Why does my Mercedes-Benz E-Class experience misfires and rough idling due to faulty ignition coils in Pakistan?

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Why does my Mercedes-Benz E-Class experience misfires and rough idling due to faulty ignition coils in Pakistan?

Many E-Class owners in Pakistan report rough idling, engine misfires, and loss of power, especially in older models like W211 and W212. Could faulty o r failing ignition coils be the cause? How do harsh weather conditions, poor fuel quality, and irregular maintenance in Pakistan contribute to ignition coil failures?

Talha Kyanii asked on 11 Oct 2025 13:03:27 pm

1 Answer

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Gari Master - on 11 Oct 2025 13:04:34 pm

Faulty ignition coils are a frequent cause of engine misfires and rough idling in Mercedes-Benz E-Class models, especially the W211 and W212. In Pakistan, several factors accelerate ignition coil failure:

Poor fuel quality: Low-octane o r contaminated petrol causes incomplete combustion, putting extra strain on ignition coils.

Harsh climate: High temperatures and dust in cities like Karachi and Lahore can damage ignition coils’ insulation and connectors.

Irregular maintenance: Skipping routine spark plug and coil inspections leads to coil degradation.

Electrical issues: Corrosion on wiring o r connectors due to humidity can cause intermittent coil failures.

When ignition coils fail, the spark delivered to one o r more cylinders weakens o r cuts out, causing rough running, misfires, reduced power, and increased fuel consumption.