P0354 code for 2007 5.4L 3v help needed
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P0354 code for 2007 5.4L 3v help needed
There’s a P0354 code for the #4 cylinder on a 2007 5.4L 3v, here is what is known and been done so far:
- New plugs and COPs have been installed; all 8 cylinders
- The COP on the #4 cylinder was cracked (see picture below)
- Wire from the ECM to the COP of the bad/#4 cylinder; after new COP and plugs
- Pigtail connector to the COP was replaced
- Continuity checks at the pigtail are good and match a known good cylinder/COP
- Voltage checks good at the pigtail and match a known good cylinder/COP (though both seem to run a bit low at 10V)
- NOID test on the #4 COP pigtail harness does NOT flash, but does flash on the #2 cylinder (a good cylinder)
- Swapped #4 and #2 COP and plugs.
- Pics below; the #4 plug is the one with the dark ceramic at the tip - both have less than 100 miles on them.
Update 2/28: This video was very helpful in confirming the ECM could fail in its ability to support a specific coil pack:
. In short, there’s something called a ‘Moët’ switch for each cylinder, that can be fried/fail.
Any thoughts on the ECM idea or what to do next?Thanks By the way, if you haven’t run across ”FordTechMakuloco” on YouTube, he’s a veteran and former Ford technician with his own shop who posts some really good videos on repairing F-150s. 
Last edited by JD Evigilo; Feb 29, 2020 at 12:28 AM.
