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Old 10-12-2015, 02:05 PM   #1
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Sporadic P0303 Code

I have been battling an intermittent P0303 code for some months now. The times that it has been showing up has always been during idle, never during driving.

My car has 53,000 miles on it. Like I stated, this intermittent code has been coming on for several months now. I have swapped all of the coil packs around several times amongst each other, to see if the problem would stay at cylinder three, or move. Nope, still misfire on cylinder three.

About a month and a half ago, I put in eight brand new OEM spark plugs. I also put an o-ring on my crankshaft position sensor and did the neutral crank relearn myself. The misfire code went away for several weeks, but it has since returned. Cylinder three again, only.

I have used a long screwdriver as a stethoscope so that I could hear the fuel injector clicking, and the fuel injector on cylinder three clicks with the same sound and clicks at the same frequency as all of the other fuel injectors.

I am lost now. Should I replace all of my fuel injectors? Can Ford do some kind of electronic diagnosis and tell me what is wrong?
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Old 10-12-2015, 02:23 PM   #2
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Stock? Mods?
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Old 10-12-2015, 03:13 PM   #3
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My car:

2013 Mustang GT
Automatic
AED datalog tune
JLT plastic cold air intake
Lethal stainless offroad h pipe
Lethal over axle pipes
GT500 single-tip mufflers
UPR firewall catch can

The new spark plugs are the OEM motorcraft plugs. I believe they were all gapped at .050 +/- a small amount

My handheld I am using is a SCT X4.
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Old 10-12-2015, 04:33 PM   #4
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Have you run this by Shaun? Or sent him logs so he would be able to see what's going on?
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Old 10-12-2015, 10:28 PM   #5
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The logs I sent him about a month ago for my offroad h-pipe install did not seem to alarm him.
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