What all controls the fuel injector on a 94 4.3 w motor

Have you checked spark on no start? Crank sensors exhibit those symptoms.

All "crank, no start" conditions are approached in the same way. Every

engine requires certain functions to be able to run. Some of these functions

rely on specific components to work and some components are part of more

than one function so it is important to see the whole picture to be able to

conclude anything about what may have failed. Also, these functions can ONLY

be tested during the failure. Any other time and they will simply test good

because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only

serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have

to look for.

These are the basics that need to be tested and will give us the info

required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none

found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found,

check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if

the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete

compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.

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