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Possibly Stupid Question by FieroJam
Started on: 02-20-2008 09:34 PM
Replies: 3
Last post by: craigsfiero2007 on 02-20-2008 09:53 PM
FieroJam
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Report this Post02-20-2008 09:34 PM Click Here to See the Profile for FieroJamClick Here to Email FieroJamSend a Private Message to FieroJamDirect Link to This Post
What is a MAP sensor and what does it do?
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craigsfiero2007
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Report this Post02-20-2008 09:37 PM Click Here to See the Profile for craigsfiero2007Click Here to Email craigsfiero2007Send a Private Message to craigsfiero2007Direct Link to This Post
Refers to a manifold absolute pressure sensor, a variable resistor used to monitor the difference in pressure between the intake manifold at outside atmosphere.This information is used by the engine computer to monitor engine load (vacuum drops when the engine is under load or at wide open throttle). When the engine is under load, the computer may alter spark timing and the fuel mixture to improve performance and emissions
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Marvin McInnis
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Report this Post02-20-2008 09:44 PM Click Here to See the Profile for Marvin McInnisClick Here to visit Marvin McInnis's HomePageSend a Private Message to Marvin McInnisDirect Link to This Post
 
quote
Originally posted by craigsfiero2007:

... manifold absolute pressure sensor ... used to monitor the difference in pressure between the intake manifold at outside atmosphere.



Close, but no cigar. Whet you described would be a differential pressure sensor. The MAP measures absolute pressure in the intake manifold ... i.e. manifold pressure with respect to a perfect vacuum. Absolute pressure is directly related to the density of the air in the intake manifold.

[This message has been edited by Marvin McInnis (edited 02-20-2008).]

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craigsfiero2007
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Report this Post02-20-2008 09:53 PM Click Here to See the Profile for craigsfiero2007Click Here to Email craigsfiero2007Send a Private Message to craigsfiero2007Direct Link to This Post
Whoops, bad wording. Thanks for clearing that up.
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