Vehicle specific malfunctions Diagnosis and necessary measures to be taken
Release time:
2021-11-12
1、Can not start
1) Poor compression - perform a compression check and repair the engine if necessary
2) Improper air distribution timing - check air distribution timing and correct if necessary.
3) Faulty ignition - check and repair if necessary.
4) Fuel system, fuel pump, fuel filter, injector drum obstruction, mismatch of injector types used - check fuel pressure and injectors. Fuel contamination.
5) Three yuan catalytic device blockage
6) oil pressure is too high - oil lagging valve or oil pump failure (resulting in the valve can not be closed).
2、Difficulty in starting
1) poor compression - compression check, repair the engine if needed.
(2) air-fuel ratio oil-poor, vacuum leakage, injector drum barrier - check the inlet vacuum leakage, injector.
3) Air-fuel ratio rich oil, fuel injector, input transporter failure - check fuel injector, troubleshooting. Voltage, resistance test on the input transporter.
4) Fuel pressure regulator, fuel pump - check fuel pressure and injectors.
(5) Ignition system failure - use the oscilloscope to check the ignition system.
3、Idle speed speed instability
(1) Compression deterioration - compression check, repair the engine if necessary.
2) Exhaust gas recirculation valve (normally open) - carry out exhaust gas recirculation valve check.
3) Vacuum leak - check intake piping for leaks.
4) Dirty injectors - clean or replace injectors
5) Dirty throttle housing - clean the throttle when necessary.
6) Intake valve is dirty - use combustion chamber cleaner to wash away the dirt on the valve.
4, torque converter lock-up clutch lock-up engine work is not stable
1) spark plug, ignition wire, ignition coil.
2)Fuel injector
3)Vacuum leak
4) exhaust cycle valve
5) Air flow sensor - check sensor and connecting wires, if necessary
6) Fuel pressure bottom - check fuel pressure and fuel pump flow, replace components if necessary.
7) Loose engine mounting bolts -
8) Oxygen turn sensor failure
9) Throttle position sensor - check the sensor and wires, repair or replace if necessary (throttle basic setting).
10) Poor air port compression - check engine compressibility, repair engine if necessary.
11) Fuel contamination - check fuel for water and alcohol, replace if necessary.
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