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Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1668
Experience:  Auto Technician
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It turns over but wont start. I've replaced the purge and

Customer Question

Hi there, it turns over but wont start. I've replaced the purge and vent sensors for the fuel line and still nothing. I'm assuming it could be the cam shaft sensor?
JA: Are you certain it's the fuel pressure sensor that's in need of attention? What about the fuel rail? Have you checked it yet?
Customer: Not yet, I thought it could have been the fuel filter but I guess it doesnt have one. I can hear the pump running as well.
JA: What is the model/year of your Chevy?
Customer: 2008 impala 3.9
JA: Are you fixing your Impala yourself? What have you tried so far?
Customer: purge solenoid, Vent solenoid, Throttle body pos. and gas cap
JA: Anything else you want the mechanic to know before I connect you?
Customer: The pump sounds like its working on overtime before I start it. sometimes wont let me start it without it running completely. fuel pump*
Submitted: 9 months ago.
Category: Chevy
Expert:  Dan replied 9 months ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Expert:  Dan replied 9 months ago.

Do you have any codes?

Expert:  Dan replied 9 months ago.

Do you have a fuel pressure gauge?

Customer: replied 9 months ago.
I dont have a gauge but one code specifically was p0449
Expert:  Dan replied 9 months ago.

That code will not cause a no start condition. You need to check fuel pressure, injector pulse, spark, and compression. If you have a no start, then you are missing one of the four.

You need a fuel pressure gauge, noid light, spark tester, and compression gauge to diagnose. I would start with checking for spark.

Expert:  Dan replied 9 months ago.

Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.