Cranks but will not start

JOHN CAREY2

MEMBER
2007 CHEVROLET COBALT
2.2L
4 CYL
2WD
AUTOMATIC
160,000 MILES

It was running perfectly fine, and one morning it would turn over but wouldn't start. I replaced the battery because it was bad but still won't start. I checked the fuses, and I can hear the fuel pump still and there's no codes.

8 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

Hello,

This sounds like the crankshaft angle sensor went out. To confirm lets check the ignition system for spark. This guide will help us with diagrams below to show you where the sensor is and how to replace it:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Is the security light flashing? if so this guide will help:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Check out the diagrams (below). Please let us know what happens.

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Wednesday, July 29th, 2020 AT 12:07 PM

JOHN CAREY2

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5 POSTS

Update: I sprayed starting fluid down the throttle body and it ran fine for a second, and I checked and saw there was no fuel filter, however I still hear the fuel pump. So I would assume there’s a blockage in the fuel lines or maybe somewhere else I could check/clean out?

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Wednesday, July 29th, 2020 AT 12:07 PM

KEN L

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Okay, with the key on do you have power at the ECM fuse #41 and INJ fuse #45? This guide will help with the fuse location below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what happens.

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Wednesday, July 29th, 2020 AT 12:07 PM

JOHN CAREY2

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5 POSTS

I have power on both, however determined that the fuse for the fuel pump has no power going to it, and now it will start for a second and stall consistently.

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Wednesday, July 29th, 2020 AT 12:07 PM

KEN L

MASTER CERTIFIED MECHANIC
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The fuel pump fuse should have power when cranked over. If not we need to test the fuel pump relay. here is a guide and the relay location is in the fuse panel featured above:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please run down this guide and report back. No security light flashing correct?

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Wednesday, July 29th, 2020 AT 12:07 PM

JOHN CAREY2

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5 POSTS

I checked and established there isn't noise coming from the fuel pump, it was coming from something else, and there is power going to the fuse when turning over. I also took out the fuel pump, the tank looks almost spotless inside, however the fuel pump looks nothing like any of the aftermarket ones that I see.

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Wednesday, July 29th, 2020 AT 12:07 PM

JOHN CAREY2

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Also no, the security light just turns on for a second and goes off when the car is on.

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Wednesday, July 29th, 2020 AT 12:07 PM

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

It sounds like the fuel pump went out which is common and can you put 12 volts to the pump to see if it will run. Here are the instructions on how to change the pump out in the diagrams below. Check out the diagrams (below). Please let us know what happens.

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