why would you unplug a map sensor? - MustangForums.com


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Old 06-18-2013, 07:44 PM   #1
duncan01
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Default why would you unplug a map sensor?

my car is an 88 lx originally a speed density car converted to mass. Just noticed that the map sensor is unplugged. It appears there it no place to plug it in on this aftermarket intake. I guess my question is do I need it and will it hurt anything. Side effects?

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Old 06-18-2013, 08:56 PM   #2
capri debris
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What exactly is unplugged... the vacuum hose or the electrical connector?

A speed density M.A.P. (manifold absolute pressure) sensor will have a vacuum hose connected to the intake, because speed density is dependent on manifold vacuum to tell the ECU how far the throttle is opened and uses a pre-set table of how much air is entering the engine and adds fuel accordingly.

Mass air cars use the same sensor, but without a hose connected which essentially converts the M.A.P. sensor into a barometric pressure sensor that gauges atmospheric pressure so the ECU knows what altitude the vehicle is operating at and how dense the air charge is. The ECU knows how much volume of air is entering the engine by the mass air sensor and uses the "MAP" sensor to tell it exactly how dense that air happens to be.

So in other words, if the electrical connector is connected and the car has been converted to mass air, you shouldn't have a vacuum hose connected to the sensor.
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Old 06-18-2013, 08:57 PM   #3
Duncan_GT
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I may be wrong, but if its been converted from SD to a MAF setup, then there is no need for the MAP. It does, however, use the same sensor from what I've seen.

Edit - Capri beat me before I could edit.

Last edited by Duncan_GT; 06-18-2013 at 09:00 PM.
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Old 06-18-2013, 09:15 PM   #4
duncan01
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Sorry fellas, I was in the garage and had a thought and just turned around and started typing it before using the one rule we should all know. Google!!
Two seconds after I posted it I found the answer. Sorry you took the time to respond thanks for the quick reply.

Wont happen again.

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Old 06-18-2013, 09:52 PM   #5
mjr46
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map become a baro sensor and vaccum line is not connected to intake anymore/period
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