Symptom: a Shanghai Buick sedan (fitted with electronically controlled V6 engine), when traveling always underpowered and poor acceleration. Check the engine and found serious shake when idling, the intake manifold has tempered the phenomenon hard acceleration.
Troubleshooting: First, clean the air filter, spark plugs and fuel filter replacement, but the fault obd2 code scanner remains. And the use of cleaner fuel injection system, with special equipment delivered to the intake manifold, when starting the engine, to the point of self-cleaning spray device, but did not work, remove the injector, using special equipment cleaning effect is not obvious. Then remove the air cleaner, hand to block the air intake throttle valve to reduce the filter inlet area of the main channel, the mixed gas concentration, the result becomes stable idling, acceleration no tempering, indicating that the fault direct cause is too lean mixture. So to test the fuel pressure, the fuel pressure gauge connected with a tee fitting the fuel pressure regulator and fuel injectors oil on the road between, start the engine and change the speed, the measured pressure values within the normal range. Later, they consider air flow mb star software sensor is an important factor affecting air-fuel ratio, they unplug the test. After unplug able to stabilize the engine idling, acceleration is also improved. Then remove it from the throttle body air flow sensor checks hotline is not broken, but there is fouling the hotline. Use spray cleaner directly after cleaning refitted test, troubleshooting.
Analysis of the causes, since long-term driving the car, did not carry out maintenance on the air flow sensor dust removal, resulting in the failure.
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