Thread: Misfire problem
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Old 10-01-2013, 10:42 PM
Humboldt Br(why)an's Avatar
Humboldt Br(why)an Humboldt Br(why)an is offline
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Join Date: Oct 2013
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Vehicle: 2004 Dodge Ram 1500
Trim Level: SLT
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Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
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Default Misfire problem

Hello All,

Last night on the way home from work I starting noticing a misfire, then my CEL appeared. Ran the code reader and got a P0303. Stopped by the parts store and picked up a Champion plug, then proceed home (no tools in the truck).

Got home and the parts store gave me the wrong plug. So I checked the gap (which was larger than 0.040).

My thought was to test the plug (in case the coil had gone bad). So I put the problematic plug (after i re-gapped) and put it in the #1 position.

Cleared the code, re-started the truck and then I got a P0300

Next day,
Got the correct plug and replaced the suspected fouled plug. Cleared the code and restarted.

No codes, but the truck still misfires.
Wont rev above 4000 while in park.

My volt meter is at work, so I cannot test my battery tonight. But this is what I think might be going bad???

Plugs,coils, and O2 sensors were replaced less than 1 year ago.
Battery is 4+ years old.

Is there anything else to look for?

Thanks in advance for any input.


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