Misfire Cylinder # 3

:confused: 2000 gtp error codes po203 (injector circuit open cylinder 3) and po303 (cylinder 3 misfire) i think i need to replace injector # 3 and was wondering if anyone has gone thru this procedure? looking at the chilton manual it seems possible to do on my own i am just a bit confused on if i need to remove the whole fuel rail assembly or can i just pull out injector # 3 by itself without taking off the fuel rail. if anyone has any info on this it would be greatly appreciated. //

Welcome to AF

Replacing that injector will require removing the fuel rail. Before you blame the injector though, double check the wiring to it, as a wire could be broken and/or cut. A noid light would let you know you're getting signal to the injector, which would let you know if it's an injector or the harness.

It seems to me that these pontiac's have a thing for misfire #3 cylinder! I would check the wiring!