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Working on a '07 Chevy Pickup. Put a new rebuilt motor in…

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Working on a '07 Chevy...
Working on a '07 Chevy Pickup. Put a new rebuilt motor in the truck and the engine is turning over and starting but then turning off shortly after sitting idle for only seconds. I thought it was a fuel injector problem but the fuse and relay both are getting power. I'm also getting a P code 0523 regarding to an engine oil pressure sensor fault but the sensor seems intact and the fuel pressure is 60 PSI. Wondering if anyone has any experience with this kind of issue. The truck only starts when you put gas in the throttle body.
Submitted: 5 months ago.Category: Chevy
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Answered in 16 minutes by:
3/15/2018
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago
Todd Audette
Todd Audette, Chevy Technician
Category: Chevy
Satisfied Customers: 427
Experience: Chevrolet Technician
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Hello, my name is***** to just Answer! I will be assisting you with your vehicle questions today. Will it stay running after doing that

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Customer reply replied 5 months ago
Hi Todd, no it won't stay running for more than about 5-10 seconds after doing that.
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

Have you checked fuel pressure

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Customer reply replied 5 months ago
fuel pressure is at 60 PSI
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

what was the reason for the engine replacement

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Customer reply replied 5 months ago
The old engine had bad lifters which damaged the camshaft. The engine was completely replaced there is a new rebuilt motor in the car..
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

have you made sure all of the grounds are connected......especially any that bolt to the back of the heads

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Customer reply replied 5 months ago
all of the ground is connected the problem is the fuel injector isn't spraying but it has power going to it.
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

Have you tested injector pulse on the injectors with either a noid light or a test light while cranking to see if it flashes on and off

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Customer reply replied 5 months ago
I tested it with a test light with the ignition switch in both the on and off position. It has power.
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago
I know...test across the connector while cranking and see if the test light flashes
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Customer reply replied 5 months ago
hey Todd, we got the vehicle running and now we are getting a random misfire from the truck.
Customer reply replied 5 months ago
The running now but the check engine light blinking code 0300?
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

Do you know what cylinder is misfiring....

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Customer reply replied 5 months ago
no it says random misfire.
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

Can you look at live data with your scanner

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Customer reply replied 5 months ago
no I can not.
Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

There is no way you can find what cylinder or cylinders are misfiring without that. You would have to start guessing. Could be injectors, bad fuel, spark plugs, coil etc

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Chevy Mechanic: Todd Audette, Chevy Technician replied 5 months ago

How are you making out

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