Persistent DTC P0307
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Fleet Owner
Joined: Aug 2010
Posts: 21,254
Likes: 1,656
From: Reynoldsburg, Ohio
Persistent DTC P0307
2000 E250 w/5.4, approx 287K miles. Fresh plugs done the right way using only the Motorcraft brand. 
P0307 keeps returning despite having had the COP changed out for a brand new MC part, the connector replaced using solder and shrink tube securing it to the wring harness. With cold engine there is nothing like a misfire or usual lugging as a failed COP would cause. Once the engine is at operating temperature the MIL lights up and the usual misfiring COP symptoms appear.
After each corrective action I've taken and DTC's cleared this same thing happens all over again.
I'll be checking the wiring harness back to C116M & C116F---those that mate up to Bank 1's COP/Injector harness then onto the PCM. IF I find nothing amiss with the wring could this be related to the PCM?
According to my scanner there are no other DTC's pending or confirmed. I have noticed LTFT's for Bank 2 are a bit high, STFT's both banks working properly.
Thanks in advance for any help or ideas.
P0307 keeps returning despite having had the COP changed out for a brand new MC part, the connector replaced using solder and shrink tube securing it to the wring harness. With cold engine there is nothing like a misfire or usual lugging as a failed COP would cause. Once the engine is at operating temperature the MIL lights up and the usual misfiring COP symptoms appear.
After each corrective action I've taken and DTC's cleared this same thing happens all over again.
I'll be checking the wiring harness back to C116M & C116F---those that mate up to Bank 1's COP/Injector harness then onto the PCM. IF I find nothing amiss with the wring could this be related to the PCM?
According to my scanner there are no other DTC's pending or confirmed. I have noticed LTFT's for Bank 2 are a bit high, STFT's both banks working properly.
Thanks in advance for any help or ideas.
Thread Starter
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Fleet Owner
Joined: Aug 2010
Posts: 21,254
Likes: 1,656
From: Reynoldsburg, Ohio
#7 is drivers side (Bank 2) third one back from front, like this:
Thread Starter
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Fleet Owner
Joined: Aug 2010
Posts: 21,254
Likes: 1,656
From: Reynoldsburg, Ohio
Thank ya sir--appreciate the insight.
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