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Old 08-23-2010, 02:34 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: Need some help with ICM, code P0304

You are correct about the icm being problematic and the more likely of the two ignition parts to fail. You can try pulling out all three; plugs, ignition coil pack and icm to lay out on top of the engine, all connected together for a spark test with the plug bases grounded to the engine (use wire if you have to). A simple blip of the starter should confirm spark plug #4 not firing. If I'm not mistaken, the coil pack consists of a pair of coils to fire the four plugs, making the coil pack less likely to fail.
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