Hard Starting. Similarly, an excessively rich or lean mix makes the engine hard to start.Insufficient fuel injection starves the engine for fuel, leading to rough idling and perhaps even random cylinder misfiring. Excessive fuel generates higher hydrocarbon (HC) and carbon monoxide (CO) emissions, while insufficient fuel may lead to higher nitrogen oxide (NO x) emissions. Failed Emissions Inspection. Because fuel injection doesn’t correspond to engine load, a broken MAP sensor can lead to an increase in harmful emissions.However, if too little fuel is consumed, the engine may lack power for acceleration and passing. On the one hand, fuel consumption will go down, which seems like a good thing. Lack of Power. If the ECM is reading high vacuum, it assumes the engine load is low, so it cuts fuel injection and retards spark timing.This leads to excessive fuel consumption, poor fuel economy, and possibly detonation. Poor Fuel Economy. If the ECM is reading low or no vacuum, it assumes the engine is at high load, so it dumps in more fuel and advances spark timing.So, how will you know that your MAP sensor is going bad? Here are the key problems to look out for: If the MAP sensor goes bad, the ECM can’t accurately calculate engine load, which means the air-fuel ratio will become either too rich (more fuel) or too lean (less fuel).
Sometimes, engine heat “overcooks” the MAP sensor's electronics or cracks vacuum lines. MAP sensors fail by getting clogged, contaminated, or damaged. On the can of MAF cleaner it says dries instantly, but you really should give it at least 10-15 minutes to dry to be safe.MAP sensor problems could trigger a DTC and check engine light.
Take a que tip, and very CAREFULLY clean along the metal piece of the sensor.Īfter you are done give it some time to dry and reinstall. Take the can of MAF cleaner and spray all over the MAF up until the rubber gasket, make sure to not spray on the connector. Next step get some MAF Cleaner from Autozone or PepBoys, you can use other electric cleaners, but why when there is one designed specifically for this. Make sure you let the MAF cool down, or better yet do it on a cold engine, because if you try cleaning it while it is still hot you can fry it. There is a plastic covering that needs to be removed which is just held by clips, be careful removing them as they are easy to break.ĭisconnect MAF by gently pushing on the release, do not apply any force, youll see the release right by the connector.
To remove it there are two torx screws, one on top and one on the bottom. Attached in the photo you will find the MAF (Mass Air Flow Sensor).
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