The first four and the last eight 336 EFI tachometers in Ou Man were unstable, and the fire stopped.

This is not a dirty throttle or oil circuit. There are two reasons: 1, and some spark plugs are not good, such as wet carbon deposits and weak sparks. When the rotational speed is low, the ignition start of this cylinder is slower than that of other cylinders. When the speed is high, the voltage is high and it can work. Cold car or first start, this kind of engine start always requires the motor to rotate for a long time. Check the spark plug. 2, individual cylinder valve clearance is too small or dead, the engine is in a slight air leakage state when there is residual heat, and the cylinder pressure is low when the speed is low, making it difficult to start, which becomes the burden of other cylinders. After other cylinders were started, the engine speed increased, so the valve started late because it was too late to leak.