Spark plug inspection and problem determination

The last time we introduced theSpark plug of the function, material and types ofToday, let’s briefly look at some of the problems occur spark plug. When you’re cold, or whether in the car has been running after the launch when you start the engine in the difficult and sometimes more to launch a number of times the engine will start, and after launching idle instability, will jitter, speed up the flow, and feel horsepower smaller, frequent stalling at idle when the phenomenon, or the fuel consumption increases, these are likely to be the spark plug out some problems in this institution.

Have time, then turn the owner’s manual you will find original time is set to replace the spark plug and some 20000 ~ 30000, some 40000 ~ 5 million km, during this time you will be back to do maintenance of original , so if you have the habit of their own DIY or go to the maintenance factory for maintenance, it can remove the spark plug their own or ask technician check the following, we will use pictures to explain some problems that look like spark plug, have the opportunity to It can learn to see, for this can be avoided by some unscrupulous operators who cheated.

The above is to use a normal spark plug after the appearance of electrode position in the normal state should be a light gray, light brown or white.

Eat oil, electrode site and the surrounding humid and oil stains, it is likely to be the cylinder and piston ring wear, or valve guides wear, so that caused by engine oil entering the combustion chamber.

Spark plug gap a serious coke, if we find the phenomenon of Mars塞have a lot of coke may be used colder spark plug, spark plug where the temperature is too low than the trading capacity of coke produced. Is also possible that the fuel mixture too thick, or the ignition spark not strong enough.

The central electrode wear and tear, part of the spark plug electrodes will be used for a long time wear and tear, leaving gap increases, the best new ones at this time of the spark plug.

The central electrode and ground electrode bending, which may be wrong size spark plug is too long or too deeply lock spark plug combustion chamber, or combustion chamber with screws, etc. caused by foreign body.

Insulator damage, this phenomenon may be caused by excessive abnormal combustion. This is the octane level of fuel, ignition timing and spark plug’s heat range has a like relationship.

Grounding electrode melting destroyed, and for this reason could be the temperature is too high, spark plug heat value is too low, ignition timing advance, or before ignition combustion phenomenon.

If you are dismantling their own DIY spark plug, then please note if you want to install back to the cylinder when the spark plug, be sure to note is there right now, do not install the spark plug so as to avoid distortion of the lock is broken, as well as please with the Hand to not turn up, if the resistance could not be found soon, there is no right turn is available now, please reload once again demolished by hand using special tools and then locking lock. If no positive or locking spark plug will cause combustion gas leakage can not be normal, which will lead to the engine speed up the weak. Is usually in the demolition of spark plug should pay attention to the following points: 1. If there is silicon wire, be sure to seize the demolition of silicon-wire plug head, not pull wires so as not to pull off. 2. Do not mistake the order of spark plug wires of silicon, it is best to use legislation to write white mark. 3. Install spark plug when the manual switch must first bear in their hands right now, the re-use tool to lock. 4. Install spark plug when you have a fixed locking torque can not be too loose or too tight, generally about 150 ~ 200 in-lbs between. The above considerations are important, must be particularly careful attention.

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