First see that whether the hunting is due to an error in tachometer, if there is a accelerating or decelerating sound along with the fluctuating rpm
1. The tachometer or its wire may be out of order. They may be rubbing, or the pin might have turned round and is about to give in. Try lubricating the wire, or changing the tachometer. But if you can hear the hunting by sound do not touch it as it might be working after all.
2.Ingress of air in the fuel in the fuel system.
3. Engine is cold during starting since the right preheating temperature is not maintained.
4. Faulty governor.
5. Some fuel injectors getting stuck and firing intermittently.
1. The tachometer or its wire may be out of order. They may be rubbing, or the pin might have turned round and is about to give in. Try lubricating the wire, or changing the tachometer. But if you can hear the hunting by sound do not touch it as it might be working after all.
2.Ingress of air in the fuel in the fuel system.
3. Engine is cold during starting since the right preheating temperature is not maintained.
4. Faulty governor.
5. Some fuel injectors getting stuck and firing intermittently.
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