At first all seemed to go well. The all-alloy engine offered good performance and economy, but then an issue started to arise
with a crucial part of the engine - the timing chain.
This is one of the most important parts on the engine as it's used to keep all of the cylinder head's inner workings in perfect unison, the moving parts of the blocks internals and results of a failure are catastrophic. read more
Generally speaking, BMW engines are pretty reliable, but if you have an E46 3 Series fitted with an N42 four-cylinder you'd better read more
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Swirl flaps are designed to create swirl or tumble of the air to aid better combustion under light load where soot levels tend to be dominant because of the lack of air, they are also there to help with driveability in low load conditions, they are controlled by a vacuum or solenoid actuator and are closed during light-load operations such as when idling at traffic lights, changing gear and deceleration to maximise combustion efficiency, fuel economy and emissions performance..