hmmm do we have MAP sensors....91 3.1.??? if it does, tell me all about it...(where it is, what it does, how much it costs, commoon problems with it, how to fix it..etc etc) THANKS A MILLION GUYS

 

yes you do have a MAP sensor

it located on the passenger side of your engine bay below the cowl
it looks like a little rectangular pill box with a vacuum line going into it

if anything goes wrong with it, it has to be replaced, its not serviceable

i'm not sure on a price but:
their not much
go to www.napaonline.com to get a ballpark price

what the MAP sensor does it messure the pressure (actually pressure differential) change inside the intake manifold

because as engine load changes, so does the vacuum inside the engine

 

any way to tell if it is busted??

 

You will get a C.E.L. and you will have one hella vacume leak.

 

well i have been trying to track down "one hella vacuum leak" for some time now, but i have not had the SES light go off. i checked for codes with a paper clip.....got only code 12's. so is there any way to check the MAP sensor????

 

You can probably see if it's output is on par with a multimeter...but how to do that is beyond me...I'm not good with electronics. Bought my digital multimeter and I still havent found a use for it yet..this stuff's over my head.

 

Yeah, the GM Service Manual ( http://www.helminc.com ) would tell you how to measure the map with a meter.

 

measure the ohms and the frequency of it