Water or oil may enter into the ignition coil cover and the spark plug bore, causing a misfire and illuminating the Check Engine Light. A coil with improved water and oil sealing is available and should be installed.Google+
Car Problem Reports
Ford Thunderbird Revised ignition coil available with improved water and oil sealing
Ford Thunderbird Problem
Average Mileage: 45,200 mi (24,000 mi - 88,000 mi)
Numbers 2, 3 and 7 coils failed. Replaced under extended warranty but had to pay for the right valve cover gasket $59 for the gasket, $200 labor.
I have had several costly engine repairs at several Ford dealerships (coils, plugs, etc. to the tune of over $5 to 6K since I bought the car new in 2002. Just recently a non-Ford repair shop finally told be about the windshield wiper leaks that are causing the problems. After yet another costly repair of $890(but less the than half of what I was charged each time at Ford) I paid about $350. to fix the problem once and for all. SHAME on Ford for not telling me and for not covering any of the repairs!!!! Yes FORD...still Found On the Road Dead, F----- On a Raw Deal, and Fix or Repair Daily.
Visitor, 2003 Ford Thunderbird, 30,000 mi
Oil on coils
Visitor, 2005 Ford Thunderbird, 50,000 mi
About every 5000 miles one of those coils fails. The Dealer is replacing them under the extended warranty on the coils, but Ford won't authorize replacing them all a once. They only authorize replacing the one that failed, so I'm stuck going back every few thousand miles when another one fails. I'm at 50000 miles now and the 4th one needs replacing. This has been going on since 35000.
Same old shXX.
Misfiring at idle and higher speeds.