What is a map sensor?(location)
08-26-02, 01:39 AM
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What is a map sensor?(location)
I know its stupid but just wondering what is the function of a map sensor/boost sensor? Also what will happen if it goes bad or is disconnected?
08-26-02, 04:49 AM
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Re: What is a map sensor?(location)
Originally posted by faisalk
I know its stupid but just wondering what is the function of a map sensor/boost sensor? Also what will happen if it goes bad or is disconnected?
I know its stupid but just wondering what is the function of a map sensor/boost sensor? Also what will happen if it goes bad or is disconnected?
If you disconnect it, then your ECU will think that you have a steady air pressure(whatever it may be) and feed your engine the wrong amount of fuel and give it the wrong ignition timing.
08-26-02, 06:03 AM
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Re: Re: What is a map sensor?(location)
Originally posted by jspecracer7
Map(Mass Air Pressure) sensor or commonly referred to as a boost sensor measures boost and sends a signal to the computer so that it can decide which part of the fuel/ignition map to go to. The ECU referrences boost and rpm's and takes the value within that map and applies it to the necessary injectors/ignition.
If you disconnect it, then your ECU will think that you have a steady air pressure(whatever it may be) and feed your engine the wrong amount of fuel and give it the wrong ignition timing.
Map(Mass Air Pressure) sensor or commonly referred to as a boost sensor measures boost and sends a signal to the computer so that it can decide which part of the fuel/ignition map to go to. The ECU referrences boost and rpm's and takes the value within that map and applies it to the necessary injectors/ignition.
If you disconnect it, then your ECU will think that you have a steady air pressure(whatever it may be) and feed your engine the wrong amount of fuel and give it the wrong ignition timing.
.Also to note or add to J comments.
The car will run like it has a blown motor. Kicks, bucks, and spits out black smoke because the ecu just pours fuel into the motor. Usally it fouls the plugs, and also you should go ahead and change the oil while you are at it.
-Rikki
08-26-02, 06:40 AM
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MAP = Manifold Absolute Pressure. It measures the pressure in the intake manifold relative to absolute vacuum (so the signal can be vacuum relative to the atmosphere).
Mass Air is a different sensor for a different fuel injection system, but the rest of the description was correct -- the ECU chooses a cell in the fuel map based on speed (RPM) and density (pressure and temperature) to decide how long to hold the injectors open.
-Max
Mass Air is a different sensor for a different fuel injection system, but the rest of the description was correct -- the ECU chooses a cell in the fuel map based on speed (RPM) and density (pressure and temperature) to decide how long to hold the injectors open.
-Max
08-26-02, 07:23 AM
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Originally posted by maxcooper
MAP = Manifold Absolute Pressure. It measures the pressure in the intake manifold relative to absolute vacuum (so the signal can be vacuum relative to the atmosphere).
MAP = Manifold Absolute Pressure. It measures the pressure in the intake manifold relative to absolute vacuum (so the signal can be vacuum relative to the atmosphere).
08-26-02, 07:23 AM
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Originally posted by Dragon
location of the MAP sensor is directly behind the throttle body on the fire wall..
location of the MAP sensor is directly behind the throttle body on the fire wall..
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07-12-03, 04:30 PM
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in most cases when a MAP is left disconnected, the ECU goes into "limp home" mode. It knows that its 5V reference is not making it to the sensor and switches to said mode. It does not "believe" it is seeing any normal situation partly becuase there is no situation in which the ECU gets back 0 volts from the sensor.
It is bad to leave it disconnected though. It makes the car run super rich, as was mentioned, and the effects of that are well known.
greg
It is bad to leave it disconnected though. It makes the car run super rich, as was mentioned, and the effects of that are well known.
greg
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