Diplomat V8-318 5.2L VIN 4 2-BBL (1983)
9.
Install propane enrichment tool as follows:
a. On BBD models, disconnect hose from heated air door, then connect hose from metering valve on enrichment tool to fitting.
b. On Thermo-Quad models, remove bowl vent vacuum hose from carburetor nipple, then install a suitable T-fitting between nipple and vacuum
hose. Connect hose from metering valve on enrichment tool to fitting. Make sure that propane cylinder remains upright during procedure.
10.
Remove PCV valve from cylinder head cover and allow to draw underhood air.
11.
Disconnect and plug control hose at canister.
12.
On models equipped with oxygen sensor feedback, disconnect electrical connector from oxygen sensor and ground connector. Remove and plug
vacuum hose at vacuum transducer on SCC, then install suitable vacuum pump to vacuum transducer, apply 16 inches of vacuum, and allow
engine to run for two minutes.
13.
On models without oxygen sensor feedback, allow engine to run for one minute.
14.
On all models, open main propane valve fully. Slowly open propane metering valve until maximum idle RPM is obtained. Too much propane
will cause engine speed to drop. Adjust metering valve to obtain maximum idle RPM.
15.
With propane flowing, adjust idle speed to specified enriched RPM, Fig. 2, by turning idle speed screw.
16.
Adjust metering valve to obtain maximum RPM. If there has been a change in maximum RPM, readjust idle speed screw to specified enriched
RPM.
17.
Turn off main propane valve and allow engine speed to stabilize.
18.
Adjust mixture screws to obtain smoothest idle at specified curb idle RPM, allowing time between adjustments for engine speed to stabilize.
19.
Turn on main propane valve and adjust metering valve to obtain maximum engine RPM. If maximum engine speed differs by more than 25 RPM
from specified enriched RPM, repeat steps 14 through 19.
20.
When adjustment is correct, turn off both propane valves, stop engine and remove tool.
21.
Install concealment plug, if equipped, then perform ``Curb Idle Speed, Adjust'' and ``Fast Idle Speed, Adjust'' procedure.
