Is Liu's scarf still usable?

It still works! 1. Valve clearance is too large. If the valve clearance is too large, resulting in the valve opening too late and the exhaust pipe burning red, it is necessary to loosen the lock nut and adjusting screw of the valve, insert the feeler gauge into the gap between the valve foot and the rocker arm, then turn the adjusting screw, pull the feeler gauge, and tighten the lock nut after adjusting the valve clearance. 2. The valve spring is too soft. If the valve spring is too soft, it will also cause the valve to open too late, the cylinder pressure will decrease, and the exhaust pipe will burn red. It is necessary to replace a new valve spring. 3. The ignition time is too late. The red burning of automobile exhaust pipe may be due to the late ignition time. You must loosen the fixing screw of the distributor, turn the distributor counterclockwise, and then tighten the fixing screw. 4. Too much carbon deposit. The red-hot automobile exhaust pipe may be due to excessive carbon deposition in the exhaust pipe and muffler. It is necessary to remove the exhaust pipe, separate the exhaust pipe from the muffler and remove the muffler core in the muffler. Immerse the exhaust pipe, muffler shell and muffler core in metal cleaning agent, and remove carbon deposit with wire brush. 5. The valve is not closed properly. If the valve is not closed properly, the combustion gas will leak into the exhaust pipe, which will cause the exhaust pipe to heat up, so the valve needs to be replaced. 6. Replace the ignition coil. If the ignition coil fails, individual cylinders can't ignite, the exhaust pipe burns red, and a new ignition coil needs to be replaced. 7. The fuel injector is blocked. If the exhaust pipe of the car burns red, you can check whether the oil nozzle is blocked, and you can clean it or replace it with a new one. 8. The gasoline pump is out of order. If the gasoline pump can't pump oil, it will also cause the exhaust pipe to burn red. It is necessary to replace the new gasoline pump. 9. The oxygen sensor is faulty. If the oxygen sensor is not easy to use, the mixture will be too thick, and the mixture will enter the exhaust pipe, causing the exhaust pipe to burn red. The oxygen sensor needs to be replaced with a new one.