MAP Sensor - Off-Road Forums & Discussion Groups
Ford 67-96 F-Series, 78-96 Bronco All discussions of 67-96 F-Series Trucks and 78-96 Broncos

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 01-30-2001, 02:55 PM
Posts: n/a
MAP Sensor

Hello all, can anyone tell how I can check to see if my MAP (not MAF) sensor is good or bad. I have an '88, 351 Bronco. Thanks in advance.

Sponsored Links
post #2 of (permalink) Old 01-30-2001, 04:36 PM
Posts: n/a
Re: MAP Sensor

I don't know how to check them. Which doesn't help, however from what I've heard they are either good or bad.

Try pulling the codes and next time you write include some details as to what your problem is. The guys are real good about "hearing" a problem and giving you a way to fix it.
Hope this helps

1989, 351, C6, 15x10's and 31's
post #3 of (permalink) Old 01-30-2001, 07:15 PM
Mud in my Veins
Steve83's Avatar
Join Date: Dec 2000
Location: Memphis, TN
Posts: 5,301
Thanks: 0
Thanked 0 Times in 0 Posts
Re: MAP Sensor

The Haynes manual ($12 at any parts store) gives the test procedure for most of the electronics on the engine. The MAP test procedure involves testing between each pair of the 3 terminals with a multimeter, so it's almost impossible to describe in text - you need the illustrations in the manual.

83 Custom w/95 4.9L EFI, 78 NP435, 83 NP208, 83 D44IFS 3.07, 87 Ford 8.8ABS 3.08, Michelin LTX AT 31x10.50R15
Steve83 is offline  
Sponsored Links
post #4 of (permalink) Old 01-31-2001, 06:27 AM
Join Date: Oct 1999
Posts: 89
Thanks: 0
Thanked 0 Times in 0 Posts
Re: MAP Sensor

My 92 351 W uses a map sensor which produces a frequency from 220 hz to 100 hz. this variation tells the computer about the load condition. The manual says it a voltage but it lied to me.

If I unplug the vacuum to the sensor the truck will run very poorly. And with the engine off and then pull the vacuum line off and try to start the engine it will not have enough timing to start.

I tested mine with 12 volt power supply, a hand vacuum pump and scope. really suck without a scope.

Good luck

[img]/wwwthreads_images/icons/cool.gif[/img] My Jeep's an ATV I can drive on the highway [img]/wwwthreads_images/icons/cool.gif[/img] but it likes the dirt. [img]/wwwthreads_images/icons/cool.gif[/img]
MudLake is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not 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

For the best viewing experience please update your browser to Google Chrome