What causes severe shaking when a BMW 3 Series is in neutral gear?
1 Answers
Possible causes of car shaking include carbon buildup and fuel supply system malfunctions. Excessive Carbon Buildup: Severe carbon deposits in the engine cylinders can clog spark plugs and valves, directly leading to shaking during idle. If the vehicle exhibits poor acceleration and persistent shaking, an engine cylinder cleaning may be necessary. Fuel Supply System: Fuel system issues causing unstable oil pressure can lead to inconsistent air-fuel mixture concentrations, resulting not only in shaking but also unstable idle. It is advisable to first consider replacing the fuel filter, as prolonged use can lead to clogging. Subsequently, check the oil pressure bypassing the fuel filter; abnormal readings may indicate a fuel pump problem.