The manifold absolute pressure, or MAP sensor measures the pressure inside the intake manifold. It is one of many parameters used by the engine control module to dictate fuel delivery rated based on the current operating conditions. A faulty MAP sensor can therefore have a significant impact on engine performance and fuel economy.
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• Disconnect both negative battery cables.
• Locate the MAP sensor on the upper intake plenum to the passenger side of the alternator.
• Disconnect the electrical connector from the MAP sensor. We also recommend unplugging the electrical connector above the MAP sensor in order to obtain clear access to the retainer bolt.
• Remove the MAP sensor retainer bolt with a 10 mm socket.
• Carefully remove the MAP sensor from the intake plenum. Rotating the sensor body left to right will help it come out easily without breaking the plastic tip off.
• Clean the mounting surface of any debris and ensure that the MAP sensor seal did not leave remnants in, on, or around the intake plenum. Any debris that enters this hole will end up inside the cylinders of the engine.
• Remove the retaining bracket from the old MAP sensor and install it on the replacement (slides off and on).
• Lightly lubricate the MAP sensor gasket with clean engine oil.
• Install the new MAP sensor, once again rotating it left-to-right while inserting into the hole in the intake plenum.
• Once the MAP sensor is fully seated, install the retaining bolt and snug down; do not overtighten as the aluminum threads in the intake manifold are soft and easy to strip.
• Reconnect the electrical connector(s), negative battery cables, and check for proper operation.
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Last update: 12/6/2021
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Disclaimer(s): Vehicle diagnostic and repair procedures may place participants in a situation that poses severe risk of injury; always adhere to proper safety guidelines, ensure any applicable safeguards are in place, and wear appropriate PPE when working on or around a vehicle.
Source(s): ACDelco parts catalog, www.acdelco.com