Ignition Stuck I started the van up but then could not turn key ignition to shut the van off. With the van running the key can be removed. I unplugged the battery so it would not drain battery. The Ignition is stuck in the ON position....please help...thank

sticking relay contacts in the PCM power relay , maybe . It's located in the central junction box . That is the inside the vehicle fuse box. That relay supply's power to the engine computer , ignition system , fuel etc.... If the contacts are stuck closed or sticking the engine would keep running with key off .

This is really quite dangerous you need to take this seriously here are some help
When I turn my car off, it continues to run and will not shut off. Why?
This can be caused by a few different things.The first item to check would be the alternator. There may be a feedback to the ignition switch from the voltage regulator field exciter wire. The other scenario that we commonly see is feedback from an aftermarket ignition system that utilizes an internal relay, or both a battery and ignition source to power the system. These are fairly common problems that people experience when using many aftermarket-wiring systems. Generally, an OEM harness will not have the problem of alternator "run-on", as there is usually a resistance wire in the dash harness to keep this from happening.
Solution: To figure out where the problem exists, start the car and with the key in the ON position and the car running, turn off the key. With the ignition turned off and the car continuing to run, simply remove the plug from the alternator (DO NOT TRY AND REMOVE THE BATTERY POWER WIRE FROM THE POWER STUD!) and the car should shut off if the alternator is creating the problem. If it does not stop running, your feedback problem is coming from something other that the alternator. If you are using an aftermarket ignition unit, check to see if there is a fix available that includes a diode to put in line on the ignition feed to keep their system from back feeding into the ignition switch. If you do not have an aftermarket ignition system in your car and it continues to run after pulling the alternator plug, you'll want to call tech support from your harness manufacturer for help. If your car does shut off when you remove your alternator plug, you may have to put a diode in line on the field exciter wire to keep the alternator from back feeding to the ignition switch. Again check with the harness manufacturer for help.

If you messed with the ignition system on the vehicle to get it started without a key then you disconnect what you did to now stop the engine.

Suggest disconecting the battery. Then you can work on the problem. it is not clear if the issue is the key stuck in the start position in the iginition switch or if the starter motor is stuck (running) after the car starts. If it the starter motor is running... Time for a new starter. If it is the ignition switch, try
pushing the key in and turning back off. Still stuck? Try pulling pn the key and turning off. Either way, if it is the key, yime for a new ignition switch.

This can happen if the battery is low / dead. To solve, connect a set of jumper cables between the battery in the Cobalt and a running car's battery. Shut off the running car. In the Cobalt, make sure all accessories (lights, radio, fan, etc.) are off. Step on the brake, then move the gear shifter fully into the PARK position. Next, either attempt to start the engine, or turn the key to the OFF position and remove it from the ignition.

I hope this helps & good luck!

It can be faulty ignition lock cylinder.I suggest to wiggle the steering wheel a bit and see if the key gets released out.If that is not helping then first turn steering wheel to right and try removing the key,or next turn steering wheel to left and see if you can remove the key.
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Spray wd-40 in the ignition key hole and let it remain there for few minutes,after that once again try to remove the key and see if that helps.
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But if that is not helping then ignition lock cylinder has to be removed out and key has to be manually removed.
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For more troubleshooting on these types of issues,i suggest you to refer the help links mentioned below.Its the accurate solutions mentioned in it.that will help you to narrow the problem:-----
Click the link below:------

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1999 Toyota Camry: Key Will Not Come Out Of Ignition?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-key-will-not-come-out.html
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2001 Toyota Tacoma: Ignition Locked?

http://technoanswers.blogspot.in/2012/04/2001-toyota-tacoma-ignition-locked.html
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Ignition Switch Will Not Turn Off?

http://schematicsdiagram.blogspot.in/2012/04/ignition-switch-will-not-turn-off.html
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Car will not turn the ignition to start?

http://technoanswers.blogspot.com/2012/01/car-will-not-turn-ignition-to-start.html

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Ignition Key OFF but engine still running?

http://howtobyme.blogspot.in/2012/03/ignition-key-off-but-engine-still.html
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Chevrolet Malibu: Key Stuck in ON position?

http://technoanswers.blogspot.in/2012/04/chevrolet-malibukey-stuck-in-on.html

2012 Dodge Ram: Ignition Key will not release?

http://whoisbyme.blogspot.in/2012/07/2012-dodge-ram-ignition-key-will-not.html-----------

Ignition locked up on Mercury Villager?

http://technoanswers.blogspot.in/2012/01/ignition-locked-up-on-mercury-villager.html-------------

Key won't turn in the ignition on Toyota land cruiser?

http://technoanswers.blogspot.in/2012/02/key-wont-turn-in-ignition-on-toyota.html

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How to remove ignition switch on VW Car models?
http://schematicsdiagram.blogspot.com/2011/12/how-to-remove-ignition-switch-on-vw-car.html
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How to Replace Ignition Switch on Chevrolet Caprice Classic?

http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-ignition-switch-on.html

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1995 Ford Taurus: Ignition switch not turning OFF?

http://repairhelpcenter.blogspot.in/2012/06/1995-ford-taurus-ignition-switch-not.html
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Ignition Problem Troubleshooting

http://whoisbyme.blogspot.in/2012/07/ignition-problem-troubleshooting.html
------------------These will help.Thanks.

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.

sometimes when one replaces the ignition a small plastic part falls from the new ignition causing it not to fully engage-for fun turn key with a liitle firmness all the way to sart-sometimes with added pressure it engages-orthewise remove ignition for examination

Remove steering column shroud(cover)and tap ignition barrel with small hammer while twisting key backwards and forwards,also turn steering wheel backwards and forwards sometimes this is enough to release key as the locking pins in barrel and the steering lock pin do sometimes jam.You will have to remove steering column shroud to replace ignition barrel if tapping/hitting it doesnt work anyway so its not a wasted effort.Good luck,let me know how it works out

Try replacing the ignition switch.