has a crank no start issue?

2003 CHEVROLET IMPALA
190,000 MILES • 3.4L • V6 • 2WD • AUTOMATIC
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TOM FLOWERS
My car listed above has a crank no start issue. I've replaced crankshaft position sensor, starter, fuel filter, coil pack, even the fuse box and wire harness under the hood. I have 49 PSI at shader valve and test spark with the old fashion screwdriver in the plug wire and I have spark when I shoot it with starting fluid. It will run until it runs out of gas. It runs great as matter of fact but turn it off and back to crank no start up.
May 18, 2025 at 4:34 AM
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STRAILER
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It sounds like the fuel injectors are not opening, if you have a shorted injector, it will shut down the driver inside the PCM. I would remove one of the injector wires to check for 12 volts and a trigger signal while cranking.

Here is a guide to help you:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please go over this guide and get back to us.
May 19, 2025 at 11:42 AM
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TOM FLOWERS
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everything checked out as it should. What else have you got? Every time I think I'm going to find out what wrong with my car I get let down. hope you can help.
May 23, 2025 at 2:37 PM
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TOM FLOWERS
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Okay. Does this engine have 1 or 2 crankshaft position sensor or 1?? I was just informed that the 3.4l has 2 , the one behind the harmonic balancer and one on the side of the motor by the firewall, which communicates with the ignition control module, is that true? Not sure what I'm gonna do with that info but got to know.
May 23, 2025 at 7:42 PM
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STRAILER
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To confirm, you say it runs on starting fluid correct? So the ignition system is working, also the injectors are getting pulse (ground and power 12 volts) correct? Yes this engine does have two crankshaft sensors.
May 25, 2025 at 10:58 AM
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TOM FLOWERS
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A couple shots of starter fluid starter fluid and she comes to life. Now the cooler it is outside takes a little more. On a side note, my cooking fans won't come on thought they were fried until I hard wire straight to 12v they not fried. Keeping those 2 factors in mind I replaced the coolant temperature sensor and it changed nothing (wish I would have done that when I was messing with the injectors that was a pain in the you know what) now I did change throttle position sensor and now she'll starts back up soon after I turn her off but if I wait a few hours she needs that drink (a buddy recommended AA... He's a moron). Okay, behind the harmonic balancer is 1 CPS and the other is the one connected to the ignition control module correct? And where is the camshaft position sensor? Typing on this phone is making my thumbs sore, your turn.
May 26, 2025 at 7:21 AM
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STRAILER
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Yes, one crankshaft sensor runs the ignition and the other the injector system, if you replaced one I would do the other. Here are the locations. Check out the images (below). Let us know how it goes.
May 26, 2025 at 12:44 PM
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TOM FLOWERS
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Thanks I'll keep you posted. By the way can you tell me where the cam position sensor is?
May 26, 2025 at 1:11 PM
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STRAILER
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Np, here is the camshaft sensor location. Check out the images (below).
May 27, 2025 at 9:44 AM
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TOM FLOWERS
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Is 46 PSI on my fuel enough to start this car.
May 28, 2025 at 12:08 PM
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STRAILER
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Yep, that should work. I would go over this video to help you see why the engine will not start and run.

https://www.youtube.com/watch?v=lXLJbuAZ4CE&t=1s&pp=0gcJCbAJAYcqIYzv

Please go over this guide and get back to us.
May 29, 2025 at 10:34 AM
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