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rpm flare

  1. I

    Rpm fluctuation/drop then surge.

    so recently after hitting 200,000 on my 07 EX 4.0. my transmission between 3-4th gear rpms will stay the same,@2000 then drop,1800 then spike up to 3000 then shift into 4th gear, it doesn't do it all the time, and i can drive slow or be "nice to the transmission" it will still lag but not...
  2. G

    Ditch the Exploder?

    So i have my '03 XLT 4.0 with 223k miles on it. I've beat the crap out of the thing, especially lately. Some things that are wrong with it; IACV (idle air control valve) is broken, the truck flux's on occasion when idling. Differential carrier bearing, I hear a very very distinct hum when...
  3. J

    RPMs Jump @ Cold Start in 4.6L

    A few days ago, the RPMs on my 2003 Explorer with the 4.6 started jumping up and down at a cold engine start. The RPMs will continue to jump for 5+ minutes. If you put the vehicle in drive or reverse during this, it will lunge forward (or backward) as the RPMs jump. The RPMs will stop jumping...
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