Question about 2001 Ford Expedition

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2001 ford Expedition odometer reads 100mph

My odemeter reads 100mph when stopped or engine is shut off. when traveling it will go to 85mph. i don't know what to do, please help???

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  • Anonymous Jan 25, 2009

    My speedometer says 120 when its stopped, and only goes down to 90 when going full speed !

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There is three possibilities that are most likely, one is the speed sensor located on the transmission, a bad ground, and the other is a bad motor inside the gauge itself, testing the speed sensor is hard without the right equipment but for 30 dollars for a new VSS and one bolt you can change it out to see if that corrects the issue, you should also check all ground wires to be sure they are properly secured and that there is no corrosion on the contacts, the speedometer motor is another part that is near imposible to test without equipment, you need to apply a certain voltage to the unit and check to see if it goes to the right speed reading, unfortunatly I do not have the voltage/reading chart for your vehicle but you may be able to obtain that from a helpful dealership

Posted on Oct 11, 2008

I used to calibrate police speedometers, The odometer by the way is the device that records how much distace you have travelled, The little numbers on the bottom of your speedo. If your speedo reads 100mph regardless of how fast you are travelling, The answer is simple you have some dirt jammed in your speedo. Check that your speedo is mechanical ie it has an armoured square ended cable that comes from the engine to the back of your speedo. Get your hand round the back of the dash and find the back of the speedo. See if you can feel an armoured cable going into the speedo, if so it will usually unscrew and let you pull the square drive inner out. This task is easier if you can first get the speedo out. It will have to come out. Then take the speedo apart without removing the pointer. A cup spins round a magnet and the pivots on the magnet sometimes get glued up. Clean with fine paint brush and parrafin. DO NOT TOUCH THE HAIRSPRING. Get diagram of dragcup speedo as it will show you all the parts. Hope this helps

Posted on Oct 11, 2008

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