The BMW N47 is an inline 4-cylinder engine, which is a successor to BMW M47. You can have either the 1.6liter or 2.0liter variant with a horsepower of 94hp and 204hp respectively. Since this is a modern engine, it complies with the strict emission standards based on the DPF and EGR technology. This is the reason the engine has a few problems. Give below is a description of some minor and major problems that you may have with this engine.
Premature Failure of the Timing Chain
In this engine, the timing chain faces excessive wear and tear, which results in premature breakdowns. Also, the chain may collapse while you are driving the car, which may cause serious damage to the car. In this case, you may have to replace the engine.
A common sign of a failing timing chain is the rattling noise from the engine backside. You can find this chain between the transmission and the engine. So, changing the chain is the only solution, which requires either taking out the whole engine or detaching the transmission.
EGR Sensor Malfunction
The purpose of the EGR system is to help the vehicle fulfill strict emissions. Basically, this system circulates part of the exhaust gases into the engine intake for the purpose of reducing the amount of nitrogen oxide.
Generally, this system malfunctions when the sensor accumulates a lot of moot. As a result, an increasing amount of exhaust air goes into the intake. Therefore, the hot exhaust gases may melt down the plastic manifold. As a result, you experience a considerable reduction in boost pressure.
If the EGR valve is wide open, it may cause the buildup of soot on several engine components, such as the glow plugs, the intake manifold, and fuel injectors. Therefore, the airflow is reduced because of the restrictions. Therefore, your car takes a while to start in winter.
DPF Not Working
The function of DPF is to filter out diesel or soot particulate matter. Generally, it works under high temperatures. Moreover, during short journeys, this component does not get out enough in order to remove exhaust gases and soot. As a result, it causes the accumulation of soot on several parts, such as engine glow plugs, EGR sensor, DPF sensor and turbo.
Power Steering Pump Failure
On these engines, the power steering is not that reliable. If you find oil spills around the steering oil or reservoir cap, chances are that your power steering pump is going to fail.
Oil Leakage from crankcase breather hose in High Temperatures
Generally, the crankcase breather hose tends to leak out under high temperatures. A common indicator of this problem is the leakage of oil from the end of the hose. However, you can resolve this problem by installing a stiffer plastic hose instead of a rubber one.
In short, if you are the owner of a BMW N47 and you are facing these issues, we suggest that you take your vehicle to a mechanic immediately and have these problems resolved. By reading this article, you can have a better idea of these issues. This will help you take better care of your vehicle.