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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 2003 chevy trailblazer 4.2l. I was driving on the

Customer Question

I have a 2003 chevy trailblazer 4.2l. I was driving on the freeway on cruise control when suddenly it shut off and i had no acceleration at all. Managed to pull over to a gas station. I pushed the accelerator to the floor and the rpms only went up to 3000. At the gas station. I shut it off. Let it cool down. Started it. Ran for 5 seconds then died. Now it barely turns over and when it does it dies immediately. Fuel pump, filter, and regulator have been replaced within 2 years. All coils and plugs replaced 1 week ago. How should i troubleshoot?
Submitted: 5 months ago.
Category: Chevy
Expert:  Chad Farhat replied 5 months ago.

Hi my name is ***** ***** I will be assisting you today

Expert:  Chad Farhat replied 5 months ago.

sounds like the throttle body ?

how many miles on it ?

have you scanned since it failed , and what are the codes if any .?

1- do you have fuel pressure now ?

2- do you have spark now ?

let me know please

Thank You ***** ( aka -Customer)

ASE Certified Tech

you need noth to fire ,so are you missing one or both can you check for me ?

Customer: replied 5 months ago.
123000 miles. Throwing a code p0171. Cleaned the thottle body. Ran for a few seconds more before dying. I hear a sound coming from the fuel pump when i turn the key position to ON.
Expert:  Chad Farhat replied 5 months ago.

that P0171 is o2 sensor code

do me a favor check the fuel pressure of pump with a tester tomorrow

and check if you getting power to pump with switch in start position, since we know you are hearing the pump comes on for few seconds on the switch in the on position like u said u hear it and that is what it supposed to do is to prime the fuel rail so that part is working but are we still getting power at turn of switch to start ?

like when u r starting it are you still getting power to pump and also the fuel pump relay , I will send a picture of that tomorrow

and are we getting spark now have you checked

I m about to sign off check those things and let me know

I will be online all weekend from 10 am till 12 pm .

Thank You

Chad Farhat ( aka -Customer )
ASE Certified Technician

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