What are the methods of overhauling the high voltage circuit failure of automobile ignition system?

The ignition system of an automobile, which consists of the battery, generator, distributor, ignition coil and spark plug, etc., can provide enough voltage at the right time so that the spark plug can produce enough sparks to ignite the mixture in the cylinder, so that the engine can get the best combustion efficiency. It can be said that the ignition system of the car plays an irreplaceable role in the use of the car. Then this article mainly lead you to understand the car ignition system common faults and repair methods and how to maintain the ignition system of the car, the specific follow small make up to understand.

Common fault diagnosis of automobile ignition system

I, how to adjust the ignition timing of the traditional ignition system?

No timing light adjustment method

① First of all, the distributor contact gap will be adjusted to the right as required.

② Find the 1st cylinder compression upper stop position. Remove the high pressure distributor wire of the 1st cylinder. Remove the 1st cylinder spark plug with the spark plug socket, plug the spark plug hole with your thumb or a cloth ball, and then crank the engine crankshaft. When you feel resistance in the cylinder, slowly crank the crankshaft, while observing, so that the timing marks are correct.

③ After the above parts have met the requirements, turn on the ignition switch, loosen the distributor shell fixing screws, rotate the distributor shell to make the breakers contacts closed. Then the distributor and then reverse rotation, to the distributor contacts just open, this moment can be seen between the contacts to produce a tiny spark, and then tighten the distributor shell set screws, and will be adjusted to the octane value of the scale for the position of zero; at this time, the direction pointed by the parting of the fire head that is the position of the 1 cylinder.

④ Insert the high-voltage wires on the distributor cover according to the ignition sequence, and tighten the screws by hand to fix the distributor temporarily.

⑤ Start the engine to check the ignition timing, if the engine ignition system and fuel supply system is well adjusted at this time, the engine exhaust should drip, engine vibration is minimized and the noise is minimized.

Timing light adjustment method

① Start the engine to warm up to normal operating temperature.

② Ignition timing light 2 black clamps were connected to the battery positive and negative stakes, the sensor clamped on the first cylinder high-pressure wire.

③ Adjust the engine speed to normal idle state, using the ignition timing light on the timing pulley to see whether the pulley mark for the manufacturer's regulations on the angle (generally 6 ° ~ 10 °).

④ If you need to adjust, loosen the distributor screw, use the ignition timing to align the timing pulley and then rotate the distributor (left and right) until the scale mark in the specified value, and finally lock the distributor screw can be.

Two, spark plugs in the use of common failures?

Spark plug serious erosion

Spark plug top scarring, destruction or electrode melting, erosion indicate that the spark plug has been destroyed, should be replaced. Replacement should check the signs of ablation and color changes, in order to analyze the causes of failure.

① The electrode is melted and the insulator is white. Indicates that the temperature in the combustion chamber is too high, which may be too much carbon in the combustion chamber, so that the valve gap is too small, such as caused by the exhaust valve overheating or cooling device is not working well, it may also be the spark plug is not in accordance with the specified torque tightening.

② electrode rounded and insulator scar. Indicates that the engine premature combustion, may be too early ignition time or low octane gasoline, spark plug thermal value is too high.

3 Insulator tip fracture. Burst combustion is the main cause of insulator rupture. And premature ignition, low octane of gasoline, and high temperature inside the combustion chamber may cause the engine to burst combustion.

④ There is a gray-black stripe on the top of the insulator. This stripe signifies that the spark plug has leaked and should be replaced with a new piece.

Spark plug deposits

Spark plug insulator tip and electrodes are sometimes sticky deposits, serious engine failure, such as cleaning the spark plug can be temporarily remedied. In order to maintain good performance, it is necessary to identify the root cause of the problem.

① Oily deposits. Oily deposits on the spark plug indicate that lubricant is entering the combustion chamber. If there are only individual spark plugs, the valve stem oil seal may be damaged. If the cylinder spark plugs are sticky with such deposits, indicating that the cylinder oil, you should check the air filter and venting device is blocked.

② black deposits. Spark plug electrode and internal black deposits, indicating that the mixture is too thick, you can increase the engine running speed, and continued for a few minutes, you can burn off a layer of black soot left on the electrode.

