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Tune Up - Service Manual Corrections

85chrysler05

Models


1985 Chrysler Fifth Avenue, Dodge Diplomat, & Plymouth Gran Fury


Subject


Service Manual Revisions


Index


FUEL

Date

August 12, 1985


No..


14-26-85


P-2934-C
The following corrections should be made to the 1985 Rear Wheel Drive Passenger Car Service Manual, publication #81-270-5001. These corrections reflect changes in the ignition timing, solenoid idle speed and idle rpm adjustment, fast idle speed adjustment, and propane assisted idle set procedure which should be made in your service manual.

Page 8-77 -IGNITION TIMING

Step (4) should read:

Disconnect and plug vacuum line at ESA unit, start engine, set parking brake, place transmission in neutral, and run until normal operating temperature is obtained.

Step (11) should read:

Turn the engine off. Unplug and reconnect vacuum line at ESA unit. Remove the jumper wire (if installed) and tachometer.

Pages 14-24 and 14-25 - SOLENOID IDLE SPEED AND IDLE RPM ADJUSTMENT (6280 MODELS) AND FAST IDLE SPEED ADJUSTMENT

Glue or staple the attached replacement pages that provide revised adjustment procedures, specifications, and additional carburetor application information for both adjustments.

Page 14-27 - PROPANE ASSISTED IDLE SET PROCEDURE

Glue or staple the attached replacement page which provides a revised procedure, specifications, and additional carburetor application information for this procedure.

POLICY: Information only
14-24 HOLLEY 2280/6280-FUEL SYSTEM

9. SOLENOID IDLE SPEED AND IDLE RPM ADJUSTMENT (6280 MODELS)

Before checking or adjusting any idle speed, check ignition timing and adjust if necessary using the procedure shown in Group 8 Electrical. Disconnect and plug the vacuum hose at the EGR valve. Disconnect and plug the hose from the carburetor at the heated air temperature sensor. Remove air cleaner and disconnect and plug the canister purge hose at the canister. Remove the PCV valve from the valve cover and allow the valve to draw underhood air. Disconnect and plug the vacuum advance at the ESA unit. Install a tachometer.

Chrysler No. Vendor No.

Solenoid 4288576 R-40121A
RPM 775 4288565 R-46243
Idle RPM 600

On a new vehicle (under 300 miles/500 km), reduce RPM settings by 75 RPM.
(1) 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.
(2) Ground the carburetor switch with a jumper wire.
(3) Connect a jumper wire between the battery positive post and the solenoid idle stop lead wire (blue). CAUTION: Use care in jumping to the proper wire on the solenoid. Applying battery voltage to other than the correct wire will damage the wiring harness.

Idle Speed Adjustment:




4) Run the engine in Neutral on Step 2 of the fast idle cam until engine is fully warmed up. This will take five to ten minutes.
(5) Return engine to idle and proceed promptly with the solenoid idle stop adjustment.
(6) Open throttle slightly to allow solenoid plunger to extend. Remove solenoid outer screw and spring. Insert a 1/8 inch allen wrench into solenoid and adjust solenoid idle speed to specification.
(7) Install screw and spring, and turn in screw until it lightly bottoms out. Remove jumper wire. Set idle speed to specification by turning out solenoid screw.
(8) Remove tachometer, unplug and reconnect all hoses, reinstall PCV valve and air cleaner.
(9) Separate carburetor electrical connector from engine wire harness. Reinstall the green and blue wires in their correct positions. Reconnect to the engine wire harness.

10. FAST IDLE SPEED ADJUSTMENT

Before checking or adjusting any idle speed, check ignition timing and adjust if necessary using the procedure shown in Group 8 Electrical. Disconnect and plug the vacuum hose at the EGR valve. Also disconnect at the heated air temperature sensor. Remove the air cleaner and disconnect and plug the 3/16 inch diameter control hose at the canister. Remove the PCV valve from the cylinder head cover and allow the valve to draw underhood air. Disconnect and plug the vacuum hose at the ESA unit. Install tachometer.

Model RPM Chrysler No. Vendor No.

6280 1700 4288576 R-40121 A
4288565 R-40243
2280 1600 4288578 R-40157A
4288581 R-40245

On a new vehicle (under 300 miles/50 km), reduce RPM settings by 75 RPM.
ATTACH WRITE UP TO LEFT COLUMN OF PAGE 14-25

DISCARD LEFT COLUMN OF THIS PAGE.
10. FAST IDLE SPEED ADJUSTMENT

(1) Model 6280 only - separate carburetor electrical connector from engine wiring harness. Remove (from carburetor electrical connector) the green duty cycle wire and blue idle solenoid wire. Reconnect electrical connector to engine wiring harness minus the two removed wires.
(2) Ground the carburetor switch with a jumper wire.
(3) Open the throttle and place the fast idle adjusting screw on the second highest step of the fast idle cam.
(4) With the choke fully open, turn the fast idle adjusting screw until the correct fast idle speed is obtained.
(5) Return to idle then reposition the adjusting screw on to the second highest step of the fast idle cam to verify fast idle speed. Readjust if necessary.
(6) Return to idle and turn the engine off. Unplug and reconnect the vacuum hoses at the EGR valve and canister. Remove jumper wire.
(7) Model 6280 only - separate carburetor electrical connector from engine wire harness. Reinstall the green and blue wires in their correct positions. 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.
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