Any technical information on a 99 Pontiac Grand Am 4 cylinder?

«Da Latin Pride«

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Well, to be detailed but quick, I have a 99 Pontiac Grand Am with a 2.4L Twin Cam Engine from GM. I got a P0200 code that will not go away. The car is idling a little rough and gasoline is coming out of the exhaust in large quantities. Cylinders 1 through 3 spark plugs are burning with heavy carbon deposits, cylinder 4 spark plug comes out flooded, wet, dripping pure gasoline.
I've replaced spark plugs, wire sets, ignition coils, camshaft position sensor, and the bad injector but it's still doing the same thing. I have tested the Ignition Module, a spark test for the plugs, the Injectors and even a compression test on the engine. Everything has passed so far except in cylinder number 4 the circuit on the injector seems to be open permanently. The injector is brand new, so there is no chance it can be bad. But I took a diode circuit light tester and the circuit that feeds the fuel injector intermittently seems to have permanent voltage which means the injector is staying permanently open flooding cylinder 4. I think this is stealing the pressure from the other cylinders which is causing the other 1,2 and 3 cylinders to burn rich in air and create the heavy carbon deposits. Any ideas what could be causing this? Timing, a crank angle sensor... any ideas?
 
i had a vehicle once that was doing that and it needed a pcm. the pcm usually controls the ground side of the injectors. if there is an internal fault to the pcm it can permanently ground the injector and and keep it open.
 
same

that happened to my car too.i had to replace my pcm.you could just get a used pcm so you won't have to program it and take it to the dealer justto get it fix.what happened to mine is that i took it to a shop and they said my pcm went bad so i had it replaced but they said only dealer has the ability to program the new pcm so it's was cheaper to just get a used pcm from a juckyard.
but make sure it's the same year and model to your car.
 
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