Question about 2002 Ford Explorer

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Jerking There seems to be a problem when vehicle is in 4th or 5th gear and a 1500 to 1800 rpms. The vehicle begins to **** like it is not getting enough gas, but I just changed my fuel filter.

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  • golfmoor11 Sep 10, 2008

    Not yet. That was my next step. Thanks for your help.

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If it was a misfire it would do it in every gear not just 4th and 5th ....what you have is a speed sensor control problem. what this does is when the car goes into overdrive "on your car its 4th and 5th gear" it tells the ecu how much fuel to send to the intake...when this sensor gets tripped up it either overload the engine and put a check engine light on or it will go lean " which your car is doing" to fix this problem there is a sensor on the side of the transmission drivers side...disconect it and manualy go through the gears until it gets to overdrive...if it runs fine by that...then plug the sensor back in and head to the dealer and order a new speed control sensor....aka the one that shuts the car down at 100mph:) thats why i dont use em:)

Posted on Sep 11, 2008

  • KyleM_73 Feb 27, 2011

    May also be 4x4 trying to engage. Try pulling the 2 fuses in the engine compartment fuse block and see if it helps. Fuses 17 and 18 ( check owners manual to be sure). Mine does this and I haven't yet figured out the cause. Possible speed sensor problem.

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Have you changed the plugs and wires .sounds like you have a miss

Posted on Sep 10, 2008

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1 Answer

The rpms seem higher on this vehicle than I am use to seeing, cruising at 80mph the car is hitting 4000rmps. Is this normal for this vehicle?


there is not enough specif details available to be able to be close to exact But I will give an example that you can compare
in a manual transmission with a diff ratio of 3.909 and in 5th gear the rpms for 79 mph is 3200 rpms
the difference between gears is around 250 rpms so if you try to correlate the differences if it was in 4th gear the rpms would be around 3750 rpms so I suspect that the over drive section of the transmission is not engaging ( assuming that it is auto transmission)
so to answer your question , I am saying that it is too high in rpms for that speed and I suspect that the od is not being engaged as the rpms at 80mph I would be looking at around 3200-3500 rpms depending on the diff ratio

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The only thing that comes to mind is that in 5th, the rpms may be so low that you are running on low speed potion of ignition module, getting weak spark and not burning fuel properly. This could be true in all gears at low rpms, but you would not notice it as much because you probably keep the revs up more in lower gears. Just a thought.

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