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1. What phenomena may occur if the air flow meter is broken?
[Pacific Automotive Network] The symptoms of a broken air flow meter are engine blowouts and intermittent shutdowns. If this situation occurs, the vehicles idle speed is normal, acceleration in place is normal, and driving at normal speed is also normal. However, the above fault phenomena may only occur when the speed exceeds 120 kilometers per hour. This fault may be caused by inaccurate signal output of the air flow meter at high speeds. The symptom of a broken air flow meter is that the engine trips and intermittently stalls. If this situation occurs, the vehicles idle speed is normal, acceleration in place is normal, and driving at normal speed is also normal. However, the above fault phenomenon may only occur when the speed exceeds 120 kilometers per hour. This fault may be caused by inaccurate signal output of the air flow meter when it is disturbed at high speeds. The engine stalls at high speed, causing the vehicle to bounce. There are many possible reasons for this, such as reduced fuel injection, ignition system failure, exhaust gas recirculation, the fuel vapor recovery system of Hailyan gasoline, and an incorrect sensor output signal. The malfunction of the air flow meter caused the engine to oscillate and intermittently stall. If this situation occurs, the idle speed of the vehicle is normal, the acceleration in place is normal, and driving at the usual speed is also normal. However, it is possible that the vehicle only experiences the above fault phenomenon when the speed exceeds 120km/h. This fault may be caused by inaccurate signal output of the air flow meter at high speeds. (Image/Text/Photo: Pacific Automotive Network Q&A Beast)
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2. How to determine if the air flow meter is damaged
The main methods to determine if the air flow meter is damaged are as follows: Observe engine performance: Unstable idle speed: When the air flow meter malfunctions, the engines idle speed may become unstable, with intermittent high and low phenomena.
. Poor acceleration: During the acceleration process, if you feel insufficient power and slow acceleration, it may also be a sign of a malfunction in the air flow meter. Backfire in the intake pipe: The phenomenon of backfire in the intake pipe, where unburned mixture burns inside the intake pipe and makes a "popping chamber early" sound, is a typical symptom of damaged air flow meters. Black smoke from exhaust pipe: If the exhaust pipe continues to emit black smoke, it indicates incomplete combustion of the engine, which may be caused by the air flow meters failure to accurately measure the intake air volume. Excessive exhaust emissions: Malfunction of the air flow meter may also lead to excessive exhaust emissions, causing pollution to the environment. Terminal testing: Pull out the terminal: Pull out the terminal of the air flow meter directly, which is a quick method to determine whether the air flow meter is faulty. Observe whether the fault has been eliminated: If the above engine performance problems are significantly improved or eliminated after unplugging the wiring terminals, it can be preliminarily judged that the air flow meter has malfunctioned. If the fault still exists, further inspection is needed to determine the specific fault point. The above methods can help car owners or maintenance personnel to preliminarily determine whether the air flow meter is damaged, so as to replace or repair it
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