What are the symptoms of a faulty ignition coil in a Ford Focus?

1 Answers
DelCorey
07/29/25 10:33pm
Ford Focus ignition coil failure symptoms are as follows: 1. At idle, the vehicle body shakes noticeably. Observe the exhaust pipe outlet - the exhaust gas flow shows obvious intermittency, with severe exhaust pipe vibration and clearly audible "popping" sounds; 2. During driving, when the RPM is below 2500, the vehicle body shakes significantly with poor acceleration; the shaking disappears when RPM exceeds 2500; 3. When opening the engine hood and observing the running engine, noticeable engine vibration is apparent. This vibration significantly exceeds normal engine operation vibration levels, with much larger amplitude.
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