Where would a map sensor be located on a 1999 Chevrolet Malibu?

It depends on the engine size. Most are located on the intake manifold.

CUSTOMER CARE A: The MAP sensor(BWD MAP Sensor - Part No. EC1687) is located on the firewall. You can find it by looking at the intake manifold and following the vacuum lines that come out of it to a black cigarette-box or smaller sized sensor.

The Manifold Absolute Pressure(MAP) sensor measures the air pressure inside the intake manifold vs. the atmospheric air pressure to maintain an optimum fuel-air mixture. Unplug the electrical connector from the MAP sensor and turn the ignition key on, but do not start the engine. With a voltmeter, measure the reference voltage by touching the reference wire with the meter’s positive lead and the negative lead to ground-black wire, which is at the connector’s end coming from the computer.

If the reference voltage--about 5 volts--is out of specification, you have found the source of the problem. Reconnect the MAP sensor and turn off the ignition key.

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