When to Call the Saab 900 Air Mass Meter a Dud
An air mass meter, commonly known as mass air flow sensor or MAF for short, is used to find out the rate ofair flowentering the combustion chamber of afuel-injected engine. The information procured by this component is necessary for theengine control unit(ECU), the engines onboard computer, to balance and deliver the correct fuel flow to the engine. Therefore, the air/fuel mixture ratio is always at the optimum. Now, the air mass meter could go wrong at any time and this will mess up the process inside the engine. Here are some common signs that indicate a defective air mass meter.
Check engine indicator lights up
Like most defective sensors found inside the engine, they communicate with the ECU to actuate various processes. Once there's something wrong with them, they send a signal also to the ECU and it reflects as a lit check engine light on the dashboard. This is the most reliable symptom of a failing or failed air mass meter. However, since a lot of other parts can set this illumination off, further test should be taken into consideration.
Error codes from scanner
With the car getting more and more technologically savvy, even specific part failures can be detected and diagnosed within minutes with accuracy. An auto diagnostics scanner that's found in most car shops or mechanics near you can do this. Since computer communicates through codes and numbers, any code, number, or message pertaining to a bad air mass meter in your car must be translated properly using the code interpreter found in the owner's manual. The only downside to this one is it comes with a fee. However, if you have invested a diagnostic scanner yourself, then taking a look at what's wrong in your air mass meter is easy. If the scanner codes refer to a malfunctioning air mass meter, you will need to have it inspected right away.
Because the air mass meter is an integral instrument behind the correct balance of air and fuel inside the engine, its failure can cause a range of engine performance problems. These may include low fuel efficiency and dropped gas mileage, stalling, misfiring, knocking or pinging. These are common indicators of failure in automobile parts and are not exclusive specifically to air mass meter failure. Although, these symptoms can appear before the air mass meter fails and the check-engine light will register a problem.