# MAP Sensors **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [July 17, 2008, 7:25pm UTC](https://community.cartalk.com/t/map-sensors/16853 "2008-07-17T19:25:35Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 17, 2008, 7:25pm UTC](https://community.cartalk.com/t/map-sensors/16853/1 "2008-07-17T19:25:35Z")
MAP or Manifold Air Pressure Sensors have replaced the old classic car Vacuum Advance in Computerized Automoble Control Systems, so how do they function, internally? ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [July 17, 2008, 7:59pm UTC](https://community.cartalk.com/t/map-sensors/16853/2 "2008-07-17T19:59:42Z")
No, they haven’t. They serve an entirely different function. ---
**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\ **Post date:** [July 17, 2008, 8:12pm UTC](https://community.cartalk.com/t/map-sensors/16853/3 "2008-07-17T20:12:49Z")
It’s Wikipedia for you. ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 17, 2008, 10:41pm UTC](https://community.cartalk.com/t/map-sensors/16853/4 "2008-07-17T22:41:45Z")
Wikipedia is available for any “Snow Job”. So, plug-up the tiny hole in the MAP Sensor, that is used to input atmospheric pressure, and see if your engine calculates the air intake volume any better, uses less gasoline, or retards the timming, slightly! Actually, many are tunning their engine better by altering the MAP Sensor Curve! But, most people are too busy or too dumb to study the Secret Software, if available. However, THE COMPUTER is the PERFECT ROBOT that never questions its MASTERS! The V-8 Engine was perfected by 1957 with no secret software, and has not improved with computers. ---
**Author:** ![hallkbrdz](https://avatars.discourse-cdn.com/v4/letter/h/46a35a/32.png) [@hallkbrdz](https://community.cartalk.com/u/hallkbrdz)\ **Post date:** [July 18, 2008, 12:37am UTC](https://community.cartalk.com/t/map-sensors/16853/5 "2008-07-18T00:37:33Z")
I assume you are joking - or ignorant. “not improved with computers” ?? “the Secret Software” A MAP sensor measures the amount of air pressure (or rather vacuum) in the engine manifold. The computer can then use that information, along with output from the oxygen sensors and temperature sensors to determine how much fuel to put in the engine to get an optimal burn (factory - for emissions, aftermarket - for power). They are basically just a pressure measuring device. A MAF sensor is also commonly used. It’s different in that it measures air flow instead of pressure. These are more commonly found on turbo charged engines in addition to the MAP sensor. Q: What V8 cars in the 1950’s had around 400 HP, started every time, could be easily driven at slow speeds, and had “tune ups” every 50,000 miles? A: None. ---
**Author:** ![vwfueldoor](https://avatars.discourse-cdn.com/v4/letter/v/e95f7d/32.png) [@vwfueldoor](https://community.cartalk.com/u/vwfueldoor)\ **Post date:** [July 18, 2008, 12:41am UTC](https://community.cartalk.com/t/map-sensors/16853/6 "2008-07-18T00:41:12Z")
absolute(NOT AIR PRESSURE) LAY OFF THE CRACK,please ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [July 18, 2008, 12:45am UTC](https://community.cartalk.com/t/map-sensors/16853/7 "2008-07-18T00:45:34Z")
[![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/DoNotFeedTroll.svg/225px-DoNotFeedTroll.svg.png) ](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/DoNotFeedTroll.svg/225px-DoNotFeedTroll.svg.png) ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:12am UTC](https://community.cartalk.com/t/map-sensors/16853/8 "2008-07-18T01:12:45Z")
Did they improve the ENGINES, or just play around with it and reduce the efficiency and increase the size of the pistons and the gasoline thirst by adding fixed, computerized settings? Actually, the four cylinder engine was perfected at about the same time. So, Why don’t WE improve the REAR END TORQUE Efficiency, instead of the speed, the thirst, and the thrust? ---
**Author:** ![Jad2007](https://avatars.discourse-cdn.com/v4/letter/j/dec6dc/32.png) [@Jad2007](https://community.cartalk.com/u/Jad2007)\ **Post date:** [July 18, 2008, 1:14am UTC](https://community.cartalk.com/t/map-sensors/16853/9 "2008-07-18T01:14:21Z")
One word: Crazy. ---
**Author:** ![mrbean](https://avatars.discourse-cdn.com/v4/letter/m/c57346/32.png) [@mrbean](https://community.cartalk.com/u/mrbean)\ **Post date:** [July 18, 2008, 1:14am UTC](https://community.cartalk.com/t/map-sensors/16853/10 "2008-07-18T01:14:36Z")
MAP=Manifold Absolute PRESSURE Pressure. . . . . as in air pressure, inside the manifold. “Absolute” refers to the scale on which the pressure is measured (as opposed to “gauge pressure”). Who’s smoking the crack here? ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:15am UTC](https://community.cartalk.com/t/map-sensors/16853/11 "2008-07-18T01:15:46Z")
Your CRACK applies to your generation, not mine! And, it is used to warp your thinking! ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [July 18, 2008, 1:16am UTC](https://community.cartalk.com/t/map-sensors/16853/12 "2008-07-18T01:16:51Z")
My God, you really ARE schizophrenic! ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:19am UTC](https://community.cartalk.com/t/map-sensors/16853/13 "2008-07-18T01:19:02Z")
Please Explain your cartoons! Or else I won’t understand your defensive comment! ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:21am UTC](https://community.cartalk.com/t/map-sensors/16853/14 "2008-07-18T01:21:38Z")
Crazy meaning unconventional thinking or dangerous to this forum? ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:25am UTC](https://community.cartalk.com/t/map-sensors/16853/15 "2008-07-18T01:25:06Z")
Are you licenced to practice medicine, too? ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [July 18, 2008, 1:27am UTC](https://community.cartalk.com/t/map-sensors/16853/16 "2008-07-18T01:27:41Z")
You’re so clever, YOU figure it out. ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:32am UTC](https://community.cartalk.com/t/map-sensors/16853/17 "2008-07-18T01:32:32Z")
You had better check in with your other brothers. One says MAP Sensors do not measure VACUUM! Transistorized ignitions reduced TUNE-UPS, without Computers, before 1962. Computers confused most mechanics for 10 years, and sold more gasoline with dangerous additives to keep the fuel injectors working. ---
**Author:** ![Shakespirit](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Shakespirit](https://community.cartalk.com/u/Shakespirit)\ **Post date:** [July 18, 2008, 1:40am UTC](https://community.cartalk.com/t/map-sensors/16853/18 "2008-07-18T01:40:30Z")
STOP THE CAT IN THE HAT----AT NASCAR RACES? No, I’m not Jack Roash, but my youngest kid use to work for him! ---
**Author:** ![Jad2007](https://avatars.discourse-cdn.com/v4/letter/j/dec6dc/32.png) [@Jad2007](https://community.cartalk.com/u/Jad2007)\ **Post date:** [July 18, 2008, 1:42am UTC](https://community.cartalk.com/t/map-sensors/16853/19 "2008-07-18T01:42:57Z")
Crazy meaning you are completely insane.