Hi ,I have a chevy blazer s-10 1993 and she won't start ,I change :spark plugs ,cap ,rotor , spark plug wires, fuel pump (58 psi) injectors (spider)internal hoses, starter and battery. but still my truck does not start, it cranks and electric works but just wont start. when i use to spray starting fluid she starts rite away but now it does not want to start. can anyone help me?

If you replaced the injector after the plugsthey may be fuel fouled.Pull the plugs and clean them.(you can sandblast them,or use a method I used to use-shoot a little starting fluid on them and use a lighter to burn off the contamination of too much fuel).I can't believe GM kept using this stupid design so long-I remember nearly new Vortec V6s with this same problem in the '90s.

Check the plug wire from the ignition coil to the distributor cap.
If you haven't already, replace the distributor cap and rotor.
The GM Vortec's have issues with moisture getting inside the cap and rotor and causing problems.

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Crank sensor is primarily for the spark and the cam sensor is for fuel management, crank/cam correlation for misfire purposes I would also change the wires.

Anytime a car wont start its missing one of the key things it needs to start. Air, Fuel, spark or compression. The first thing to check is to pull a wire off the spark plug and put a screw drive in the end of the wire. Lay the screw driver on the engine near metal. Crank it and look for a large blue spark it should make a nice popping noise.
If no spark try the same thing with the coil wire. If spark its the cap or rotor. No spark its the coil or module.
If the plugs have spark, try pouring a small amount of gas in the throttle body and see if that starts it. If it does, fuel problem check filter and pump.
If it wont start with either or gas in the throttle body and the plugs have spark then it is either a timing or compression issue. Remove the plug wire from the center of the distrib cap and then remove the cap making sure no wires come off. Have someone crank the engine and see if the rotor spins. If it does not you need to replace the timing chain/belt. If it does spin rent a compression checker and check each cylinder.

Hope this helps.

Try replacing the fuel filter, but it sounds like you have a weak fuel pump. Your cold start pressure should be 62-65 psi and drop about 5 psi when the engine is running. Anything less then 62 psi is going to cause you to have starting issues, you can also test your fuel pump by blocking off the return line to see if you get 75-78 PSI. this is just a test to see if your fuel pump is still good. If you have less then that with the return line blocked off, replace your fuel pump but check your ground wire first. The ground wire is separate from the wire harness and grounded to the frame and a bad ground will give you a weak pump.
Thank you for using Fixya and good luck

Looks like you've covered the basics, make sure the firing order is correct with your spark plug wire replacement. Hope this diagram helps.

Check the fuel pressure regulator and the EGR valve, I would check the fuel pressure regulator first and go from there. Good luck and keep me posted. Not sure what the pressure should be but thinking it's 62 to 65 PSI upon start up and should drop 5 PSI when engine running, check the vacuum line to the regulator.

Recheck the spark plug gap - these so called pre-gapped plugs are not always correct, also check the primary and secondary resistance on your coil.

The proper fuel for this s-10 is 58 psi to start the vehicle and it will run on 45 psi but not to good .:)

Hi have you checked fuel pressure or a fuel leak you should not be able to smell gas