What is the cause of engine jitter when starting automatically?

1. Oil path problem: The postal path problem is generally that the oil path is blocked, resulting in poor oil supply, which is characterized by engine jitter, unstable waiting speed and flameout during driving; In addition, the engine will shake when the oil pump fails. Judge the problem of the oil pump, disconnect the oil pipe, and check the related flow and flow.

2. Circuit problem: Check whether the positive fit is accurate. Generally, abnormal ignition is a positive matching problem; Check whether the spark plug is aging, whether the gap is the same and whether the gap changes; In addition, the abnormal operation of the distributor will also cause engine jitter.

3. Mechanical reasons: check whether there is abnormal noise in the engine running state and whether there is abnormal noise in the valve; Check whether the working condition of the belt is loose.