Altitude Conversion Procedures
2.2L Rampage & Scamp - Automatic & Manual Transmission^ Install the following parts:
1 - Main Metering Jet PN 4131173
1 - Vacuum Reducer Package PN 4293794
^ Install the Primary Main Metering Jet, PN 4131173, using procedures outlined in the service manual.
^ Install the Vacuum Reducer Package, PN 4293794, using the installation procedure attached.
^ Revise engine speeds as outlined below:
Application Idle Set Propane RPM H.F.I.
Automatic Transmission 900 975 1500 (S-3)
Manual Transmission 775 850 1300 (S-3)
3.7L (225-1BBL) Truck - Automatic & Manual Transmission
^ Install the following parts:
1 - Vacuum Reducer Package PN 4293798
^ Install the Vacuum Reducer Package, PN 4293798, using the installation procedure attached.
^ Revise engine speeds as outlined below:
Application Idle Set Propane RPM H.F.I.
Automatic Transmission 650 725 1600 (S-2)
Manual Transmission 600 675 1600 (S-2)
^ Install VECIU Label, PN 4275084, next to original VECI label with information describing this modification.
5.2L 2BBL (318-2BBL) Trucks With Aspirators Automatic & Manual Transmission
^ Revise engine speeds as outlined below:
Application Idle Set Propane RPM H.F.I.
Both Transmissions 750 850 1500 (S-2)
^ Install VECIU Label, PN 4275084, next to original VECI label with information describing this modification.
5.2L 4BBL (318-4BBL) Truck - Automatic & Manual Transmission
^ Install the following parts:
2 - Secondary Metering Jets PN 3744772
1 - Step-Up Spring PN 3621172
1 - EGR Valve PN 4287675
^ Replace the Secondary Metering Jets, PN 3744772 - two required, using the procedure outlined in the service manual.
^ Replace the Step-Up Spring, PN 3621172, using the following procedure:
1. Remove the step-up piston cover plate attaching screw and cover plate.
2. Remove the rod connecting the choke shafts.
3. Remove the metering rod cover plates, then remove the step-up piston and link assembly with the step-up rods.
4. Remove the step-up piston spring and install Step-Up Spring, PN 3621172.
5. Reassemble carburetor in reverse order.
6. 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:
Application Idle Set Propane RPM H.F.I.
Both Transmissions 750 840 1600 (S-2)
^ 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.
POLICY: Information only