only with key remote start

There are many possible problems that you might have done

Need some more clues:

Does the Ignition come on with the key? Is it just the starter that doesn't crank?

Is the remote start Output wired up before or after the starter cut relay?

My first guess would be that you have a problem with the starter cut relay wiring and that the remote start is wired after the cut relay; so the remote start is bypassing the starter cut & enabling the car to start.

Check out your starter cut wiring.

I just noticed that you have another thread going - why did you start a new thread??? 

This is obviously related - you say in the other thread that you have not wired up the the starter cut relay????  Did you cut the wire in the harness? You need the relay in place to complete the circuit again - it shouldn't matter if the drive is wired up however as the starter connections should be across the normally closed poles - it only "opens" to disable it it alarm situation.

   It sounds like the 556u  it wont start becouse of the chip that the key has

Jeff, make sure that the PLXR has these wires hooked up to the car:

• BROWN -- ground when running wire off the RS unit. For testing, just ground this permanently while remote starting and then lift ground when inserting key and pressing brake.
• GREEN -- This goes to a light green wire in the ignition harness that will test (-) when the key is inserted into the key cylinder. There will only be 2 light green wires. Test both of them.
• BLUE -- This wires goes to the YELLOW Passlock II wire
• VIOLET/WHITE --  NOT USED
• VIOLET -- Goes to the motor side of the starter wire. In your case you did not use a starter disable relay so it goes to the starter wire off the car ( YELLOW )
• PINK/WHITE -- NA
• PINK - - NA
• ORANGE -- NA
• RED -- This HAS TO BE hooked up to the PINK wire on the Buick at the ignition harness
• BLACK -- This goes to chassis ground

Set the PLXR to two blinks at the beginning of the programming. Press the program button for 5 seconds until the light turns solid. Start the Buick and press the button one more time to learn the resistor code and the light will flash momentarily. Turn off car and your done.