Why is Fox's idle speed unstable ~

This problem is basically caused by carbon deposition in the throttle, and the main reason for carbon deposition in the throttle is that Fox uses an inverted engine. Because you often stop and go in normal cities or shift gears at low speed due to fuel consumption and noise, it is easy to accumulate carbon. I can't help it. This problem was brought out from the womb, so it was designed. Because of fuel economy, road speed limit and urban congestion, most people don't shift gears at high speed, so they have no choice but to spend money regularly to clean up carbon deposits.

The difference between an inverted engine and an ordinary engine is that the intake and exhaust positions are opposite to those of an ordinary engine. Ordinary engines exhaust after the front row of air, while inverted engines exhaust after the front row of air. The intake manifold is arranged on the windward side, which lengthens the length of the intake manifold. The advantage of inverted engine is that the cooling effect of intake manifold is increased, and catalytic converter can be installed near the exhaust head to improve the ability of purifying exhaust gas. Disadvantages are slow intake speed, insufficient pressure, poor engine power in low speed range, and easy to cause carbon deposition (Fox low torque difference, which is the root of engine easy carbon deposition).

My fox has been cleaned several times.