Car Alarms: alarm will not let the van start, transponder chip, clifford alarm

Question
i purchased a windstar van from an auction. the first time it did start and turned off suddenly. well we pulled it home. when i try to turn it on it'll show me a lock key icon. it will only seem like it will start but won't. i wanted to know do i just tear that clifford alarm from the van or what should i do?

Answer
What year is the van?  This sounds more like a problem with the Ford PATS transponder system than it does with the Clifford system.  Here is a generic how to on alarm removal:

Typically an alarm system would be installed on the driver's side interior of the vehicle.  This system would have been tapped into the ignition switch wiring running down from the key.  If you remove the dash panel(s) under the steering column you should be able to locate where the harness was added that goes to the alarm.  Disconnect each wire that was tapped in and insulate the factory wiring.  You will also see that at least one of the wires was cut, this is the vehicle starter wire that runs from the key to the starter.  This wire needs to be restored, I always recommend soldering all connections but crimp connectors should also work.  Make sure that you remove all connections to the alarm and that any wires that may be exposed are insulated and mounted in a way that they will not interfere with any moving parts and do not run the risk of shorting out.  Remember to take your time and follow each connection running from the brain of the system, leaving one wire connected that you are unsure of the function could cause problems in the future so be sure to remove every wire.

I think your problem is not with the aftermarket alarm however.  I think it is with the PATS system not being able to read the transponder chip in the key and would need to go to a dealer for repairs.