Is it normal for the BMW 7 Series engine to shake a few times when starting?
2 Answers
It is normal for the BMW 7 Series engine to shake a few times when starting, but if the shaking persists, it is abnormal and the cause should be identified and resolved in a timely manner. Taking the 2017 BMW 7 Series as an example, it belongs to the large car category with the following dimensions: length 5250mm, width 1902mm, height 1498mm, wheelbase 3210mm, fuel tank capacity 46l, trunk capacity 420l, and curb weight 2190kg. The 2017 BMW 7 Series is equipped with a 2.0t turbocharged engine, delivering a maximum horsepower of 258ps, maximum power of 190kw, maximum torque of 400nm, paired with an 8-speed automatic transmission.
Having worked at a BMW 4S dealership for many years, I've encountered numerous 7 Series owners inquiring about engine shaking during startup. In fact, slight shaking during cold starts is quite common, especially in low temperatures. This occurs because the thicker engine oil requires time to build pressure, during which the ECU controls additional fuel injection to raise RPM, causing brief vibrations. It's generally fine if the RPM normalizes within ten seconds. However, if accompanied by metallic clanking sounds or dashboard warning lights, immediate attention is needed. Last week, a 740Li owner discovered aged engine mounts during maintenance, causing noticeable vibrations transmitted to the chassis. For such luxury vehicles, I recommend biennial inspections of ignition systems and suspension support components, as severe shaking may impact air suspension and transmission longevity.
