Look on the back of the intake manifold, to the left of center. It may be a rectangular box.
if it has a 3.3 there is no map sensor
Yes.
The map sensor is on the air intake line to the throttle body....
The map sensor on a 1990 Ford 5.8 EFI Bronco is on the passenger side. It is located on the firewall.
MAP sensor
The PCV valve is located under the MAP sensor on a 1990 Pontiac Grand Prix. The MAP sensor is in the upper plenum.
After consulting several sources, someone finally called a local Buick dealer who informed me that a 1990 LeSabre does NOT have a map sensor, it was the Mass Air Flow sensor that needs replacing.
On the firewall on the pass side.
The map sensor is located on the fire wall towards the passenger side right under the wind shield.
passenger side
Below
On a 1990 Buick Century with a V6 3.3 engine, the manifold absolute pressure (MAP) sensor is typically located on the intake manifold, often near the throttle body. It may be mounted on the firewall side of the engine, connected to a vacuum source. To access it, you may need to remove some components for better visibility. Always refer to a repair manual for specific details related to your vehicle.