Yes, a 4-cylinder engine with one faulty cylinder will run, but with significantly reduced power and unbalanced operation, which is particularly noticeable in UAE conditions. For instance, a common 4-cylinder GCC-spec model like the 2023 Toyota Camry 2.5L, if running on 3 cylinders, could see power drop from around 203 hp to roughly 150-160 hp. This directly impacts daily driving on busy routes like Sheikh Zayed Road, where merging and overtaking become difficult. Expect a 40-50% increase in fuel consumption, which is a critical cost factor given UAE fuel prices. For the Camry, normal Special 95 fuel economy of around 15 km/l could drop to approximately 10 km/l or less. The engine will vibrate excessively, especially at idle with the air conditioning on high during summer.
A common cause here is a failed ignition coil, a frequent issue in our high-temperature climate that cracks coil casings. The engine control unit (ECU) will detect the misfire and trigger the check engine light. If ignored, this can damage the catalytic converter—a very expensive repair. Based on common garage estimates in Dubai, the total cost of ownership (TCO) impact over one year for such a neglected fault in a Camry could be substantial: immediate repair (ignition coil & spark plug) might cost 400-600 AED, but a damaged catalytic converter replacement can exceed 4,000 AED. Furthermore, the increased fuel consumption (e.g., an extra 5 liters per 100 km) at a fuel price of ~3.20 AED/liter for Special 95 adds significant running costs. Annual depreciation also accelerates as the car's condition deteriorates, making it harder to sell. The MOI UAE vehicle inspection during renewal will likely fail a car with a persistent misfire due to high hydrocarbon (HC) emissions. The UAE Ministry of Energy and Infrastructure's data on vehicle efficiency underscores how mechanical faults directly counteract national goals for reduced fuel consumption.
