remote start cranks but no start

JWorm is closest to the correct answer..... it's highly likely that you may have reversed ignition and ACCESSORY /HEATER wires. try this....can you hot wire your car to turn on using just the ignition and starter wires that you've chosen? if not, then you've got the wrong wires. all you should need to use are BLACK / YELLOW and BLACK/ white from the ignition harnesses. good luck