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Check for a shorted or grounded fuel injector the test light will flash but there's not enough current to move the injector. Use a DVOM check that they're all the same.
Replaced a crank sensor on a similar model. Easy to do.
See if tach moves when cranking.
If it is starting and not just cranking, then shutting off, sounds like it might be an ignition switch. On some models, the contacts for start are different than for run, Start ones are good and it starts, when key turns to run, it turns off. That would be my next move to test.
I have to ask, how long since a tune-up? Are there any applicable trouble codes?
Where applicable, if it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse.
Make sure battery has a full charge.
Check for rpm signal, see if the tach moves when you crank it over, if not you have a bad crank sensor, it is located by the crank pulley, otherwise may have a control module issue.
crank sensor is tied in with the tach,try start and look at your tach gauge for movement if it move up and down crank sensor it's ok if not you have problem with crank sensor or electrical problem.
yea the 93 to 95 trucks never had a tach that works very long
and first the Tach does not make the od light blink or ck engine lgt
the crank trigger does this little thing is located right in middle front of engine between the vac pump and pwr steering pmp looks like a brass bolt with wires comming out of the back of it costs about 30 bucks (don't forget the locktite blue)
now that should fix the od lights and the ck engine but it may not fix the tach thats done in the tach driver module on back of tach in dash
you can replace this but my vote it's too expensive I did mine just fine with a after market one(50 bucks), bolted it right in front of old one, it hooks up super easy gets it's signal off the alternator stator
im sort of suprized it starts ok with a bad crank trig (eec needs to see +50 rpm to start fuel flow to injectors )
any good shop with a eec scanner can see this in just seconds
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