Grand Fury/Salon V8-318 5.2L VIN R (1985)
Reconnect to the engine wire harness.
(8)
Reinstall the air cleaner and unplug and reconnect the vacuum hose from the carburetor to the heated air temperature sensor on the air cleaner.
Remove the tachometer and reinstall the PCV valve. Idle speeds with the engine in normal operating condition (everything connected) may vary
from set speeds. DO NOT READJUST.
14-27 HOLLEY 2280/6280-FUEL SYSTEM
13.
PROPANE ASSISTED IDLE SET PROCEDURE (6280 MODELS)
Chrysler No.
Vendor No.
4288576
R-40121A
4288565
R-40243
Idle RPM
Propane RPM
600 RPM
700 RPM
On a new vehicle (under 300 miles/500 km) reduce RPM settings by 75 RPM. Tampering with the carburetor is a violation of Federal law. Adjustment
of the carburetor idle air fuel mixture can only be done under certain circumstances as explained below. Upon completion of the adjustment, the
concealment plugs must be replaced. This procedure should only be used if an idle defect still exists after normal diagnosis reveals no other faulty
condition as incorrect basic timing, incorrect idle speed, faulty hose or wiring connections, etc. Adjustment of the carburetor air fuel mixture should be
performed after a major carburetor overhaul.
(1)
Remove the concealment plug. Set the parking brake and place the transmission in neutral. Turn all lights and accessories off. Connect a
tachometer to the engine. Start the engine and allow it to warm up on the second highest step of the fast idle cam until normal operating
temperature is reached. Return the engine to idle and turn off engine.
(2)
Disconnect and plug the vacuum hoses at the EGR valve and ESA computer. Disconnect and plug canister purge hose at canister.
(3)
Ground the carburetor switch with a jumper wire.
(4)
Separate carburetor electrical connector from engine wiring harness. Remove (from carburetor electrical connector) the green duty cycle wire and
blue idle solenoid wire. Reconnect carburetor electrical connector to engine wiring harness minus the two removed wires.
(5)
Start and run engine for at least four minutes.
(6)
Disconnect the vacuum supply hose from the choke diaphragm at the carburetor and install the propane supply hose in its place. Other connections
at the tee must remain in place.
(7)
With the propane bottle upright and in a safe location, remove the PCV valve from the cylinder head cover and allow the valve to draw underhood
air.
(8)
Open the propane main valve. Slowly open the propane metering valve until the maximum engine RPM is reached. When too much propane is
added, engine RPM will decrease. "Fine tune" the metering valve to' obtain the highest engine RPM.
(9)
With the propane still flowing, adjust the idle speed screw on the solenoid to obtain the correct propane RPM. Again, "fine tune" the metering
valve to obtain the highest engine RPM. If there has been a change in the maximum RPM, readjust the idle speed screw to the specified propane
RPM.
(10) Turn off the propane main valve and allow the engine speed to stabilize. Slowly adjust the mixture screws by equal amounts, pausing between
adjustments to allow engine speed to stabilize, to obtain the smoothest idle at the correct idle RPM.
(11) Turn on the propane main valve and "fine tune" the metering valve to obtain the highest engine RPM. If the maximum engine speed is more than
25 RPM different than the specified propane RPM, repeat Steps 8 through ii.
(12) Turn off propane main and metering valves. Remove the propane supply hose and reinstall the heated air sensor hose. Reinstall new concealment
plugs.
(13) Separate carburetor electrical connector from engine wire harness. Reinstall the green and blue wires in their correct positions, reconnect to the
engine wire harness.
(14) Reconnect vacuum line on ESA. Perform the solenoid idle stop, idle RPM, and fast idle speed adjustment procedures.
