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Dear Motor Medics, I’m having trouble with my 2004 Ford F150 missing again.
The vehicle shakes when I am at a stop sign and sometimes when I accelerate going up a hill. The check engine light comes on and sometimes flashes as well.
I have had two ignition coils replaced over the past year and they’re expensive! Could it be another one?
I’d like your advice and thoughts on this truck. I really appreciate all your help guys.
Mark in Branson, Missouri
Dear Mark, The Ford F150 and most modern vehicles use what’s called coil-on-plug ignition which in simple terms means that the ignition coil is placed directly above the spark plugs and connected by a short rubber boot instead of using a plug wire.
Using multiple coils allows the ignition system to work more efficiently when it is working correctly and eliminates spark plugs wires. When they fail they give the symptom you describe and cause poor mileage and rough running and possible power train and exhaust system damage.
We often see all ignition coils fail within a short period of time to each other due to age and miles, so be prepared to replace the other six coils.
Due to the labor cost of working on them we often recommend replacing all at the same time to save labor costs even though the coils are not cheap. In the long run it will save a lot of cash over repeat labor repair costs. Take care, The Motor Medics
For entertainment only. Always consult your local shop and follow all safety procedures before repairs.
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