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Old May 14th, 2008, 01:46 PM   #1
Lothos
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Default misfiring on 2003 expedition

My wife has her expedition in to the dealer for the 3rd time now for misfiring #7 &8 cylinders. The first two times they did complete fuel system pressure tests etc... and replaced the plug and coil both times. You guys have any insight I could smack the dealer tech upside the head with on other possible causes? The last 2 years her mileage has dropped from 18-20 city to 15-17. I thought maybe a cat was plugged or something since I've looked at everything typical maintenance would cover.
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Old May 14th, 2008, 08:48 PM   #2
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maybe it needs another coil. very common on 5.4's

a few months ago i put one on a f150, then a few days later another one, then a month later one more.

where do you live? i have a live data scanner and a bunch of good coils.
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Old May 14th, 2008, 08:57 PM   #3
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Are there lean codes also?
Vacuum leaks @ the PCV hose connection can cause leaning of the rear cylinders.
A dirty MAF can also drive the system lean and cause a misfire.
Hope this helps.
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Old May 15th, 2008, 09:07 AM   #4
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I have an older model actron code scanner, so all I get is the p0308 misfire and a p0000 code. I don't think there's a vacuum leak. Dirty MAF maybe.

I'm at the end of Marquette west of Newburgh.

#7&8 plug and coil were replaced March 20th

#8 replaced again last Tuesday.
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Old May 15th, 2008, 09:40 AM   #5
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Weak or broken valve springs can cause this, but it's a long shot.

Injectors or manifold leak can do the same.
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Old May 15th, 2008, 10:01 AM   #6
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Check your heater lines at the firewall. If one of them sprung a leak it could be dripping down on the #8 cylinder causing the coil to burn out but not leaving much trace of being wet as the coolant will burn off when the engine heats up. Just ran into this problem with one of our customers on an F-150 the other day.
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Old May 15th, 2008, 08:48 PM   #7
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Check your heater lines at the firewall. If one of them sprung a leak it could be dripping down on the #8 cylinder causing the coil to burn out but not leaving much trace of being wet as the coolant will burn off when the engine heats up. Just ran into this problem with one of our customers on an F-150 the other day.



Mine is doing this now. I have to fix it soon.
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Old May 16th, 2008, 07:12 AM   #8
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well, they replaced the #6 plug and coil this time. Apparently 6 decided to go the day after 7 and 8 are replaced.

Why, as a dealer doing warranty work, would you not replace all 8 spark plugs and coils on the same visit? Coils I could at least see a little bit of cost debate, but plugs? come on.
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Old May 16th, 2008, 07:19 AM   #9
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Because if its not broke there not supposed to fix it they call up selling warranty work and that is a big no no.
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Old May 16th, 2008, 07:42 AM   #10
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Because if its not broke there not supposed to fix it they call up selling warranty work and that is a big no no.
normally I would agree, but when you replace a "system" you replace the whole system. In this case all the plugs in one go.
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Old May 16th, 2008, 07:59 AM   #11
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I did some looking into other forums online on your problem. I'm just a DIY mechanic but many others have experienced the same problem you have. These coils seem to backfeed to each other and cause the other coil units to mis-fire, so in turn one bad coil can cause other coils to mal-function. Maybe replacing all of them wouldn't be such a bad idea. Expensive I'm sure but may be worth it.
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Old May 16th, 2008, 08:37 AM   #12
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what sucks is the dealer treats each coil misfire as a separate claim and thus $50 deductible asked for each time the vehicle goes in. My bitch is if they're failing left and right, why don't they replace them all on the same visit especially if they backfeed each other.
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Old May 16th, 2008, 09:00 AM   #13
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you can argue that 50 dollar fee. if its not fixed you should be able to take it back under the same claim. my dads excursion, the first year he had it was at the dealer more than it was in the driveway and he only paid one fee. for a few different problems. what dealership?
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Old May 16th, 2008, 09:06 AM   #14
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Village and North Bros
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Old May 16th, 2008, 09:09 AM   #15
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o have you ever been to pat milliken on telegraph? there a great dealership. my dad bought his truck at tom holzer and it kept goin back and they did the same thing one part at a time. well it went to milliken and they replaced the entire harness. and the problem was gone
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Old May 16th, 2008, 09:21 AM   #16
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my wife's mulling trade in possibilities atm. She owes $6k still and trade in is between $9-12k. 6 year buys are a terrible idea. Trying to talk her into hanging on till the Flex launches. That's really a nice car. Almost as much room as the expedition and alot better mileage.
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Old May 16th, 2008, 09:25 AM   #17
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huh well i wish ya luck with the problem
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Old May 18th, 2008, 09:13 AM   #18
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wow your just a few minutes away from me. im at Joy and Newburgh.

i am not surprised being you had it at north brothers.

if you need any help in the future let me know.
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