Caravan L4-156 26L VIN G 2-bbl (1985) Air/Fuel Mixture System Information
2.
Turn off all lights and accessories, then connect tachometer.
3.
Start engine and allow to reach normal operating temperature.
4.
Disconnect cooling fan electrical connector.
5.
Allow engine to run at 2500 RPM for 10 seconds, then return to idle..
6.
Remove air cleaner fresh air duct, then install propane supply hose from propane bottle, Fig. 10, into air cleaner snorkel. Ensure bottle is in the
upright position.
7.
Open main propane valve fully, then 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.
8.
Adjust idle speed to specified enriched RPM, Fig. 11, with propane flowing.
9.
Adjust propane metering valve to highest engine RPM. If there has been a change in maximum RPM, readjust engine speed to specified enriched
RPM.
10.
Turn off main propane valve and allow engine speed to stabilize.
11.
Adjust idle mixture screw in small increments to obtain specified curb idle speed, Fig. 13, allowing time between adjustments for engine speed to
stabilize.
12.
Turn on main propane valve, then adjust metering valve to obtain highest engine RPM. If maximum engine speed differs by more than 25 RPM
from specified enriched RPM, repeat step 7 through 12.
13.
Turn off both propane valves, then remove propane supply hose and install fresh air duct to air cleaner.
14.
Install concealment plug.
15.
On vehicles equipped with A/C, set temperature control lever to coldest position and turn on A/C.
16.
Set engine speed to 900 RPM by turning idle-up screw, Fig. 7. Ensure A/C compressor is operating during adjustment.
17.
On all models, perform ``Fast Idle Speed, Adjust'' procedure.
