What is a map sensor?

Question

What is a map sensor and what does it control or detect? Also...what is a knock sensor? What does it do? Thanks!

dodgeman....thank you for your answer. But I have more questions about it...Is there any way you can email me about this question. Just click on my name "me" and then click on where it says to email this person. Thank you.

Answer 1

MAP is short for manifold absolute pressure sensor,,it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly,it throws off the whole loop cycle for the computer,,which in turn makes it run badly,,and get poor fuel economy,,it causes one to have a lack of power,,combined with a loss of fuel economy,,and also poor take offs,,and sometimes an occasional stalling,,i hope this help,s i own a repair shop in Tennessee,,and do this kind of work ll the time,,good luck with it.,,i left out a part,,the knock sensor,,senses vibration,,and helps with balancing the ignition system so the engine will run smooth,it does this by helping control the timing,,along with other sensors.

Answer 2

What Is A Map Sensor

Answer 3

MAP sensor MAP stands for manifold absolute pressure.It tells the computer how much air is actually flowing through the manifold,another way of looking at it,it's vacuum,if you have changed the MAP and you still have a problem then look for a vacuum leak on the intake manifold after the throttle housing,it could even be the vacuum hose to the MAP try spraying the intake area with water in a squirt bottle if the engine stalls you have norrowed down where the leak is,TIP DISCONNECT MAP SENSOR WHILE YOU DO THIS,GMs have some adaptive memory so it will run not to bad with it disconnected while you try to locate the vacuum leak

Answer 4

MAP(manifold Absolute Pressure) sensor, it measures the pressure of the intake air. using MAP sensor and the air temp sensor the computer determine the air mass so that it know how much fuel the mix with the air.
The knock sensor bick up misfire in the engine. If the engine fire before the it suppost to the knock sen will tell the computer and the computer will retare or advance the ignition timing.

Answer 5

a map sensor is a m.a.p. sensor or manifold absolute pressure sensor. it measures the pressure (vacuum) inside the intake manifold. it is an input for how much fuel the computer should tell the injectors to provide (one of the many sensors that do). the knock sensor is a sensor that detects "ping" which stands for Pre-INGnition. pre-ignition is also referred to as knock. what can happen is a hot spot inside the engine cylinders can ignite the fuel and air in the cylinder prematurely (hence the name pre-ignition). this can be very hot and harmful to the engine and can cause a complete engine failure.

Answer 6

MAP: Manifold Absolute Pressure. It detects the air pressure inside the intake manifold. The PCM uses this to maintain the air: fuel ratio.

The knock sensor is a piezoelectric crystal (I think that's a fancy name for quartz) that detects unwanted detonation (or knock) in an engine. The PCM uses this to determine the optimum ignition timing.

Answer 7

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RE:
What is a map sensor?
What is a map sensor and what does it control or detect? Also...what is a knock sensor? What does it do? Thanks!

Answer 8

manifold absolute pressure. it tells the computor the status of the manifold pressure, this is in relation to vacuum created in the manifold.

a knock sensor listens for a knock, from either a misfire or a rod knock which it can here.

and both of these are just one of several sensors that help control fuel and spark management

Answer 9

manifold absolute pressure - measures the air intake pressure to atmospheric pressure, which sends a signal to the ecm, to determine the best air to fuel ratio- knock sensor , detects pre-detonation, (or pinging as some call it) in the engine, which in turns sends a signal to the ecm to adjust timing and will also change the air fuel ratio. there are several other sensors that check the engine for temperature and the air(cold air intake sensor) temperature which will also effect the air fuel ratio and timing

Answer 10

Manifold Air Pressure (M.A.P.) is used to calculate intake air pressure. Knock sensor 'senses' engine knock in the combustion chamber and corrects air/fuel /timing ratio to prevent it.