Jeep 1987 Wrangler Workshop Manual page 1159

On 1986 Eagie/Jeep, 49-State/California/
Canada 4.2L models with manual transmission
originally sold 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 ground
wire removed. In addition, the idle/decel switch
must be connected to the carburetor spark port
instead of the EGR port.
1. On Eagle models, move the carpeting away
from the passenger side front toeboard to ex-
pose the MCU harness. Disconnect the
jumper wire from the two-terminal connector
in the MCU harness and tape the connector
securely to the harness. Then place the
jumper wire in the glove box.
2. On Jeep models, disconnect the black with
tracer altitude circuit ground wire from the
engine. Cover the ground wire eyelet with tape
and secure the wire to the MCU harness with
tape or a tie strap.
3. 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 (Fig. 2). Position the
connector about 1 VA inches from the spark
port end of the line.
b. Disconnect vacuum line line 2 from tee
connector 3. Then reconnect line 2 to the
tee connector just installed in vacuum line
1 (Fig. 2).
c. Plug open end of tee connector 3 with cap
813 2325.
4. 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.
5. Install Vehicle Emission Control Information
Update label, E F 8980 000 819, next to the
original label.
These adjustments apply to 1986 AMC/Jeep,
49-State/California/Canada 4 2L models with
manual transmission originally sold 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 ground wire must be reinstall-
ed, 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.
6. 1986 GRAND WAGONEER/TRUCK 6 J L
ENGINES
On 1986 Grand Wagoneer/Truck, 49-State/
California/Canada 5.9L models originally sold
for operation at altitudes below 4,000 feet that
are being operated above 4,000 feet, the ignition
timing a s shown on the original Vehicle
Emission Control Information label in the engine
compartment, should be advanced 7° and
engine idle speed reset to the specifications
indicated on this same label.
1. Advance ignition timing 7° from the setting
indicated on the original Vehicle Emission
Control Information label and reset engine
idle speed to the setting indicated on the
same label.
2. Install Vehicle Emission Control Information
Update label, part number E F 8980 000 818,
next to the original label.
These adjustments apply to 1986 Grand
Wagoneer/Truck, 49-State/California/Canada
5.9L V-8 models originally sold for principal use
at altitudes below 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 below 4,000
feet, the ignition timing and engine idle
s p e e d must be reset to original
specifications and the Vehicle Emission
Control Information Update label
removed.
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