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1997 Expedition. 5.4l V8. Starter engages when vehicle running. Starter engages when key is in off position. Power to vehicle stays on ven when key is in off position. Have removed and checkes ignition switch but it is functioning properly...
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I would take a look at the wires down at the starter. He may have the large positive wire shorting to the smaller, trigger, wire. This could potentially cause a back-feed through the whole system.
check to engagement wire at the starter, make sure that power is only present when key is in the start position.if this is the case, then your sarter bendix is hanging up on the flywheel, this is caused by either inproper shiming where the starter is bolted to the block, or having the wrong bendix on the starter, there or several different bendix s general motors uses, also if the return spring in the solonoid is broken or not strong enough the starter could hang up. if the problem is power continuing to feed the solonoid with the key in the run position you could have a bad or out of adjustment ignition switch, since the power feeds the solonoid directly from the ignition switch, other than the neutral switch on the colomn
You most likely have a short in the wiring to the starter.
Last time I saw something like that a vehicle's exhaust headers created heat which eventually melted the wire's insulation and several of the wires were exposed and shorting on each other and the ground of the vehicle. If possible, get the car on a lift and inspect your starters wiring....
In order to program your own chipped keys you need 2 keys that will start the vehicle. Start by putting the first key that starts the vehicle into the ignition and turn it to the run position(not the start position) and back to the off position. Within 10 seconds repeat this step with the second key that starts it. Then within 10 seconds put in the new key and turn it to the start position. The vehicle should turn on and the new key will be programmed. If you do not have 2 keys that start the vehicle then you will have to take it to a Ford dealership so that they can program new keys for you.
ANTI-THEFT SYSTEM Passive anti-theft system Your ignition key has a unique imbedded transponder which engages engine electronics and allows the vehicle to be started.Without the use ofyour specialignition key, the vehicle will notstart.
During each vehicle start, the coded key is read by the anti-theft system. If the key’s ID code matches the code in the anti-theft system, the vehicle is enabled to start.
Anti-theft system Briefly illuminates when the ignition is turned to the ON position to verify that the passive anti-theft system is operating
properly.
Also, its possisble that tou have actovated the fuel pump switch.
Under the hood on the passenger fire wall you will see the starter solenoid.Unplug the small wire running to it and see if your problem goes away.If it does problem is ignition switch if it does not then tap the solenoid and see if it quits.If this takes care of it then solenoid is bad.
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