Wednesday, November 24, 2010

How to Replace Fuel Injectors?

I have a 2003 Pontiac Grand Prix SE, and it appears that one of my injectors is bad. I want to replace it, and I have the Haynes manual, but it doesn't seem to match up with my model.

As far as I can tell, the fuel rail and injectors are underneath the intake manifold. Does anybody have any experience replacing the fuel injectors on a grand prix? Do i just need to remove the intake manifold?

Also, are the intake manifold gaskets reusable? or will I need to replace it when I change the injectors.

Thanks for your help.How to Replace Fuel Injectors?
Yes you have to remove the plenum. (upper intake). After you get that out of the way theres three 10mm bolts that have to be removed in order to lift the fuel rail. Do yourself a favor and don't disconnect the fuel lines from the rail. It's work you don't have to do.theres also a small clip that holds each injector in. as for the gaskets. you can only if your able to get the plenum off without destroying them. Also keep in mind that those engines can trap air in the cooling system. Be sure to bleed it properly.How to Replace Fuel Injectors?
I have the 3.1 engine and my codes are telling me that my 2 injector is stuck open. the car is also running very rich. I don't see how they would be accessible without removing the intake manifold. Anyone up for giving me some step by step directions? Thanks..

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How to Replace Fuel Injectors?
it probably has the 3800 engine so you don,t have to pull the intake. all you have to do is let the fuel pressure off, unhook the fuel line to the fuel rail, unhook the battery, take the harness off all the injectors, take the fuel rail off and pull the bad injector out, oil up the new injector 0-ring, install the injector, and put it all back together but after you get done don,t forget to bleed the air out at the fuel rail.