Question about Cars & Trucks
On the firewall with a vacumn pipe running to it ,well it is on older europeon cars
Posted on Nov 29, 2012
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Posted on Jan 02, 2017
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Aug 20, 2017 | Oldsmobile Cars & Trucks
May 01, 2011 | Oldsmobile Cutlass Supreme Cars & Trucks
Hi at the end of your air cleaner tube is a square box with 4 screws and a plug in it. This is your map sensor
Feb 16, 2011 | 1996 Oldsmobile 88
OPERATION The Manifold Absolute Pressure (MAP) sensor, used on 1996-99 vehicles, measures the changes in intake manifold pressure which result from engine load/speed changes, and converts this information to a voltage output. The MAP sensor reading is the opposite of a vacuum gauge reading: when manifold pressure is high, MAP sensor value is high and vacuum is low. A MAP sensor will produce a low output on engine coast-down with a closed throttle while a wide open throttle will produce a high output. The high output is produced because the pressure inside the manifold is the same as outside the manifold, so 100 percent of the outside air pressure is measured.
The MAP sensor is also used to measure barometric pressure under certain conditions, which allows the PCM to automatically adjust for different altitudes.
The MAP sensor changes the 5 volt signal supplied by the PCM, which reads the change and uses the information to control fuel delivery and ignition timing.
TESTING See Figures 1 and 2
Fig. Fig. 1: Manifold Absolute Pressure (MAP) sensor circuit
When pumping up and releasing the vacuum, check to make sure the voltage readings are smooth. When applying vacuum to the sensor, the change in voltage should happen instantly. A slow change in voltage could point to a faulty sensor.
Fig. Fig. 2: MAP sensor voltage specifications
REMOVAL & INSTALLATION
3.8L (VIN K) Engine
See Figure 4
On these engines, the MAP sensor is mounted to the PCV valve cover.
Fig. Fig. 4: On the 3.8L (VIN K) engine, the MAP sensor (1) is mounted in the PCV valve cover (2)
Nov 27, 2010 | 1992 Oldsmobile 88
Oct 20, 2009 | 1987 Oldsmobile Delta 88
Sep 23, 2009 | 1988 Oldsmobile Delta 88
May 15, 2009 | 1989 Honda Civic
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