After the seeker started, the speed pointer slowly fell back.

After explorer is started, the speed pointer drops slowly, and there may be some potential problems. Some possible reasons and solutions for this situation are as follows:

1. Engine carbon deposit: Long-term low-speed driving or short-distance driving may cause engine carbon deposit, which will affect the normal operation of the engine. It is recommended to clean the engine regularly to remove carbon deposits.

2. Air flowmeter failure: The air flowmeter is used to measure the air flow entering the engine. If the air flow meter fails, the engine may not work normally, resulting in a slow decline of the speed indicator. It is recommended to check whether the connection of the air flow meter is good, and replace the faulty air flow meter if necessary.

3. Oil circuit blockage: Oil circuit blockage may lead to insufficient fuel supply, thus affecting the normal operation of the engine. It is recommended to replace the fuel filter regularly to ensure smooth oil passage.

4. Ignition system failure: Ignition system failure may cause the engine to fail to ignite normally, thus affecting the vehicle speed. It is recommended to check the spark plug, ignition coil and other ignition system components to ensure their normal operation.

5. Throttle failure: The throttle controls the air flow into the engine. If the throttle valve fails, the engine may not work properly. It is recommended to check whether the connection and operation of the throttle valve are normal and replace the faulty throttle valve if necessary.

If the above methods can't solve the problem, it is recommended to contact a professional automobile technician for inspection and maintenance. Please remember that the above are just some possible reasons, and specific problems need to be actually checked to get accurate results.