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Manifold Air Pressure (MAP) Sensor
See Figures 4, 5 and 6
The MAP sensor measures changes in the intake manifold pressure which result from engine load and speed changes, and converts this to a voltage output. MAP is the opposite of what you would read with a vacuum gauge. When manifold pressure is high, vacuum is low. The ECM uses the MAP sensor to control fuel delivery and ignition timing. A failure in this circuit should set a trouble code 34. To test the MAP sensor, have the ignition ON with the engine not running. Check voltage from sensor terminal B to A. It should be within the value specified in the chart. Apply 10 inches of vacuum to the sensor with a vacuum pump. There should be a 1.2-2.3 voltage change. If the sensor did not meet either of these requirements, have the system diagnosed and repaired by a qualified technician.
Fig. 4: MAP sensor location on TBI engines
Fig. 5: MAP sensor values (Non-Turbo)
Fig. 6: MAP sensor values (Turbo)
[Quote]Then Why could i buy a map sencor at a parts store [/QUOTE]
Because sometimes parts people can't read and sometimes parts books are just too general. BotXXXXX XXXXXne is the car isn't equipped with both.
I'll be looking forward to your accept.
That explains the stupid counterman scenerio.
He had a paper route last week.
Wow!, You gotta be kidding. After all this your looking for an IAT?
I've give you one more try. The IAT will be in the intake before the throttle body. Some are right in the snorkal hose and some are in the air filter box. Most have a 2 wire plug and you can usually just pull the sensor out.