Map Sensors

As is similar to the oxygen sensors located in your exhaust system, a faulty map sensor will produce poor fuel economy coupled with a rough idle. Poor engine performance may also be noticeable as the air to fuel mix will be lean and causing a lack of power. The check engine light may also become illuminated if the MAP sensor is faulty.

If left over time this increase or decrease in air fuel ratio contributes to incorrect ignition timing. This can lead to issues such as overheating, parts failure or catastrophic engine damage.

When under engine load the manifold absolute pressure map will be providing less or more fuel when you have a faulty sensor. Although in most case these faulty map sensors won't stop you from driving your vehicle you should attend to these as soon as possible to limit the issues listed above.

Sensor faults are best determined using a scan tool and verifying the relevant error code prior to undertaking replacement. As there are a number of sensors in the intake and exhaust system these all work in unison to provide smooth running and fuel economy.

Although these both have their benefits in regards to engine performance it is not unusual for a vehicle manufacturer to utilise both especially in supercharged or turbocharged engines. Manifold absolute pressure sensors are usually mounted on the intake manifold whilst the mass air flow sensor is found directly after the air filter box.

Using a suitable aerosol electrical parts cleaner you can spray this into the sensor port and allow to dry. This may dislodge dirt or buildup to enable the sensor to function properly again. When accurately diagnosed and if unable to be cleaned come into Repco to find the right MAP sensor for your vehicle. With the ability to be changed relatively easily a replacement MAP sensor can regain lost fuel economy and engine performance.