The ignition system does not work reason for failure analysis

Premature ignition time ( 1) Fault phenomenon: idle running is not smooth, easy to remove from heat; Sound speed, the engine has serious deflagration. ( 2) Failure analysis: the failure is mainly ignition timing adjustment assembly misalignment caused by misalignment or ignition Angle. ( 3) Method: even good ignition tester, adjust ignition advance Angle to the specified value. Ignition too late ( 1) Fault phenomenon: heavy muffler noise, urgent to accelerate the carburetor tempering, engine coolant temperature is higher, the car. ( 2) Fault analysis and diagnosis: ignition Angle is not correct. ( 3) Method: adjust ignition Angle to the specified value.