Map sensor location 91 olds 88,3800 rng, No seriously I can

RFREEZY

MEMBER
2012 OLDSMOBILE

? Howdy, I am having one heck of a time finding the map sensor on the wifes 1991 Olds 88 royale brougham with a 3800 engine. I wish to have it checked to see if it's bad and causing the high idle problem. I have checked extensively for vacuum leaks and have found none. Replaced the mass air flow sensor and the one down there by the throttle position sensor that I can never seem to remember the name of. I have not yet replaced the throttle position sensor. I have plugged everything in hopes of finding a vacuum leak but to no avail. The car also likes to cut out when you reach a certain change in altitude as well. Any help would be appreciated, especially if someone could tell me where to find the map sensor, I traced every vacuum line and can't find it. Unless they have it mounted behind the electrical panel or on the cruise control I dunno where it is.
Thanks.
rfreezy, aka Krash

2 Replies

BOBBY71

MEMBER
13 POSTS

Map sensor should be some were on the intake manifold it uses vacum from the motor to monitor things .I would put it on a scanner and see whats going on. Go to autozone you can rent one for free just have to put a deposit. The connection for the scanner is under the drivers side dash. It would be cheaper then replacing all the sensors. When was the last time you replaced the o2 sensor. And plugs.

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Wednesday, December 20th, 2006 AT 12:23 PM

RFREEZY

MEMBER
2 POSTS

Since I have posted this I have changed the fuel pressure regulator and the throttle position sensor. I t has gotten better far as starting and cutting out, still idles a bit high though. I haven't changed the O2 sensor on this car yet. I own a scan tool for the obd2 systems. Unfortunately this car is still obd1. I didn't know auto zone rented the obd1 tool too. But if I remember correctly on the obd1 systems doesn't the light have to be on for it to read a code. Unfortunately I have no light on. Yes it does still work, lol. Found out when I manually dropped the idle as far as it woul let me. I have turned it back up a little since truning it down, It didn't change it a whole lot to begin with, just enough so the engine didn't sound like lifter slap.

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Wednesday, December 20th, 2006 AT 12:29 PM