1 fault classification
Ignition system failure according to its location in the ignition system can be divided into two situations: low-voltage circuit failure and high voltage circuit failure.
(1) common faults of low-voltage circuit:
Baotou beiben accessories to keep the battery shortage; line connection is bad or disorder; the battery of poor ground; distributor or sensor failure; the ignition switch is damaged or poor wiring; transistor ignition control unit damage or poor wiring. Low voltage circuit fault diagnosis methods mostly use ammeter or voltmeter by line check to eliminate fault points.
(2) common faults in high voltage circuits:
High voltage line loss or leakage; the distributor cap the distributor rotor rupture breakdown; rupture ablation breakdown; spark plug electrode gap is too large or too small; too much damage to the spark plug fouling; spark plug insulator; the ignition coil is damaged or wiring off.
Most of the high voltage circuit fault using high-pressure fire test method, will be divided into high-voltage electrical center or a cylinder of high pressure line pull off, will be placed at the distance of 3-6mm cylinder head, engine test fire, spark and spark ignition system shows strong, normal work.
2 ignition system does not work
1 fault phenomenon: open ignition switch, start engine, engine no reaction; high pressure test fire, high voltage wire without sparks.
2) fault analysis and diagnosis
3 the ignition time is too early
(1) fault phenomenon: idle running smooth, easy flameout; acceleration, serious engine knocking sound.
(2) fault analysis: the fault is mainly caused by ignition timing adjustment misalignment or ignition angle assembly misalignment.
(3) eliminate the method: even good ignition tester, adjust the ignition advance angle to the specified value.
4 ignition too late
1) fault phenomenon: Baotou beiben heavy sound accessories silencer and speeding up carburetor, engine coolant temperature is high, the car is unable to.
2) fault analysis and diagnosis: incorrect ignition angle.
3) exclude method: adjust ignition angle to specified value.
5 spark plug fault
The fault is mainly as follows: spark plug, oil coke and overheating phenomenon
Spark plug insulator: Coke end, spark plug electrode and the shell is often covered with a layer of very thick dark gray powder soft fouling.
Spark plug oil pollution: failure phenomenon: insulator end, electrode and spark plug shell cover a layer of oil.
Spark plug overheating: center electrode melting, loose, soft top insulator, insulator end most gray crust.
The 6 engine backfire and shooting
If both have started shooting sound tempering, and very serious, it is divided into cylinder high pressure caused by the wrong line. If the phenomenon is not serious, but intermittent occurrence, as if there are rules, there are cracks in the distributor cap, so that inter cylinder channeling caused by fire. The ignition advance angle deviate from the correct position is excessive, will cause the tempering or exhaust pipe blasting.
7 Baotou beiben accessories, engine knock and overheating
The engine is most prone to knock when the load is medium speed. When the fuel grade is correct, the knock phenomenon is caused by the excessive ignition advance angle.
In the case of detonation, the engine will rapidly warming. On the other hand, ignition advance angle is too backward, ignition is too late, engine temperature will be high. In the absence of detonation, the water temperature is too high is not caused by the ignition system, but if accompanied by engine weakness, acceleration insensitive, should check whether the ignition advance angle is too small.