Question about 2004 Pontiac Grand Am

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My 2004 Grand am will crank and not start..... it has a new coil pack tried changing control module, checked the fuses, changed the fuel injectors (which are still not working) and fuel is getting to the rail. has new spark plugs........ What else do we need to try???? It's exhausting we have worked on it for 12 hours...

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Just because you have fuel present at rail dosent mean its going threw injectors.there is a fuel pump in gas tank.If this pump is not putting out the right amount of pressure the fuel will not pressurise and spray out of injectors.I would do a fuel pressure check and you might find out you need a fuel pump.I would also check for clogged fuel filter.Dont rule out that this could also be an ignition problem.Check for spark.These few things should help you out.Thats why when you bring to dealer they plug car into computer and analize all the things so the dont change anything the dont have to.As a home mechanic you have to go by process of elimination.But somtimes this can get real costly,never mind very aggervating.Keep your cool and keep going,you have come this far but if i were to guess, id say its your fuel pump and filter.Good luck.

Posted on Apr 08, 2011

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If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
If you having a problem with more than one system, I want to check for rpm signal, that usually comes from the crank sensor. Not sure why you replaced cam sensor? I always want to check sensor wiring circuits before replacing anything. Don't replace anything unless your testing points in that direction.

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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.

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