V 3500 P/U 4WD V8-454 7.4L VIN W 4-bbl (1988)
FIGURE 1
Service Procedure:
1.
Check MAP sensor using the procedures on page 3-74/3-75 of the 198 Fuel and Emissions Manual, X-8836. Replace sensor if necessary.
2.
Disconnect vacuum tube assembly and electrical connection from MAP sensor.
3.
Remove MAP sensor from upper plastic bracket (See Illustration View B). Care must be taken to avoid breaking bracket.
4.
Remove sheet metal screw holding upper plastic bracket to lower metal bracket, and retain plastic bracket.
5.
Add one additional 3/16" hole to plastic bracket and two 1/8" holes in air cleaner, using revised bracket as hole template (See Illustration View C).
6.
Mount bracket so MAP sensor vacuum connection faces down toward engine, using two 8-32 x 1/2 sheet metal screws, P/N 447164.
