An illuminated Check Engine Light could indicate that one or more of the ignition coils has failed due to excessive spark plug gap. To fix this problem, the ignition coils that have failed, the spark plugs, and all coil boots should be replaced.Google+
Car Problem Reports
Ford Expedition Ignition Coil Failure Due to Excessive Spark Plug Gap
Ford Expedition Problem
Engines Affected: 4.6L V8, 5.4L V8
Average Mileage: 131,083 mi (48,000 mi - 200,000 mi)
Visitor, 2005 Ford Expedition, 95,000 mi
when you get the sprrd up to 40 mph it feels like it starts skipping and you speed up it stops
Visitor, 2008 Ford Expedition, 48,000 mi
All of a sudden no power and my engine was backfiring. Had the computer checked and 3 ignition coils came up bad along with the oxygen sensor. No problems what so ever before this. Art Hill Ford quoted me $280.00/Ea to replace the sensors. WOW!! No Thanks. Checked on the part and they cost $40.00/ea plus you have to remove 1 screw to get the coil out. Takes about 5 min. per coil.
Visitor, 2003 Ford Expedition, 5.4L V8
The ignition coils are always going bad. Very frustrating.
Visitor, 2005 Ford Expedition
Spark plugs have been changed and the coils have been changed too but the check light keeps coming on!!!!
Visitor, 1997 Ford Expedition, 4.6L V8, 200,000 mi
misfire on #1 cyl code 301...changed plug 2months again code 301 misfire... changed coil pack... all good 6mo
Shuddering hesitation when accelerating and very low power. Check engine light went on after a few weeks of this(flashing initially, then full on). when I let it idle for 30 minutes, the engine light went off completely, but still hesitates badly. Others have said just replace the spark plugs. They apparently break often on this vehicle and minimum cost is $450 before using the tool specially designed to remove broken plugs, which I'm told has meant a $1200 tune up for others. I should also mention that I bought the truck 5k miles ago from Suburban Ford in Sterling Heights, MI.
Visitor, 2006 Ford Expedition, 82,000 mi
hesitation when accelerating....all sparkplugs replced & coil...$850 at Ford!
Visitor, 2003 Ford Expedition, 5.4L V8, 141,000 mi
Check engine light came on and read #4 cylinder misfire at start-up. Shop replaced #4 spark plug and ignition coil. $250. Said rest of the spark plugs could be put off for now to save money.
Visitor, 1997 Ford Expedition, 5.4L V8, 139,000 mi
Had to trade in because Ford stated that the motor was gone.
Rainy day, hit a puddle near a corner (though not any deeper than about 6in) whilst turning at 10mph. CEL came on, flashing and alternately staying on at speed. Got worse over 2 days (dealer would not fix - Easy Credit Auto, OKC, OK), so I had to wait the weekend and drive across town to have repair done. O'Reilly Auto said code reader showed 2 plug packs back, but the mechanic who worked on it (the Credit Auto dealer warranty garage) 'repaired a leaking coolant line, removed, cleaned & regapped the plugs'. Engine is now running fine, but I'm most confused by all this!