P0304 2000 Ford Expedition 145K miles (5.4 Engine)

trex1 · **Joined:** Mon Dec 10, 2007 4:30 pm **Posts:** 7

I have a cyclinder 4 misfire code on my Expedition. I replaced the cop and plug and then a bunch of other codes showed up which I may have caused when I changed the COP.(I have a post on the P1XXX forum on those.)

I changed the PCV valve and cleaned the MAF and now am back to the original P0304 code. The old plug electrode looked pinkish I checked the spark and it seems to be ok.

What should I check next? How do I check the injector?

bea

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

Mohawkmtrs · **Posted:** Fri Dec 14, 2007 4:15 pm

You could swap the #4 injector with another cylinder and see if the code changes/follows.

trex1 · **Joined:** Mon Dec 10, 2007 4:30 pm **Posts:** 7

Thanks. Sounds like a good idea. Is taking the rails off and removing the injectors pretty straight forward?
bea

P0304 2000 Ford Expedition 145K miles (5.4 Engine)

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