Question about 1996 Plymouth Grand Voyager
Hi there. First thing I'd look at is the fuel supply to the engine - I mean the pipework and in particular all rubber fuel lines. When the ambient temperture is hot, any trapped rubber/plastic fuel lines are more likely to become restricted thus starving your engine of fuel. Of course, during the winter months the flexible/rubber/plastic fuel lines are more rigid and therefore less likely to be squeezed closed or cause a restriction. You may need to use the services of a Dealer or Fast Fit Centre to raise the vehicle and check all the fuel lines under the vehicle and around the fuel tank too. Hope this helps. Scottech.
Posted on Jun 17, 2009
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Posted on Jan 02, 2017
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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)
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