Ignition will not turn off the car, key out car still running, switch just turns does not seem to be connected will not turn off the engine.
It sounds like the small arm inside the steering colunm has broken. on my windstar it was actually two pieces. if you do not have tilt steering the job to replace it isn't too bad tho you have to pull the steering wheel and remove the lock cylinder. to test if this is correct you would need to pull the ignition switch... it's under the steering column. there is a pin on it that fits into the arms that come down from the ignition switch. remove the ignition switch and turn the key while looking up into the hole where the small arm is. if it doesn't move it is broken.
for the immediate problem just either pull the fuse for ignition or remove the breather snorkel that attaches to the throttle body and block it off with your hand.
If the switch seems to be disconnected, how is the vehicle started?
If the key starts it, it should be the means of stopping it. However, you could have a bad contact on the key switch that does not remove the 12 Volts from the ignition coil.
Recall that your ignition key first applies 12 volt to the ignition system, then powers the starter selenoid to crank the engine. Once started, the start position is released and only the 12 volt-coil position is maintained.
You need to apply a volt meter (for 12 volt test light) to the BATT terminal of the HV coil and see if the key connects and removes 12volts correctly. If not, replace the key switch. IF it does remove the 12 volts correctly - then it is possible that you are running too advanced or too lean on fuel mixture - resulting in dieseling (which is the ignition of fuel in a gas engine by the excessively hot spark plug element).
SOURCE: WHEN I TURN THE IGNITION SWITCH OFF MY ENGINE KEEPS RUNNING
The ignition lock cylinder has to be what I guess you would call timed, if they get this it wrong then the key will do things like what is happening to you, it is an adjustment that will require they remove and reset the position of the lock cylinder.
BOTTOM LINE, TAKE IT BACK.
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