what does the M.A.P. sensor do - S-10 Forum
S-10 Forum is the resource on GM S-series trucks, Suspension, engine information, Body Modifications, painting tutorials.  Modifications to suit every need, budget and whim

what does the M.A.P. sensor do

Go Back   S-10 Forum > Engine and Drivetrain Tech > 262ci Forum (4.3)
New User? Register Forgot Password


 
LinkBack Thread Tools
Old 07-12-2001, 06:51 PM   #1
Registered User
 
98esten's Avatar
 
Age: 43
Join Date: Jul 2001
Posts: 1,162
Location: Winston Salem North Carolina
User is: OffLine
what does the M.A.P. sensor do

I was told it might be bad on my truck i dont know what it does
Old 07-12-2001, 07:01 PM   #2
Registered User
 
Tha_Boom's Avatar
 
Age: 79
Join Date: Jun 2001
Posts: 12,770
Location: NE PA
User is: OffLine
It is a manafold air pressure sensor. Pretty much it just measures how much vacume your engine is pulling. The computer uses this information to adjust fuel and spark.
Old 07-13-2001, 11:29 PM   #3
Registered User
 
98esten's Avatar
 
Age: 43
Join Date: Jul 2001
Posts: 1,162
Location: Winston Salem North Carolina
User is: OffLine
how can you tell if it bad
Old 07-14-2001, 01:38 AM   #4
Registered User
 
Tha_Boom's Avatar
 
Age: 79
Join Date: Jun 2001
Posts: 12,770
Location: NE PA
User is: OffLine
Ok there should be 3 wires 1 ground 1 5volt 1 return signal. (at least on the older ones) If you run a multimeter from a body ground and return signal you should see fluctuating voltage from 5 volts on down with engine running and hitting the throttle a little.

I am not sure if the pinout is the same on the newer tucks but the middle pin is the return signal on the older ones.
Old 07-16-2001, 11:49 AM   #5
General L33
 
Hotwire's Avatar
 
Join Date: Jul 2001
Posts: 1,471
Location: Summerfield, NC
User is: OffLine
duh, never thought to look in the service manual. when we get back up, I can check it. If you feel like driving back down my way, I can get your truck scanned for free.
Old 07-16-2001, 03:59 PM   #6
Registered User
 
98esten's Avatar
 
Age: 43
Join Date: Jul 2001
Posts: 1,162
Location: Winston Salem North Carolina
User is: OffLine
ok sounds good. I will call you sometime later this week
Old 03-10-2007, 06:10 PM   #7
Registered User
 
Join Date: Mar 2007
Posts: 1
Location:
User is: OffLine
Re: what does the M.A.P. sensor do

Quote: Originally Posted by 98esten
how can you tell if it bad
hey now a shout from out west.want to know conditions before
you fixed it. I'm having rough accl. & idle. ('89 4.3 TBI) feels like running out of gas.Fuel filter, ign mod, cap rotor, usual stuff?
Any help appreciated
Old 03-10-2007, 06:45 PM   #8
Registered User
 
Age: 45
Join Date: Jul 2006
Posts: 5,065
Location: Where men act like men and don't cry
User is: OffLine
Re: what does the M.A.P. sensor do

Check all your vacuum lines. Look carefuly. I had onr going to the map that was split right where it hooks to the sensor but could not see it until I bent the hose over.
Old 03-10-2007, 06:50 PM   #9
yes, that is a v6
 
s10ls's Avatar
 
Age: 91
Join Date: May 2003
Posts: 2,628
Location: orlando/englewood
User is: OffLine
Re: what does the M.A.P. sensor do

first thread ever started on s10forum?

but jammon sounds like a vacuum leak
Old 03-11-2007, 03:01 AM   #10
Registered User
 
Age: 45
Join Date: Jul 2006
Posts: 5,065
Location: Where men act like men and don't cry
User is: OffLine
Re: what does the M.A.P. sensor do

Quote: Originally Posted by s10ls
first thread ever started on s10forum?
Oh damn I let that slip by. This is an old one.
Old 03-11-2007, 04:42 PM   #11
SILENCE! I KILL U!
 
rockfan1815's Avatar
 
Age: 25
Join Date: Jan 2007
Posts: 546
Location: wapwallopen pa
User is: OffLine
Re: what does the M.A.P. sensor do

if you blip the trottle real quick from idle, the engine will bog down, this happens the most when the vac line going to it is clogged or cut open. using a volt meter should give you some answers.
Old 11-11-2010, 06:29 PM   #12
Registered User
 
Join Date: Oct 2010
Posts: 3
Location:
User is: OffLine
Re: what does the M.A.P. sensor do

My 95 s10 I just changed the ing modgule and its still running fough and I unpluged the map sensur what is it now
Old 11-12-2010, 09:56 PM   #13
King Turd Polisher
 
89Chubby's Avatar
 
Join Date: Dec 2007
Posts: 559
Location: Apache Junction, AZ
User is: OffLine
Re: what does the M.A.P. sensor do

Throttle position sensor, perhaps? (You can test them with a voltmeter.)

Also, are you getting a Check Engine Light (CEL)? Or have you tried to pull the diagnostic codes yet?
Old 08-29-2012, 12:05 PM   #14
Registered User
 
Age: 67
Join Date: Aug 2012
Posts: 5
Location:
User is: OffLine
Re: what does the M.A.P. sensor do

I have a 0-3 4.3L eng and am having problem with MAP sensor voltage on volts test eng. running volts should go up when eng. is revved but mine volts go down.what gives
Old 08-29-2012, 04:23 PM   #15
Registered User
 
burned's Avatar
 
Age: 47
Join Date: Aug 2009
Posts: 1,669
Location: Vancouver, BC
User is: OffLine
Re: what does the M.A.P. sensor do

Quote: Originally Posted by frankiel
I have a 0-3 4.3L eng and am having problem with MAP sensor voltage on volts test eng. running volts should go up when eng. is revved but mine volts go down.what gives
Test guide:
http://troubleshootmyvehicle.com/gm_...ensor_gm_1.php
Old 09-02-2012, 10:17 AM   #16
Registered User
 
Age: 54
Join Date: Oct 2004
Posts: 101
Location: Memphis, Tn.
User is: OffLine
Re: what does the M.A.P. sensor do

This is why I changd back ver to a carburetor,,just too many issues with all these electronics.....forever failing and causing poor drivability issues,,,
Old 03-09-2013, 01:52 PM   #17
Registered User
 
Age: 67
Join Date: Aug 2012
Posts: 5
Location:
User is: OffLine
Re: what does the M.A.P. sensor do

looking for a pin arraingment on a 0-3 4.3l computer i think map censor ground wire ic open or corroded at the computer
Old 03-09-2013, 08:20 PM   #18
Registered User
 
burned's Avatar
 
Age: 47
Join Date: Aug 2009
Posts: 1,669
Location: Vancouver, BC
User is: OffLine
Re: what does the M.A.P. sensor do

Quote: Originally Posted by frankiel
looking for a pin arraingment on a 0-3 4.3l computer i think map censor ground wire ic open or corroded at the computer
http://troubleshootmyvehicle.com/gm/...map-sensor-3#3

A ORG to PIN #23
C GRY to PIN #17
B LT GRN to PIN #4
Sponsored Links
Advertisement
 

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the S-10 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 03:42 PM.

Powered by vBulletin® Copyright ©2000 - 2011, Jelsoft Enterprises Ltd. SEO by vBSEO 3.2.0
SEO by vBSEO
vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.