Click for a vacuum diagram for taking a
high altitude car to low altitude
Click for a vacuum diagram for taking a low altitude car
to high altitude
Information
This I.S. Note outlines adjustments for optimum engine performance on 1984 AMC Eagle
models being operated at high or low-altitudes.
(webmaster's note: 1984 - 1988 AMC Eagles all used the same engine management
package, so all information here should be applicable to all 1984 - 1988 AMC
Eagles. Webmaster makes no warranties about the accuracy of this information,
standard disclaimers apply. If you get hurt or damange your car, it's not my
fault. Be careful out there! Proceed at your own risk, etc.)
When necessary, perform the engine adjustments outlined in the Adjustment Procedures portion of this I.S. Note. In addition, any Eagle model that is so adjusted must have a unique Emission Control Information Update label installed. The part numbers for these unique labels are provided in the following Adjustment Procedures.
The adjustment procedures and unique labels must be made available at no cost to independent repair facilities and the general public. A notification is also provided in current owner's manuals to make customers aware of these adjustments. The Emission Control Information Update labels and technical information are available through the Milwaukee National Parts Distribution Center.
ADJUSTMENT PROCEDURES
On the above 1984 Eagle six-cylinder and four-cylinder models originally certified for operation at altitudes below 4,000 feet that are being operated above 4,000 feet, the ignition timing must be advanced 7" and engine idle speed reset. In addition, a jumper wire must be added to the MCU circuit to activate the altitude compensating circuit in the MCU.
1. Move the carpeting away from the passenger front seat toeboard to
expose the MCU harness.
2. Untape the two-terminal connector from the MCU harness.
3. Connect jumper wire, 318 6890, to the two-terminal connector and reinstall the carpet.
4. Advance ignition timing 7" from the setting indicated on the original Vehicle
Emission Control Information label in the engine compartment and reset engine idle speed
to the setting indicated on the same label.
5. Install Vehicle Emission Control Information Update label, part number 8983 100 009,
next to the original label.
These adjustments apply to the indicated 1984 AMC six-cylinder automatic and four-cylinder manual/automatic models originally certified for principal use at altitudes below 4,000 feet. Refer to the Vehicle Emission Control Information label to identify these vehicles.
NOTE: Whenever these vehicles are returned' to operation at altitudes below 4,000 feet, the MCU circuit jumper wire must be removed, the ignition timing and engine idle speed must be reset to original specifications and the Vehicle Emission Control information Update label removed.
On 1984 Eagle six-cylinder automatic and four-cylinder manual and automatic models originally certified for operation at altitudes above 4,000 feet that are being operated below 4,000 feet, the ignition timing should be retarded 7 " and engine idle reset. In addition, the MCU circuit jumper wire must be disconnected and taped to the MCU harness.
1. Move the carpeting away from the passenger front seat toeboard to
expose the MCU harness.
2. Disconnect the jumper wire from the two-terminal connector in the MCU harness
and tape
the connector securely to the harness.
3. Retard ignition timing 7" from the setting indicated on the original Vehicle
Emission Control label in the engine compartment and reset engine idle speed to the
setting indicated on this same label.
4. Install Vehicle Control Information Update label, part number 8983 100 OtO, next to the
original label.
These adjustments apply to 1984 Eagle six-cylinder automatic and four-cylinder manual/automatic models that were originally certified for principal use at altitudes above 4,000 feet. Refer to the Vehicle Emission Control Information label~ in the engine compartment to identify these vehicles.
NOTE: Whenever these vehicles are returned to operation at altitudes above 4,000 feet, the MCU circuit jumper wire must be reconnected, the ignition timing and engine~ idle speed must be reset to original specifications and the Vehicle Emission Control Information Update label removed.
On 1984 Eagle six-cylinder manual transmission models originally certified for operation
at altitudes below 4,000 feet that are being operated above 4,000 feet, the ignition
timing must be advanced 7", engine idle speed reset, and a jumper wire added to the
MCU circuit. In addition, the idle/decel switch must be connected to the carburetor EGR
port instead of the spark port.
1. Move the carpeting away from the passenger front seat toeboard
t-o expose the MCU harness.
2. Untape the two-terminal connector from the MCU harness.
3. Connect jumper wire 318 6890 to the two-terminal connector and reinstall the carpet.
4. Connect the idle / decel switch to the carburetor EGR port as follows (Fig. 1).
a. Disconnect vacuum line 1 from idle / decel switch and from tee connector 2 (Pig. 1).
