Suburban 1/2 Ton 2WD V8-454 7.4L (1987)
View A
3.
On 1987-88 models only, relocate Map Sensor to Air Cleaner.
A.
Check Map Sensor operation using procedures on Page 3-122 and 3-123 of the 1991 Fuel and Emission Manual, replace sensor if necessary.
B.
Disconnect vacuum tube assembly and electrical connection from Map Sensor.
View B
C.
Remove Map Sensor from upper plastic bracket (See Illustration, View B). CARE MUST BE TAKEN TO AVOID BREAKING
BRACKET.
D.
Remove sheet metal screw holding upper plastic bracket to lower metal bracket, and retain plastic bracket.
