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75 Triumph, 84 Dodge Rampage, 2007 Spectra
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Discussion Starter · #1 ·
Got this car two weeks ago. Ran great when I got it, but then all of a sudden, started running crappy, misfiring. Low power. Pulled the code and it showed P0304, Cylinder 4 misfire. Car has 57,000 miles. Other than possible plug, wires, and injector, any other things jump out?

I plan to go at it in the next couple of days, didn't know if this was a common occurance in these cars. I figure a coil, if bad, would probably affect all cylinders equally?

Thanks
 

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2008 SpectraSX, 2014 Optima LX,2006 Jeep Liberty, Linux Mint Mate
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6,959 Posts
I replaced the plugs in my wife's 07 Spec just around the same mileage (59k)this past fall.
It was JUST after replacing the timing belt (required at 60k) and the AC belt.
I got the same CEL... Turns out the original "Champion" spark plug ceramic insulator on the center electrode had cracked up inside and fell down over the electrode where the gap is supposed to be...Got rid of the Champions and replaced them with NGKs...Problem solved!
BE SURE TO REPLACE THE TIMING BELT or reap the consequences of a trashed engine.
Dave
 
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