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Old 02-03-2005, 01:47 PM
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erimar77 erimar77 is offline
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Cylinder Misfire

I hope you guys can help, this is for a 2000 Pontiac Grand AM.

I went to Autozone to get the codes read,

P0204
The PCM has determined that a malfunction exists in the electrical circuit for cylinder #4 fuel injector

P0304
The PCM has determined that a misfire has occured in cylinder #4

I have new plugs and wires from like 5~6 months ago. Could it be the coil pack? This is a semi-random problem, reoccuring every 2~3 months for a couple days at a time. I'm sure it'll run fine for another 3 months before it does it again. It seems to happen more often when it's damp or raining outside.

Quote:
DTC P0204 Injector 4 Control Circuit
Refer to Engine Controls Schematic Power, Ground, and Fuel Injectors .

Circuit Description
The PCM controls the fuel injector control circuit using a Multi Function Driver (MFD). The MFD has the ability to detect an electrical malfunction. If an electrical malfunction is detected, the MFD signals the PCM to set this DTC.

What that basically means is that there's a problem with injector #4s control components. If there isn't a short to ground, or a short to battery positive in the wiring harness, then you'll need to replace your PCM and have it reprogrammed.
This was my response on a grand am forum, you think you could help elaborate?
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