Will it stay running if you hold your foot on the gas pedal? If so, you need to relearn minimum throttle after the battery was replaced or disconnected. Drive at highway speed, then coast for at least seven seconds without touching the brake or gas pedals. After that, the engine computer will know when it has to be in charge of idle speed.
If it will not stay running for more than two seconds with your foot on the gas pedal, it is in anti-theft mode. If the car is equipped with the factory anti theft system but it won't turn off, suspect a broken or disconnected switch in the driver's door, or a broken wire between the door hinges. Try unlocking the passenger front door with the key. That should also turn off the anti theft system and allow the engine to start.
If the car isn't equipped with the factory anti theft system, a voltage spike most likely caused the engine or body computer to self-program itself to thinking the anti theft is on the car. Either computer will then teach that programming to the other computer. You must replace BOTH computers at the same time. If you use used computers, they must be from a car without the anti theft system. You absolutely can not just install one computer at a time in an attempt to get it started because it will learn the anti theft programming from the other computer. Once a computer self-programs itself, it can not be undone. That's why they must both be installed at the same time.
Tuesday, October 20th, 2009 AT 3:02 AM