Why is the chevy tahoe 2002 not catching fire
No enough gas? Do you mean to ask, why does it not start? Spark, gas, air are necessary for ignition in the cylinder to move the pistons up and down continually. Remove any of these items and it will not "fire"/ start and run. Make sure the timing is correct, the computer module is working to send an electrical charge to the spark plugs at the correct time, and is there gas being pumped out of the ejectors when needed for combustion in relation to the spark? This is what needs to be checked for "fire" if that is what your asking. Start with gas. Is there gas coming into the rails to feed the injectors? Fuel line plugged by a bad or clogged filter? Fuel pump bringing gasoline to the injectors/EFI system? Is there spark at the plugs? Is the timing set correctly for proper firing at the cylinders? Some of this can be checked by the eye, other needs the proper tools hooked up to find the problems. When you turn on the car, do you hear the fuel pump working? Remove all dogs, kids, and turn off the radio before checking so you can hear. If the battery charge is weak, it may not allow the computer to function properly, which could be a bad alternator or battery, but this is one of the last things to check.