Three, how to repair the ignition system low voltage circuit failure?

① Press the horn, turn on the headlights are also bright. With a screwdriver or wire in the ignition coil "-" terminal test fire, such as no fire, the ignition coil low-voltage terminal to the ammeter between the circuit breaker.

Press the ignition coil "switch" → ignition coil "switch - power" terminal → ignition switch → ammeter order test fire, according to the fire and no fire to diagnose the part of the fault circuit breaker. If the terminal and wire connection is not secure or poor contact, you should clean the terminal, tighten the fixing nut; if a section of the wire is broken, replace the section of the wire, the replacement wire should be the same as the original wire specifications.

② Press the horn does not sound, open the headlights do not light. With a wire in the starter motor terminal test fire, if there is a fire, the failure of the starter motor terminal to the ammeter line between the circuit breakers; if there is no fire, the failure of the battery is insufficient power or its line failure. Insufficient battery power, should be charged; line break, should be reconnected.

③ With a screwdriver in the ignition coil "-" terminals on the fire, such as fire, and then in the distributor activities between the contact arm and the base plate fire test. If there is a fire, it is a contact failure (such as contact erosion, too dirty, can not be closed, etc.), can be used to "platinum sanding" grinding contacts and adjust the contact gap and other methods to eliminate the problem; such as no fire, go to the next step.

④ In the distributor insulation post and the distributor shell at the test fire, such as no fire, the distributor insulation post to the ignition coil "-" post between the wire break fault; if there is a fire, the insulated bracket to the insulation post between the wire break fault.

If the system is poor contact between the terminal and the wire and power failure, should be cleaned and tightened terminal and wire head; if a section of the wire breaks, with the same specifications for the replacement of the section of the wire can be.

Four, how to repair the ignition system high-voltage circuit failure?

① Remove the high-voltage wire in the middle of the cover of the distributor plate, insert a screwdriver into the high-voltage wire poles, holding a wooden handle or rubber handle, with a screwdriver metal pole body to approach the engine's iron bulge, and then start the motor to see if there is a spark flash jump. When starting the motor, if you find a spark flash and strong, then you can prove that the ignition system high-voltage circuit at least to the distributor disk are good between.

② If the spark is strong, but the engine can not start, it should be attributed to the spark plug problem or ignition timing is not right. At this time, you can take turns to remove the spark plugs of each cylinder, in order to check.

③ If there is no spark jumping, or a dark red star flash, then replace the spark plug, or wipe it clean to solve the problem.

④ If there is a multimeter, you can clip the two ends of the high-voltage cable, measure the resistance, such as found more than 2.5 × 104Ω, the cable will have to change.

⑤ If the high-voltage cable test is not a problem, then there is no spark jumped out of the problem in the split-head and the splitter plate cover, to check the two parts are not damaged, cracked, leakage and other phenomena. If so, they will be repaired or updated.

Fifth, high-pressure jump fire weak is caused by what reasons? How to rule out?

Engine in high, medium and low speeds, the muffler issued a rhythmic "burst" sound, and even cannon, intake manifold sometimes backfire; the engine is easy to stall, it is not easy to start, which indicates that the high pressure produces a weak spark.

The reason for this failure

① Disconnector contact erosion.

② Capacitor internal poor contact or bad lap.

③ Ignition low voltage coil turn-to-turn short circuit.

Troubleshooting

First of all, remove the high-voltage ignition cable, about 5mm from the spark plug, to see the jumping fire. If the spark jump distance is short and thin, the sound is small and red, and sometimes there is a fire phenomenon, that is, high-pressure spark weak fault. Check the fire, should pay attention to the high-pressure spark line and spark plug distance must be from far and near or from near and far to compare, to prevent because of the distance caused by not jumping the fire or because of the distance near the fire jumping weak, and cause misjudgment.

If the center of the high-voltage wire fire is weak, not the blue thicker fire, but the yellow thinner fire, you should remove the capacitor and try again. After removing the capacitor, the spark is unchanged, the fault is in the capacitor; after removing the capacitor, the spark is weaker, the fault is in the ignition coil. Then repair or replace the capacitor or ignition coil according to the specific fault.