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Old 08-29-2003, 10:33 PM   #1
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Default what does the map sensor do?

does it have anything to do with the fuel delivery? cuz i'm still geting gas miliage in the high 20s, so i figure some other sensor just be ******* up
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Old 08-29-2003, 10:36 PM   #2
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Default Re: what does the map sensor do? (JonGP4)

The MAP sensor tells the ECU how much presure is in the intake manifold. (Vacuum)
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Old 08-29-2003, 11:07 PM   #3
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Default Re: what does the map sensor do? (Chiovnidca)

It takes a(meaning one) reading of atmospheric pressure when you first turn the key on and it uses that # to determine other settings.... Fuel mixture, blah blah blah....
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Old 08-29-2003, 11:10 PM   #4
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Default Re: what does the map sensor do? (skelly ed6)

cool thats what i wanted to know, so it is fuel related
thanks
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Old 08-29-2003, 11:59 PM   #5
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Default Re: what does the map sensor do? (skelly ed6)

Quote:
Originally Posted by skelly ed6
It takes a(meaning one) reading of atmospheric pressure when you first turn the key on and it uses that # to determine other settings.... Fuel mixture, blah blah blah....
What do you mean about it taking one reading? What other settings does it determine?
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Old 08-30-2003, 02:21 AM   #6
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Default Re: what does the map sensor do? (Chiovnidca)

MAP sensor is the #1 most important sensor in the whole car. The entire fuel and timing map depends on a precise reading from the map sensor.

Better? I can't think right now. Its almost 4:30am....
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Old 08-30-2003, 06:34 AM   #7
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Default Re: what does the map sensor do? (JonGP4)

For bad gas milage, i would check your o2 sensor if its fairly old. An old sluggish o2 can cause a decent decrese in gas milage.
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Old 08-30-2003, 08:35 AM   #8
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Default Re: what does the map sensor do? (rioninja)

already replaced it with a 4 wire it helpped alittle bit but not enough for me to be satified
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Old 09-07-2003, 11:49 AM   #9
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Default Re: what does the map sensor do? (skelly ed6)

Quote:
Originally Posted by skelly ed6
MAP sensor is the #1 most important sensor in the whole car. The entire fuel and timing map depends on a precise reading from the map sensor.
To back that up....my MAP sensor just died last night, and the result is that my ecu gives me no spark, or fuel. They car is totally dead. Basically if it doesnt get that reading, then it doesnt run.

The voltage reading across the yellow, and red (from memory...dont quote me) wires is supposed to be 5v. If you dont get a reading "across" them, then put them both on one lead, and put the other lead to a ground. If you still dont get a reading, then you have a faulty MAP sensor.

-Jake
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Old 09-08-2003, 08:33 PM   #10
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Default Re: what does the map sensor do? (Superhatch)

I lied. The map sensor wont ever shut off your car. Your timing belt shearing off some teeth, and then skipping on the otherhand...will. Back to the drawing board

-Jake
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Old 09-08-2003, 08:37 PM   #11
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Default Re: what does the map sensor do? (Superhatch)

I unplugged my MAP sensor the other night while my car was running and it shut off....

Whats a good way to put my car into limp mode?
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Old 09-08-2003, 09:43 PM   #12
 
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Default Re: what does the map sensor do? (JonGP4)

Before you go jumping all over your MAP sensor, when is the last time you did a full tune up? Is your air filter clean? it should be replaced every 12K (along with your pcv) or cleaned if you have a K&N style gauze filter. How bout the fuel filter? It needs replacing every 12k as well. Don't forget the cap, rotor, and correctly gapped spark plugs, I always check the gap on new plugs which are supposedly pre-gapped you never know if they were dropped, squished, etc.... Also don't neglect the O2 sensor it has considerable impact on fuel economy. Do the easy stuff first as it is likely needed, then if you still have problems grab a digital multi meter and a helms and look into the less likely culprits. HTH

-Joel
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Old 09-09-2003, 06:59 AM   #13
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Default Re: what does the map sensor do? (Superhatch)

Quote:
Originally Posted by Superhatch
I lied. The map sensor wont ever shut off your car. Your timing belt shearing off some teeth, and then skipping on the otherhand...will. Back to the drawing board

-Jake
Uuuuum, no. The MAP sensor will kill the car. Mine went out about 1 month ago while driving & the car kept stalling out & it gave me teh MAP code. I could not keep the car running no matter what I tried until I put in another MAP sensor.
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