Misfire? Diagnosing bad CPS or Injector?? - Ford Powerstroke Diesel Forum
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Old 06-12-2009, 10:45 AM
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Misfire? Diagnosing bad CPS or Injector??

How do I know if Iím losing an injector? I donít have any unusual colored smoke. My only symptom is an occasional ďmissĒ although I donít know for sure if itís a misfire. On a gasser, I would bet the ranch that it would be either a coil, spark plug, or plug wire. Being a diesel, none of those components exists.

I bought a new CPS which arrived today. I hope thatís the culprit. Any other tips on diagnosing a misfire?

Oh, my only modifications are SuperChip programmer and aftermarket intake. Miles are 190K


THANKS!!

-DW
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Old 06-16-2009, 01:29 AM
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Hi from Australia.

I have an 04 F250 (they went upto 06 her in OZ) with the 7.3 and I had something similar to what you describe, an occassional "miss". To cut a long story short it turned out to be a faulty injector pressure sensor.

I don't know what the codes were as the dealer never wrote them down on the service sheet but it might be worth a try.
Regards,
Bill
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Old 06-16-2009, 11:04 AM
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Well I swapped out the CPS. Found one new on ebay for $21+s/h. Runs smooth as can be now. Fixed fo rless thatn $25!!
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