Report: Ignition Coil Failure Due to Excessive Spark Plug Gap
Ford F-150 Problem
Engines Affected: 4.6L V8, 5.4L V8, 6 Cylinder, V8
Average Mileage: 115,081 mi (48,876 mi - 185,000 mi)
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.
Visitor, 1997 Ford F-150, 5.4L V8, 136,000 mi
i was driving and i herd a pop like something hit my hood and then the truck sounded like a motorcycle, i took it to a friend and he said the # 4 plug popped out. so he fixed it for me but a year later i still have problems with misfire on #4 had new boots put in but every six months still misfires
Visitor, 2003 Ford F-150, 4.6L V8, 145,000 mi
Engine cut out during light acceleration. More often on warm weather
Visitor, 2000 Ford F-150, 4.6L V8, 157,768 mi
Vehicle started skipping intermittently, expecially noticable when I accellerated. I replaced the ignition coil.
A couple years ago I was driving home and all the sudden engine light came on and car started sputtering/ misfiring around 50 miles per hour. Had full tune up done which cost a lot of money, replaced all spark plugs and coils. Since then every few months same issue with 1 coil = #5. Replace spark plug and coil/boot assembly and good for another couple months, pain in the butt. UNHAPPY Truck has been taken care of ... only has 115,000 miles and should not have to deal with this every few months :(
If the spark gap is set to Ford's spec.s, what the h... is the gap that will keep the d... coils from blowing. I have experienced failures about every 3 to 6 months for the last couple of years. Going send me right back to Jap trucks.
Visitor, 2004 Ford F-150, 5.4L V8, 96,000 mi
misses when i go to accelerate
Visitor, 2006 Ford F-150, 5.4L V8, 128,000 mi
engine was missing between 40-50 mph until the check engine light was continuosly lit no codes were revealed. mine was the number 1 cylinder i replaced just the one as 1,000 for all 8 is out of my budget.
Visitor, 2005 Ford F-150, 5.4L V8, 119,062 mi
Engine light came on ran test with scanner found a miss fire code. Found bad coil removed spark plugs all where bad along with one coil. 2 of the spark plugs where stuck in the head and had to be removed coasting extra money. now it runs great.
Bought used truck with 100K on meter; at about 120K, the engine began eating coils about 1 each year for the last couple of years. First was #4 in the summer, then #6 the following spring, now, #5 in the mid of winter. "Check Engine Light" didn't come on until the miss was very bad.
Visitor, 1997 Ford F-150, 4.6L V8
this will happen over and over again if you dont use motorcraft coils and use dielectric grease on the boot and put new plugs in.