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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 21438
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Why fuel injectors not working after start up

Customer Question

Why fuel injectors not working after start up
Submitted: 3 years ago.
Category: Car
Expert:  sprinkles08 replied 3 years ago.

Hello and welcome to JustAnswer!


For some reason your vehicle information didn't post with your question. What year and model is the vehicle you're working on?


Many manufacturers will take away fuel injector pulse when factory security hasn't been disarmed and you are trying to start the engine. If you can run the engine on starting fluid then you either have no fuel pressure or it doesn't have injector pulse for some reason.


Have you verified fuel pressure is ok? I see the pump has been replaced but there could be an electrical problem preventing power or ground from making it to the pump.

Customer: replied 3 years ago.

We have fuel pressure

Expert:  sprinkles08 replied 3 years ago.
What was the fuel pressure reading?

What year, model and engine is the vehicle you are working on?

Customer: replied 3 years ago.

About 90 psi, I am working on a 2003 GMC Sierra 1500 V-6 with all the replacements the truck actually starts easier but will not continue to run

Expert:  sprinkles08 replied 3 years ago.
I can only rely on the information given since I can't be there in person so please provide honest answers to my questions.

Have you used a scan tool to check for fault codes?

Customer: replied 3 years ago.

Yes there are no fault codes

Expert:  sprinkles08 replied 3 years ago.
Do you have one wire at the injectors with power while cranking?

Are you seeing a security light come on?

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