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Yes! For a number of reasons: 1. If one of the cylinders is not 'firing' all the unburnt fuel that was delivered to that cylinder will pass into the exhaust system. From an emissions point of view the vehicle will almost certainly be emitting excessive (illegal) amounts of Hydrocarbons. If the vehicle is relatively modern (1992 onwards) there is a possibility that the catalytic converter (expensive!) may be damaged by the neat fuel entering it. 2. The vehicle's fuel consumption will be very poor. 3. The performance will be very poor. 4. Because only 3 of the 4 cylinders is working, the engine will be unbalanced and excess vibration can lead to other compilations throughout the vehicle - bits dropping off! 5. There is a likely-hood that the engine will overheat which can lead to further complications and expense.

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Q: Is it bad for a motor to only run 3 out of four cylinders?
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