I have a 05 expedition with a 5.4 with 172,000 miles. I replaced all spark plugs at 140,000 miles. I'm still getting #4 misfire. I replaced COP and plug and am still getting #4 misfire. I have a loud rattle upon start which goes away. Can anyone help me?
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- Thread starter Myoung78
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Canadianguy
Active Member
Possibly a fuel injector issue?
The rattle might be a timing chain or the plastic guides.
splintrcel
Full Access Members
If its not the plug and not the coil it could be the ignition wiring harness
Dsolis12
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- Apr 22, 2014
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Please let me know what you find.....this exact thing happened to me and I put a new coil a new plug a new Injector and new connectors on the injector and the coil....still misfire on #4. Took it to the dealership and they said low compression on #4 and #5 but no misfire codes on #5. They wanted to tear it down and tell me to do an entire rebuild, best case scenario 2k$. I said no thanks just slight misfire at idle, only has 111k and it's getting 18.7 mpg so it can't be that bad. But I don't know where to go from here. I'm going to start looking at some other posts to see if I can get direction.
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