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Persistent DTC P0307

 
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Old 06-21-2019, 07:26 AM
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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.
 
  #2  
Old 06-21-2019, 08:55 AM
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Okay I know you probably have the right one, but just to be sure...how many cylinders back and on which side are you giving this attention to?
 
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Old 06-21-2019, 10:35 AM
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Originally Posted by alloro View Post
Okay I know you probably have the right one, but just to be sure...how many cylinders back and on which side are you giving this attention to?
No worries---better to ask than "assume" huh? I'd do the same.........

#7 is drivers side (Bank 2) third one back from front, like this:


 
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Old 06-21-2019, 07:39 PM
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Donít chase electrical until you check mechanical.
Compression test and leak down test.
Or easier: get a borescope in there.
 
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Old 06-23-2019, 10:02 AM
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Originally Posted by JWA View Post
No worries---better to ask than "assume" huh? I'd do the same...
In that case it's starting to sounds like there might be an intake leak at the #7 or a burnt valve.
 
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Old 06-23-2019, 10:22 AM
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Originally Posted by alloro View Post
In that case it's starting to sounds like there might be an intake leak at the #7 or a burnt valve.
I'll take one more run at this by swapping the plug and COP for known good parts---I may have unknowingly installed a DOA part. If this persists even then I'll consider a new intake or completely new/reman'd engine,

Thank ya sir--appreciate the insight.
 
 


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