Does the motor crank when key is turned?If so check for a spark at the plugs.Get an auto electrician bypass your alarm
SOURCE: I need to disarm my
http://vatspasslockpasskeysecurityhelp.yolasite.com/ Go to that link. You are exactly right. The engine swap has confused the anti theft security system. It can disable the starter and/or the injectors/fuel. There are ways to bypass these systems. You can do it yourself too. Ive personally done dozens of these bypasses, and they work great. Good luck
SOURCE: This is teh second time my car just doesn't start.
Replace the ignition lock cylinder. The contacts for the security system in it are bad.
SOURCE: 97 Chevy Monte Carlo won't start, security light is on
disconnect battery for 24 hrs so the computer will reset and if that dont work take it to chevy dealer and have them reset it manually
SOURCE: My 1997 Chevy lumina won't start (anti theft)
use the valet switch that most systems have and that will over ride it
SOURCE: replaced ignition switch in 1999
You have to do a relearn procedure on the anti-theft system:
Attempt to start the vehicle. Leave the ignition on until the THEFT SYSTEM indicator turns off (about 10 minutes). Turn the ignition switch off. Leave the ignition switch off with key in for about 10 minutes. Attempt to start vehicle.
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