What is the reason for the 307 stalling and shaking during cold start?
1 Answers
307 stalling or shaking during cold start is caused by carbon deposits. Extended relevant information is as follows: 1. Carbon deposits usually appear on the inner wall of the throttle valve, the head of the intake valve, the inner wall of the intake manifold, the top of the piston, and the inner wall of the combustion chamber. Excessive carbon deposits on the inner wall of the throttle valve can lead to insufficient air intake, making it difficult to start or causing the engine to stall easily at idle. After the coolant reaches the engine's normal operating temperature, because the throttle opening is larger than the normal idle value, the ECU repeatedly adjusts the position of the throttle valve plate, resulting in fluctuating idle speed. 2. The most prone area for carbon deposits is not just the throttle valve, but also the head of the intake valve (at the end of the intake manifold). In non-direct injection engines, gasoline is injected into the intake space where the intake valve head is located, and the gum, wax, and unburned carbon compounds all deposit in this area. The surface of carbon deposits is relatively loose, similar to a sponge. 3. Insufficient fuel entering the cylinder leads to a lean mixture, making ignition difficult.
