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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 04-17-2012, 09:00 PM
mdec950 mdec950 is offline
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07 expedition 5.4L cylinder 6 misfire

so its running rough and has check engine light cylinder 6 misfire

changed all plugs autolite HT1
changed all coil on plugs
changed cylinder 6 fuel injector

Took off all fuel injectors hand cleaned them with intermittent battery and fuel injector cleaner and compressed air
they are all very clean now

changed cam sensor
changed crank sensor
changed fuel filter
ran premium gas
added seafoam 1 tank ago
cleaned maf sensor with cleaner and air dryed
I have no oil in water
no water in oil

i have cleared codes
swapped items back and forth
and still cylinder 6 misfire

any ideas from you folks that have been on here awhile ????

should i check compression on all cylinders next ?
What is the min max for cylinders usually ? any thing under 100 bad ?

Also works great under 45mph
but when i get up to 60mph the check engine light comes on and cyl 6 misfire and stays on after a couple of times





HELP
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Old 04-18-2012, 11:00 AM
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berry1234 berry1234 is offline
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I would have checked compression before buying any parts.

Part 1 -Troubleshooting Misfire Codes Ford 4.6L, 5.4L
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Old 05-01-2012, 08:28 PM
mdec950 mdec950 is offline
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it was a bad plug from autolite

berry1234 - that was not too helpful

it was a autolite spark plug that was the issue
i changed it to a new autolite same issue
changed to motorcraft sp151 plug and it runs fine now
se to fit
oh compression was 115 and held on a leak down test for 45 minutes

i would have checked compression but the threads are a diff mm size on this one so i had to order a hose for it
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Old 05-02-2012, 11:43 AM
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berry1234 berry1234 is offline
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Quote:
Originally Posted by mdec950 View Post
berry1234 - that was not too helpful

it was a autolite spark plug that was the issue
i changed it to a new autolite same issue
changed to motorcraft sp151 plug and it runs fine now
se to fit
oh compression was 115 and held on a leak down test for 45 minutes

i would have checked compression but the threads are a diff mm size on this one so i had to order a hose for it
I think it was. Replacing multiple parts hoping it fixes a problem is not a good idea. Start with the basics. Diagnosing, testing, etc. spending money.

Regardless, I am glad you found the issue. I have heard anything other than Moto spark plugs will cause problems.
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Old 05-11-2012, 08:09 PM
mdec950 mdec950 is offline
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oh its fixed

no "real thanks" to anyone on these forums
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Old 05-14-2012, 12:22 PM
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berry1234 berry1234 is offline
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Then maybe you should go elsewhere. I offered advice. You didn't like it. It was solid advice. Throwing parts at a problem is ridiculous by any mechanics definition. It's a waste of money.
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Old 05-14-2012, 12:22 PM
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