The Check Engine Light may illuminate, the engine may run rough and have misfires on acceleration. Commonly the ignition coils and/or the ignition coil boots are the cause of this problem. The rubber boot that insulates the coil to the spark plug can dry and crack allowing arcing. Inspect the coils and boots, and replace them as needed. Our technicians also recommend replacing the coil boots any time the spark plugs are replaced.
Car Problem Reports
Ford E-150 Rough Running Engine and Possible Check Engine Light
Ford E-150 Problem
Engines Affected: 4.2L V6, 4.6L V8, 5.4L V8
Average Mileage: 90,922 mi (41,000 mi - 150,145 mi)
Visitor, 2003 Ford E-150, 4.6L V8, 65,000 mi
the motor started missing lightly at first and real bad later. after scanning it was found to have a bad coil #7 cylinder i believe. I replaced the coil and problem was solved,but only for about three weeks, and it started all over again. I replaced the coil again and problem solved for about three weeks again. This missing is usually bad with acceleration. can the coil boot be the problem,and if so why does it not miss for about three weeks.
Engine stumbles going uphill at times, hesitates at other times on flat road. Hesitates on acceleration from stop. Got "#5 cylinder misfiring" diagnostic message. Ran great for 2 days, then same problems.
Visitor, 2000 Ford E-150, 4.6L V8, 82,000 mi
replaced only select coils. Vehicle is doing better but still running rough when it goes uphill or putting a load on it.
Visitor, 2000 Ford E-150, 5.4L V8, 150,145 miRookie
driving down the road the check engine light starts flashing and the front end starts shaking then it stops for a while and does it again real sulgish during this time
Visitor, 2005 Ford E-150, 4.6L V8, 64,000 mi
Had same problems over about a 6 week time frame. After replacing coil wires, boots, a fuel pump, and spark plugs the dealer finally sent data to Ford. Within an hour Ford diagnosed a wiring harness problem. Wiring harness was against manifold causing intermittent shorts. Spent over $2,000 for a $100 fix. But vehicle runs fine now