So what are mass air meter systems?

An air mass meter is used in a vehicle engine to measure the air that flows into the engine to make sure the correct amount of fuel is being injected into the engine to keep it running smoothly.

It consists of a plastic tube with sensors inside that the air passes through. It also has a plug with electrical wires attached to it. There are two types, the vane meter sensor and the hot wire sensor.

  • With a vane meter sensor, a vane sits in the intake air stream on a spring loaded arm and moves in the proportion to the airflow. A voltage is generated based on the distance the vane moves. This type measures air volume but not mass. It relies on information from other sensors to calculate air mass correctly.
  • The hot wire sensor works by heating a wire in the intake air stream, as air passes past the wire it cools and the change in temperature is used to measure the air flow, this solution can also measure the density (mass) of air.

So how do mass air meters work?

This product is used to check the amount of air going into a running engine. The mass air flow sensors all work together with the oxygen sensor and also the engine control system to maximize the cars performance.

So with the vehicle’s mass air flow sensor, it delivers a signal to the power control module telling the amount of air coming in, this is then compared with oxygen levels in the exhaust to decide the use of the engine.

However, it can be tricky to detect a problem when the mass air flow sensor fails, as the check engine light or engine symbol will probably not be “lit up”.

When there is a problem it is more likely that your car will become less easy to drive and it will feel like it is losing power, for example struggling to get up hills. If this is the case then it usually means replacing with a new part.

At Lynx we hold an extensive stock of both airflow and airmass meters, so please contact us if you feel there may be a problem.