What causes the shaking during cold start of the Magotan?
2 Answers
The reasons for the shaking during cold start of the Magotan: 1. Low ignition energy; 2. Carbon deposits on the valves and intake ports; 3. Inappropriate air-fuel mixture ratio. A simple method to deal with carbon deposits on the valves and intake ports is to drive the car on the highway at high speed, with the purpose of increasing the engine's air intake and gasoline flow. The Magotan is derived from the FutureB6, which is closely related to the Passat B6, and it is also the first B-class sedan produced and sold by FAW-Volkswagen since its establishment. In terms of body size, the Magotan has a length, width, and height of 4865 mm, 1820 mm, and 1475 mm respectively, with a wheelbase of 2812 mm.
When I drove the Passat before, I also frequently experienced shaking during cold starts. The car felt like it was rocking violently, mainly due to incomplete combustion in the engine when the temperature was too low. In cold conditions, the oil film becomes thicker, gasoline atomization is poor, and the air-fuel mixture becomes uneven, leading to unstable combustion and shaking. The most common issue is spark plug carbon buildup or aging, causing misfires. After I replaced the spark plugs once, the problem improved. Another reason could be a dirty throttle body restricting air intake, leading to unstable idle. Clogged fuel injectors causing poor fuel supply is also a factor. I recommend first checking the oil and coolant levels as a simple self-inspection, and using high-quality oil during regular maintenance to reduce friction. If the shaking persists, take it to a 4S店 to clean the throttle body and fuel injectors, and replace the air filter—this should solve 90% of the issues. Don’t delay too long, as prolonged shaking can affect engine lifespan and increase fuel consumption.
