My Engine will not start up and run?

CDELACRUZ15

MEMBER
2011 CHEVROLET MALIBU
2.4L
4 CYL
2WD
AUTOMATIC
195,000 MILES

The problem started in the winter, I started my car, it ran rough for about 5 minutes, then after a little bit, it smoothed out and drove to work just fine. While I was sitting in my car, waiting for my shift to start, it started spitting and sputtering, and eventually shut off. Every time I tried starting it, it would start then immediately shut off. Got it towed home, thought it was a bad fuel pump, since I cant hear it kicking on when I turn the key. But after replacing it, the problem was still there, and I still don't hear the fuel pump kick on. I've checked fuel pump relay, and even replaced it. And after doing more research, I found it could be a bad ignition switch, which I had just replaced, and all it is doing is trying to roll over, with out the starting then immediately dying. What else could it be?

Sunday, September 8th, 2019 AT 10:21 AM

3 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

Okay, this could be a few different things going on here. Let's start with your vehicle's Crankshaft Position Sensor (CKP). Your vehicle's Power-train Control Module (PCM) uses the signal of the CKP to synchronize the firing of the spark plugs and fuel injectors. If the sensor is failing or the electrical connector is bad or has a loose connection then your vehicle's engine will not run. In the diagrams down below I have included the location, connector end view, and factory test for your vehicle's CKP sensor. If your digital multi-meter (DMM) has the ability to read frequencies, then I have also included another test for the signature of the CKP sensor. This can be done by watching the frequency go smoothly up and down with then engine cranking. I have also included a guide on how to inspect electrical connectors as well. I have also included a wiring diagram of your vehicle's starting circuit for your reference in the diagrams down below as well. Please check out the CKP sensor and electrical connector and get back to us with what you find out. We can go from there if needed.

Thanks,
Alex
2CarPros

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Monday, September 9th, 2019 AT 2:47 AM

CDELACRUZ15

MEMBER
3 POSTS

I haven't had the chance to test the ckp yet, that will probably be this weekend, but I was testing power to all fuses and relays, and I'm not getting any power at all to my fuel pump relay located in the trunk.

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Tuesday, September 10th, 2019 AT 9:46 AM

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello again,

Okay, that's my bad, I thought you said you could hear the fuel pump turning on priming the fuel system when you turned the key to run. So forget about the CKP sensor, it's obviously the fuel pump not getting power. In the diagrams down below I have included a power distribution diagram for the rear fuse panel for your vehicle, where the fuel pump relay is located, as well as wiring diagrams for the fuel pump circuit, a diagram of a four pin relay for reference, and guides on how to inspect grounds and how to check for opens in an automotive circuit. So, with the vehicle's ignition switch turned to the "RUN" position, I need you to take a voltage reading at pin #30 of the fuel pump relay. Next I want you to inspect Ground #302 which I have also included a diagram for and is located in the left "C" pillar. Please get back to us with what you find out and we will go from there.

Thanks,
Alex
2CarPros

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