Place this line in the glovebox -- do not discard it.
b. Install cap 813 2325 over the open end of tee connector 2.
c. Cut and install tee connector 321 0891 in vacuum line 3 (Fig. 1). Position the
connector about
1-114 inches from the EGR-CTO end of the line.
d. Connect 75-inch long vacuum line 4 to the idle / decel switch and to the tee connector in
line 3
6. Install Vehicle Emission Control Information Update label, 8983 100 009, next to the
original label.
These adjustments apply to 1984 Eagle six-cylinder manual
transmission models originally certified for use at altitudes below 4,000 feet. Refer to
the original Vehicle Emission Control Information label to identify these vehicles.
1. IDLE/DECEL SWITCH·TO·SPARK PORT VACUUM LINE (REMOVE AND PLACE
IN GLOVEBOX).
2. SPARK PORT VACUUM LINE TEE CONNECTOR (USE CAP 8132325 TO PLUG CONNECTOR AFTER REMOVING
LINE 1).
3. EGR PORT·TO·EGR·CTO VACUUM LINE (INSTALL TEE CONNECTOR 3210891 IN THIS LINE A80UT
1·114 INCHES FROM EGR·CTO END OF LINE).
4. 75 INCH LINE, 118 INSIDE DIAMETER VACUUM LINE USED TO RECONNECT IDLE/DECEL SWITCH TO
EC3R PORT 5 OllA TEE CONNECTOR IN LINE 3).
5. CARBURETOR EGR PORT (E).
6. CARBURETOR SPARK PORT(S).
NOTE: Whenever these vehicles are returned to operation at altitudes below 4,000 feet, the MCU jumper wire must be removed, the idle/decel switch reconnected to the carburetor spark port, the ignition timing and idle speed reset to original specifications, and the Vehicle Emission Control Update label removed.
On 1984 Eagle six-cylinder manual transmission models originally certified for operation at altitudes above 4,000 feet that are being operated below 4,000 feet, the ignition timing must be retarded 7", engine idle speed reset, and the MCU jumper wire removed. In addition, the idle switch must be connected to the carburetor spark port instead of the EGR port.
1. Move the carpeting away from the passenger front seat toeboard to
expose the MCU harness.
2. Disconnect the jumper wire from the two-terminal connector in the MCU harness and tape
the connector securely to the harness. Place the jumper wire in the glove box -- do not
discard it.
3. Reinstall the carpeting.
4. Connect the idle/decel switch to the carburetor spark port as
follows (Fig 2).
a. Cut and install tee connector 321 0891 in vacuum line 1. Position the connector about
1-1/4
inches from the spark port end of the line.
b. Disconnect vacuum Iine 2 from tee connector 3. Then reconnect Iine 2 to the tee
connector just
installed in vacuum line 1.
c. Plug open end of tee connector 3 with cap 813 2325.
5. Retard ignition timing 7" from the setting specified on the original Vehicle
Emission Control
Information label and reset idle speed to the setting on the same label.
6. Install Vehicle Emission Control Information Update label, 8983 100 010, next to the
original label.
1. SPARK PORT·TOICAN(STER PU RG E SIG NAL VACUUM
LINE (INSTALL TEE CONNECTOR 321b891 IN THIS LINE
ABOUT 1·114 INCH FROM SPARK PORT END OF LINE).
2. IDLE / DECEL SWITCH TO·EGR PORT VACUUM LINE
(DISCONNECT FROM TEE CONNECTOR 3 AND RECONNECT TO TEE CONNECTOR JUST INSTALLED
IN LINE 1.
3. EGR PORT TO·EGR·CTO VACUUM LINE TEE
CQNNECTOR (PLUG OPEN END WITH CAP 8132325
AFTER DISCONNECTING HOSE 2).~. CARBURETOR EGR PORT (E).
s. CARBURETOR SPARK PORT(S).
These adjustments apply to 1984 Eagle six-cylinder manual transmission models originally
certified for use at altitudes above 4,000 feet. Refer to the original Vehicle Emission
Control Information label to identify these vehicles.
NOTE: Whenever these vehicles are returned to operation at altitudes above 4,000 feet, the MCU jumper wire must be reinstalled, the idle / decel switch reconnected to the EGR port, the ignition timing and idle speed reset, and the Vehicle Emission Control information Update label removed.
Filing Instructions:
File this I.S. Note in the plastic binder supplied with your M.R. 251 manual.
Copyright O 1983 American Motors Corporation. All Rights Reserved Litho in U.S.A.
