Have 2000 2.4 sunfire no start

Could be a problem with the key lock, or something inside the transmission. You could disconnect the cable from the trans and try to manually shift it into park to find out. Make sure the wheels are blocked if you do.

check if you have brake lights, if not your brake light fuse or brake switch are bad replace fuse or switch and it should work again if this was helpful please leave good feed back

Defective shift cable.

hope this will help a friend of mine told me he changed the ignition and because of the antitheft device it wont start u he said u need to reset compuyer to accept new ignition im not quite sure but the way to do that he said was to turn key on just befaure it turns over leave the key on for i think half hour then turn key off then back on repeat that 3 or 4 times yes it will drain ur batt but it will reset computer for new ignition hope this helps u

It sounds like a timing issue. Make sure the cam shafts and timing belt are installed correctly. Hopefully you have not belt any valves while trying to start it. Good luck.

check spark plug wires and coils for moistore put some lube on the coil wires check for spark after it wont start if itll crank but not start its 1 of 2 thinks no spark or no fuel usally when the coils get too wet they wont allow spark to come through or will cause it to arc

I suggest rechecking all your work, because if it started prior to the repair you may have missed something.

starter relay,ignition switch,park switch.need to use a volt meter and start at the starter,see if you have at least 12 volts.if there is have the battery tested.does your head lights come on?next no voltage, go to the fuse box under the hood and check for (2) 12 volt powers with the key on and a good ground.if ok replace the relay.next move the trans shifter to neutral with foot on brake and try and start if it starts you need park switch.if not next is the ign.switch to test,you will need to locate the starter wire and check for voltage when starting if none replace the ign.switch hope this helped.also the alternator has nothing to do with the cranking of the engine on this car.

security system . Trun the ignition key on and leave it on for about twenty minutes,(light should stop falshing) then try and start it.

i had this problem if u turn the key 1 clickthen put the car into nuetral then start it you can move the gears into drive reverse and park but you have to do it every time im sure it can be fixed some how but i sold the car as is but it worked for me for 3 months and was still working when i sold it i think its a safety switch or something good luck let me know