Honda Civic engine shakes severely when cold

Q: 2015 Honda Civic, engine shakes severely when cold, gets better when hot, replaced ignition coil, spark plug and injector, used intravenous drip to remove carbon deposits, but all failed to solve the problem. Checked cylinder pressure is normal, mixture is normal, ignition timing is also fine, what other reasons may cause vehicle failure?

A: Vehicles that have been used for 5 years or more, engine shaking failure phenomenon, mostly engine mount rubber aging and cracking. When the engine shakes at idle speed, you can use a dry jack to support the engine mount position. When the vehicle does not shake at a certain position, it can be confirmed that the engine mount is damaged, and the fault can be eliminated by replacing it. The upper right engine mount of Honda Civic engine is the most vulnerable to damage, which can generally be seen by observing the gap with the naked eye. After replacing the parts, the vehicle can return to normal.