Today I removed the MAP sensor from my 1992 Saturn SL. Upon removal, I noticed the seal that goes around the port was stuck inside the air intake.
Using a pair of needle nosed pliers, I managed to pull the seal out. It looks as though someone had connected the MAP sensor with the seal off centre causing it to warp. Without a doubt, this must be causing a vacuum leak.
Whether or not the MAP sensor I currently have is working properly – I don’t know – but I do know that the readings it gives to the ECU are next to useless.
At the moment my car idles high if it’s moving, and is achieving 20 MPG. I intend to replace the MAP sensor shortly, and will report any changes.