If you think your silverado map sensor is going bad this how to guide can help you test it.
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When testing a map sensor first make a preliminary check.
Ground is provided by the pcm too thru the wire labeled with the number 3.
When problems arise it s more likely that the vacuum hose has failed.
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The computer then decides whether to increase or decrease fuel supply to the engine and adjust spark advancement accordingly.
This is what happens when you turn the key and start the engine.
Top 5 bad map sensor symptoms.
This is because the map sensor measures absolute pressure based on a perfect vacuum rather than atmospheric pressure.
However the time will eventually come when the map sensor does malfunction because of damage or wear.
Today i ll be showing you how to test the manifold absolute pressure sensor in a 2007 chevy silverado with a 5 3 liter engine in it.
Otherwise it connects directly to intake.
A bad map sensor sending the wrong signal to the.
Once that happens there will be one or more recognizable symptoms that will pop up and catch you by surprise.
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Symptoms of a bad or failing map sensor include.
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Once the map sensor gets power and ground it now starts to measure the amount of vacuum the engine is producing and shoots the info to the pcm thru the wire labeled.
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A failed map sensor has serious implications on fuel control vehicle tailpipe emissions and fuel economy.
At 20 hg the map sensor will indicate about 5 psi.
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A map sensor continually compares atmospheric absolute pressure to the intake manifold vacuum and sends the appropriate voltage signal to the vehicle s computer.
In order to complete this test however you will need to use a digital multimeter to read the voltage at the engine.
How to test a map sensor.
The map sensor should remain functional for a very long time.
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The sensor connects to the intake manifold with a rubber hose depending on your particular application.