2004 V -6 GMC Sierra Engine won't start not

1-8-4-3-6-5-7-2

Driver side cylinders, starting at the front of the engine, are 1,3,5,7

Passenger side, starting at the front, are ,2,4,6,8

Hope this helps.

1 fuel pump working
2 is there fire to spark plugs
3 air filter good not obtructed
4 any engine code set
you might find your problem with that basic

check for spark.. if no spark replace autoshutoff relay it controlls fuel and fire..

Spray starting fluid into the air intake of the engine, if it starts and you have fuel pressure you have no injection or injector pulse as we call it. Check ECM fuse one and two for continuity if it starts with fluid..

The first thing I would check is fuel pressure. This type of fuel injection requires a minimum fuel pressure in order to operate. If fuel pressure is as little as one psi below minimum the vehicle will not start. You can try squirting a couple of shots of carb spray into the air snorkel while somebody cranks the engine over. If the engine starts and then dies you now you fpdeffinetely have a fuel issue. If the engine still won't start check for spark. Let me know what you find. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

i have a 1993 suburban gmc 1500. when i put the key in an turn it nothing happen at all.befor the car stop running it use to act crazy like start up in run great but when u turn it off it dont start back up. u wll have to wait than it will start..can u tell me what that can be..

start by checking the firing order and the timing. the timing chain may have jumped a tooth

change the fuel filter then get back to me.

chek injectors posible leak

Needs a valve adjustment. I assume its EFI, eliminating the possibility of the carb.