PB 150 V8-318 5.2L VIN T 2-BBL (1983)
Remove the metering rod cover plates, then remove the step-up piston and link assembly with the step-up rods.
Remove the step-up piston spring and install Step-Up Spring, PN 3621172.
Reassemble carburetor in reverse order.
Readjust the secondary air valve spring wrap-up tension adjustment to 4-1/2 turns after valve contact with the stop. Use the air door
adjustment procedure outlined in the service manual.
Replace EGR valve with PN 4287675.
Revise engine speeds as outlined below:
Install VECIU Label, PN 4275084, next to original VECI label with information describing this modification.
These altitude modifications are complete packages and must be serviced as such.
Installation of A Vacuum Reducer Valve
INSTALLATION OF A VACUUM REDUCER VALVE ON A 2.2L-2BBL ENGINE EQUIPPED WITH THE NYLON VACUUM HOSE HARNESS
VACUUM REDUCER INSTALLATION PACKAGE PN 4293794
1 - Vacuum Reducer Valve
1 - Connector, In-Line (.15 nylon to
1 - Connector, Elbow (.15 nylon to
1 - Tee
Carefully cut the tape around the vacuum harness convoluted tubing at the end closest to the coolant switch.
Peel the convoluted tubing away from the nylon tubes and cut 2" from the front of the engine clip that mounts the vacuum harness to the air pump
pulley cover. Discard the cut piece of convoluted tubing.
Locate the nylon vacuum tube running from the CVSCC (CCEGR) coolant switch on the side of the water control box nearest to the white dot on
Cut the tube located in Step 3 2.5" from the CVSCC and 2.5" from the vacuum harness mounting clip. When cutting the nylon hose, use a sharp
razor so the hose won't kink. Discard the unused hose.
Install the small end of the In-Line Connector, PN 4179391, on the cut end of nylon tube closest to the CVSCC. Install the small end of the Elbow
Connector, PN 4213774, on the cut end of nylon tube closest to the harness mounting clip. Orient the elbow connector such that the 3/16" end is
pointed toward the CVSCC.
Install the Vacuum Reducer Valve, PN 4104184 (white nipple), between the connectors installed in Step 5. Position the vacuum reducer valve
such that the third nipple points downward.
Locate the blue striped vacuum hose in front of the carburetor.
VACUUM REDUCER INSTALLATION PACKAGE PN 4293794 - Page 2
Cut the blue striped hose 2.5" from the air pump pulley cover, approximately in front of the air cleaner mounting bracket, and insert the Tee, PN
Cut an 18" length of 3/16" rubber hose (Bulk Stock PN 3780507) and install on the tee. Route this hose over the valve cover next to the air pump