pontiac grand prix se

https://www.2carpros.com/articles/car-cranks-but-wont-start

Verify the valve and ignition timing if its correct-if okay look for fuel and spark

well we changed the timing chain then later when we pulled the motor out we realized that it was hooked up to the number 4 plug and not the number 1. could that be the problem that its out of time?

well we changed the timing chain, and then after pulling the motor out realized that the number 1 plug was on the back of the motor and we had hooked everything up to the number 4 plug, could the car be really out of time?

Could be due to the wrong firing order-try switching it-don't work do below:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems
with compression and valves opening and closing at the wrong time/broken or jumped timing
belt/chain.