For the purchase of second-hand car consumers, most concerned about is the second-hand carengine problem. The engine is the heart of the car, directly related to the car's condition and so on. Today Carol electronic throttle for everyone to introduce how to identify second-hand car engine is good or bad, I hope for your help.

1, ground test when removed the exhaust pipe and air filter.

Reason: if the mixing ratio of improper, incorrect valve clearance and the ignition is not correct, there will be furious phenomena in the carburetor anti spray and exhaust port. Carol electronic solar term door takes note of the judgment, because any possibility, and some just simple adjustment, some of it is to repair. But you've never done it before, if feeling this time the sound of the engine is very strange, then don't mind. That's the way it is.

2, look at the start before the spark plug, there is a number in the heart.

Reason, if the quality of the spark plug is not how you may will earn a return and if you enough level, spark plug is reflect the original status of the engine.

3, fill water in the water tank.

Reasons: some engine cylinder gasket leakage, no water you wouldn't even notice it.

4, let go of all oil, engine cleaning agent after washing with new oil, and do not add any additives.

Reasons: some old engine wear large, channeling oil and sound problems, with refined oil or repair agent increased the viscosity of the oil, the degree of obscures the truth. But this car is not too good in winter.

5, four stroke engine is best to look at the open cylinder head tappet wear on the column.

Reason: the valve tappet cam shaft friction and long term, it can reflect the degree of the oldengine. Cairo electronic door above the solar term more and more old pitting machine. And the cylinder head down easily, will not have any influence on the engine performance. But the bestof this work and remove the motor after.

6, two stroke car to have a look around Is it right? Agile exhaust valve.

Reason: very important influence of the performance of the car.

7, listen to the voice of don't stand on the side, need a screwdriver against the engine to.

The reason: the machine feels uncomfortable. Then, it will tell you, if you don't understand.