Question about Chevrolet 1500
45 psi is enough to start the truck. I assume you measured that at the schrader valve on the fuel rail. Have you tried squirting gas or starting fluid straight into the air horn? Fig. Fig. 2: Crankshaft Position (CKP) sensor wiring diagram
If it will fire when doing this, your injectors are not releasing the gas in the fuel rail.
Check injector solenoid operation by holding a long screwdriver to an injector, put the other end to your ear while someone cranks the engine. There should be a regular click. If there is clicking, the injectors are probably clogged. If no clicking, there is a problem with the cam position sensor or the ECM.
If it will not fire with starting fluid, the problem is not fuel supply. First check the 20 amp ECM-1 fuse. If OK, check for spark by pulling the coil wire off the distrubutor and holding it close to engine ground while someone cranks the engine. Sparks should jump to the engine. If not, check for power to the coil--take connector off coil, connect a 12 volt test light to engine ground and probe the coil connector terminal with the pink wire while someone cranks the engine. If there is power to the coil but no spark, the problem is with the crankshaft position sensor, coil driver, or the ECM.
If there is no power to the coil, the problem is likely the ignition switch.
If it willl not fire with starting fluid and there is spark from the coil wire, the problem may be timing. If you get to this point, I recommend testing or replacing the crankshaft position sensor. The sensor is on the front right corner of the engine block. The part is $60, so you may want to test it first. Here are test procedures from autozone.com:
Please let me know if you have any questions. I will past the wiring diagram below.
Fig. Fig. 2: Crankshaft Position (CKP) sensor wiring diagram
Posted on Nov 14, 2010
AC Delco plugs are critical in these engines. Others will work fine but will trigger a check engine light (P0300 random misfire). Test the fuel pressure and get back to me. There should be a schrader valve to make this very easy. Just because you hear the pump, does not mean it has any pressure. Let me now.
Posted on Nov 13, 2010
Have u changed the fuel filter.if not this is agood cheap place to start and it wil lnot hert if it dose not fix it but i am thinking u have a little water in the filter. hope this helps
Posted on Nov 13, 2010
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Posted on Jan 02, 2017
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