Crank but no start?

1997 CHEVROLET 1500
140,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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REV2K10
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I have replaced the cap and rotor, new crank sensor, cleaned injectors, new gas tank, new fuel pump, new fuel lines, new plugs, wires, replaced coil, done just about everything you could possibly change for it to start, but still will not turn over. Engine was just swapped from out of an Oldsmobile Bravada. Both are Vortech. Engine cranks, will run if fuel is poured in the throttle body, but shuts off when that fuel is spent. I'm just about to give up on this thing.
Feb 7, 2023 at 1:50 AM
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STRAILER
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Can you run the codes to see what comes up? Also, when you turn the key on without cranking the engine over do you hear the fuel pump run in the tank for about 5 seconds? If not, there is a fuel pump relay location so you can swap it out, also is the security light flashing when you try to crank it over?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

This guide can help as well:

https://www.2carpros.com/articles/car-not-running-advanced

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Feb 7, 2023 at 6:49 AM
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REV2K10
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Fuel pump runs, also has a new relay I replaced. Like I said, I've got great fuel pressure at the schrader valve. Shows no stored codes. Unplug MAF, Still won't run. Also have tried it in Neutral. No security lights are flashing. Only lights flashing Air Bag and the ABS and E-Brake come on. E-brake shortly after goes away.
Feb 7, 2023 at 8:14 AM
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REV2K10
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May have figured out the problem. Failed injectors. There was continuity at the plug, so I took the intake manifold off. Pulled injectors, put 12v to the injector prongs, they would click soon as you would touch the wire to the prong but failed to open at the injector port nipple. Stay tuned, going out to my parts motor to pull injectors off of it. May be a few hours as I have to find a lift due to my vehicle being under the weather. Fingers crossed.
Feb 7, 2023 at 1:06 PM
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REV2K10
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Fuel Injectors were the culprit.
Feb 8, 2023 at 3:26 AM
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STRAILER
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Nice work! glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
Feb 9, 2023 at 2:52 AM
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