
S90 engine shaking when cold is caused by: 1. Low ignition energy at low engine temperatures; 2. Insufficient temperature inside the engine; 3. Inadequate temperature of both fuel and lubricating oil. Taking the 2021 Volvo S90 as an example, its body dimensions are: length 5090 mm, width 1879 mm, height 1450 mm, wheelbase 3061 mm, and fuel tank capacity 55 liters. The 2021 Volvo S90 is equipped with a 2.0T inline 4-cylinder turbocharged engine, with a maximum horsepower of 250 hp, maximum power of 184 kW, and maximum power speed of 5400 to 5700 rpm.


