What is the reason for the heavy throttle of the second-hand horse bought by my friend?

According to the production date, it is estimated that your car should be a Ma Lao 6, not an electronic accelerator. Why not open the head cover and pull the throttle by hand to see if it is stuck and smooth? See if the throttle line is deformed or if it has been accidentally hit. If there is nothing wrong with the cable and the throttle feels uncomfortable, it is usually caused by the dirty throttle, which can be solved by cleaning it.

The problem of not returning to the direction is basically related to the crash. First, check the four-wheel alignment to see if the parameters such as camber angle of the left front wheel and caster angle of the kingpin have changed too much. If the parameters change too much, it means that one or part of the left front wheel suspension is deformed. Carefully check all parts of the chassis suspension, find out the deformed parts and replace them (the lower arm and claw are the most easily deformed). Then four-wheel positioning is used to measure the parameters again, and the problem that the direction does not return after the parameters are normal can be basically solved.

The check problem caused by steering gear is relatively small. Check the steering gear for oil leakage? Are the inner and outer ball heads loose? If it is normal, the problem of the steering gear can be basically ruled out. It is expensive to repair or replace the steering gear.

I hope this helps.