Moter swap from 2002 to a 2004 car won't start I took the ECU the airbags the gauges and I put them from the 2002 to the 2004 that's it the ignition cylinder so the key are the 2002 and put the ignition into the 2004 they mobilizer ring everything is in the 2004 that was in the 2002 except for the wiring harness now the viper security system has been pulled loose I'm turning the key on the green light goes off I turn the car over and it does not start and I turn the key off it flashes the Green key flashes five times is there anything I can do to make the car start or did I do all this work for nothing

 

Get it rekeyed. Call a locksmith, if he can't do it he can tell you who can.

 

Yeah man so I think the security system includes the ignition switch. It’s got like a receiver transponder thing the key itself and then the ECU. Once all those things are linked up then you fire it up. There is security light on or anything like that.

 

When i turn the key on the green key goes out after 2 seconds try to start the car it just turns over no start when I turn the key off the green key flashes 5 times is this normal or is the key flashing not letting it start

 

Tear down the doner steering column and see if there's a " transponder " somewhere , Hold it next to the ignition switch and see what happens . Key sends signal to transponder , transponder connects with ECU , Your experience may differ

 

You need to marry the key, immobilizer and ECU together. You need an HTS or high end scanner to do this.

 

Check all grounds, also check that the shifter lever is not misaligned. (Meaning the led might be pointing to park or neutral but the transmission might actually be in gear, and with the tranny in gear engine doesn't start.) I'm talking from experience.

 

........ I got it fixed this whole time I did all this stuff to it and it ended up having bent valves I took the head off put on a different one and un plugged the sensor that is out and it started the car was running win I parked it so I don't know if it's the sensor win I plug it in the car dies and won't start unplug it and it starts so only three valves were bent would the car have started with 3 bent valves 1 in each piston just one piston with no bent valves