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In automobile repair standards: in the above ambient temperature -5 ?, each time you use starter 5S, use at most 3 times that the engine should start. With the modern automobile technology content improved, many users of this standard is not recognized, they hope to use the starter in the 5S should start successfully, and the engine of modern general can do. If the engine startup failure, failure generally include: 1.Starting system failure, such as insufficient battery power, starter starter circuit is damaged or defective. 2.Engine mechanical failure, such as intake manifold leak, closed between the piston and the cylinder is bad, and the cylinder valve closed lax cause low pressure. 3.The intake valve and the intake pipe back too much coke, resulting in fuel being injected into the coke can not be adsorbed into the combustion chamber. 4.Engine management system failure, such as speed sensor signal is weak, the water temperature signal is not correct, and that line is bad and so on. 5.Faulty ignition system, such as spark plug gap coke excessive or incorrect voltage leakage, as well as the ignition coil failures. 6.Fuel system fault, such as the fuel system to maintain a low pressure, injector leakage or blockage. When the engine is cold start, if the engine does not appear cold fast idle speed instability or failure, the cause of the malfunction exists generally include: ? engine mechanical failure, such as the cylinder pressure is low. ? intake system failure, such as intake manifold leak and so on. ? intake valve and the intake pipe back too much coke and so on. ? engine management system failure, such as water temperature, intake air temperature signal is not correct, there is a fault line and so on. ? faulty ignition system, such as spark plug gap coke excessive or incorrect, power lines, distributor cap leakage, as well as the ignition coil failures. ? oil system failure, such as fuel injectors caused by excessive internal glial coke injector closed lax or blockage. Although many car manufacturers instructions that after the cold start without preheating can be started, but I think the engine at startup if slightly preheated 3~5min, the engine will be of great value. Because it can reduce the mechanical abrasion of engine, the engine can start the power is sufficient. If after the cold start is revving up there will be a slight break phenomenon break car, if car phenomenon is serious, cause generally lies in:
1.Engine mechanical system failures, such as cylinder engine power due to the low pressure drop, more prominent in the cold state.
2.The intake valve and the intake pipe back too much coke, resulting in fuel being injected into the coke can not be adsorbed into the combustion chamber.
3.Engine management system failure, such as water temperature, intake air temperature signal is not correct, the line failure.
4.Faulty ignition system, such as spark plug gap coke excessive or incorrect, power lines, distributor cap leakage, ignition coil failures.
5.Oil system failure, such as injectors caused by excessive internal glial coke injector closed lax or blockage. Diagnosis of the above 3 fault should follow the first electric machine, the simple one first principle, if the engine is difficult to start, at the same time, there is the idle jitter and hot bad acceleration "three thermal fault" should first rule out. Diagnostic procedures are as follows:
1.Check the engine appearance, check the vacuum tube, wire harness plug off, whether there is leakage, leakage, oil leakage and water leakage phenomenon.
2.Using fault diagnostic trouble codes and data stream query.
3.With a multimeter, oscilloscope and other equipment to measure.
4.Based on the above examination to determine the cause and components for repair or replacement of parts.
5.Troubleshooting again after using the above equipment for testing.
6.Reproduction failure test or road test conditions. Say that buying a car easy, using a car difficult. Here also recommend the useful and hot car tools likeLaunch X431 and MB Star C3 from Vtoolshop.
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