Symptom:Golden cupWhen the station wagon is acceleratingengineshake. Troubleshooting: the vehicle is equipped with electronic single point injectionengine。According to the analysis of fault phenomenon, air is the cause of the above faultFilterSerious blockage;Insufficient fuel pressure: fuel injection nozzle is blocked;ignition systemFault;sensorFault and control module fault, etc.
The carmeterThere is no fault display device on the board. At present, there is no necessary maintenance information, so we can only start with oil and circuit inspection.First put fourspark plugDismantle it and find thatspark plugIt is black, the electrode is covered with carbon deposit, and the electrode gap is too large.Then measure the resistance of each high-voltage line, and the results show that the resistance values of all high-voltage lines are qualified (less than 15K Ω).The impression after inspection is that the ignition efficiency of the car is poor, and the mixture is too rich.
Then the throttle body was removed from the air inlet, and a layer of carbon deposit was found in its cavity.usecarburetorThe cleaning agent will clean the inside and outside of the throttle body, and remove the fuel injection nozzle and idle motor on the throttle body for cleaning.Automobile maintenance network
Then check the connecting intake manifold pressuresensorThe vacuum output pipe (on the air intake chamber) of the vacuum output pipe has been blocked by carbon deposit.It is found that the cause of this fault is basically clear.As the vacuum output pipe is blocked, the intake manifold pressure sensor cannot receive the vacuum change signal from the intake port, nor can it output the corresponding electrical signal. The electronic control module cannot receive the electrical signal from the intake manifold pressure sensor, so it has to start the standby program to maintain the engine runningignition systemThere was also a fault, which caused the engine performance to decline significantly.
Use a steel drill to dredge the vacuum output pipe, and usecarburetorClean with detergent.Replace a new rubber hose to connect the vacuum output pipe on the intake cavity with the intake manifold pressure sensor, and take four new spark plugs and install them on the engine.Then start the engine. At this time, the engine runs smoothly at idle speed, accelerates vigorously, and all faults are eliminated.
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