Question about 2004 Pontiac Sunfire

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Car just stop running i change fuel pump that not it.

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  •  chris crum
    chris crum Feb 20, 2012

    It was crank sensor that was bad not opening fuel injectors



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To start with you need to diagnose what the cause of the vehicle not runing is. It takes to things to make a car start, fuel and spark. Find out which one of those things are missing like are you not getttting fuel and if not do you have power to the fuel pump if you are then most likely it is the fuel pump but seems this is not in your case. Find out if you are getttting spark to your spark plugs. If not then you need to diagnose that to find out the cause of not getttting any spark. At this point this is all I can help you with until you can narrow down where the loss is. I hope I was able to help a litle in any case.

Posted on Feb 18, 2012


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SOURCE: 2003 pontiac grand am 2.4 car won't start changed

Your problem is in the security system. That will disable the fuel system, so a theif cant steal your car. I'd bet you will need to change the key and sensor for the key, it's part of the ignition switch.

Posted on Jun 19, 2009

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SOURCE: have 94 grand dam change fuel pump change presure regulater and relay pump stays runnig and car wont start

If by cranking you mean the engine starts then you are having fuel issues. If the car starts with starting fluid then you either don't have fuel pressure or the injectors are not opening. After starting with starting fluid does it continue to run until you shut it off or does it shut off on its own?

Either way you will need to install a fuel pressure gauge to make sure you have enough fuel pressure. If you do have fuel pressure then you will need to make sure the injectors are firing. There is a tool available called a noid light or injector pulse light. You will need to unplug one of the injectors and plug this tester into the connector. If the light flashes while cranking then the injector is being companded to fire. If the light does not flash then you either have a bad engine computer or a control module. More than likely it is the control module. The control module uses the input from the crankshaft position sensor to fire the coil and the injectors the module may be loosing the signal for the injector.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Posted on Nov 22, 2011

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