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engine rev

Discussion in 'General Explorations!!' started by abarlow, April 20, 2002.

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    1. abarlow

      abarlow New Member

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      City, State:
      brunswick, Me
      Year and Model:
      98 Explorer
      98' 4.0 L
      With the engine at idle it sounds like the engine is reving with no change in rpm indications. It won't do it long enough to take a look under the hood. It never does it on intitial start up, only after driving for a while. It will stop after hitting the gas for a second or two. Any ideas?
       
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    3. Robb

      Robb Well-Known Member

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      Any rev of the engine should show up on the tach. I have heard that O2 sensors could cause the up/ down rev. I also had a Honda once that would do the same thing (usually in hot weather) and after engine heated up. I thought it was sensor somewhere, but found out the throttle cable just needed some lubing. It was fine when cold, but when it heated up, the cable would expand and rub on sleeve.
       
    4. Alec

      Alec Elite Moderator Moderator Emeritus

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      Year and Model:
      2008 JK
      Does it do it with both the A/C off and on? If it doesn't do it with the A/C off (system completely off) then it's the A/C compressor cycling. This is normal.
       
    5. abarlow

      abarlow New Member

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      After reading some other posts, it may be the idle air control valve. I'll check on the a/c on and off. Thanks for the info. How hard is it to change the iac valve?
       
    6. Alec

      Alec Elite Moderator Moderator Emeritus

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      Takes about 10 minutes to change. No biggie at all.
       

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