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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 2373
Experience:  GM Grand Master Technician 2007. 14 years experience.
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On my 04 grand am 3.4 I have fule pressure and spark I

Customer Question

on my 04 grand am 3.4 I have fule pressure and spark I changed the cam and crank sensor but stil will not start
Submitted: 8 months ago.
Category: Pontiac
Expert:  Edward replied 8 months ago.

Hello, Eddie here and I will do my best to help. If you have fuel pressure, and spark, it's likely you are missing injector pulse. Can you get a noid light, (usually you can borrow one from a local auto parts store for a small deposit and get your deposit back when you bring the tool back) The noid light plugs into the injector harness in place of the injector. It will blink when cranking indicating injector pulse. Or if you spray some starting fluid in it, does it hit or run briefly then? Is the security light doing anything odd? Let us know, Thank you.

Customer: replied 8 months ago.
I have droid lights going to check that later also spraying the starter fluid
what would cause the injectors to not fire?
Expert:  Edward replied 8 months ago.

Injector pulse is provided by the ECM. It may be a passlock key issue. or it could be the ECM itself. If you just turn the key ON, does the security light go out? or does it stay on? just above the 2500 mark on the tach or so.

Customer: replied 8 months ago.
I'll check later
Expert:  Edward replied 8 months ago.

Alright, let us know, Thank you.

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