

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