Jeep 1987 Wrangler Workshop Manual page 1089

NOTE: This will give access to the MCU
harness (D), the two-terminal connector (E), and
the jumper wire (F).
8. Remove the jumper wire (F) from the two-
terminal connector (E).
103826
NOTE: DO NOT DISCARD THE JUMPER
WIRE. Place the jumper wire in the glove com-
partment for reinstallation when the vehicle is
returned to use at ABOVE 4,000 feet.
9. Tape the two-terminal connector to the MCU
harness.
10. Install the radio.
11. Install the radio bezel.
12. Connect the battery ground cable.
13. Set the ignition timing to 9° BTDC.
14. Reset the idle speed to the setting specified
on the original Vehicle Emission Control
Information lable.
15. Attach the Vehicle Emission Control
Information Update label, P/N E F 8980 010
601. Position the Update label next to the
original label.
NOTE: Whenever this vehicle is returned to
operation ABOVE 4,000 feet, reconnect the
MCU jumper wire, reset the ignition timing to
16° BTDC, reset the idle speeds to the original
specifications, and, remove the Vehicle
Emission Control Information Update labe.
Vehicles With 4.21 Engines and Manual
Transmissions Built for Operation BELOW 4
9
000
Feet-Now Being Operated Above 4,008 Feet
1. Open the hood and support with the rod.
2. Check the Vehicle Emission Control
Information label (A) located on the
underside at the front of the hood.
A
103821
3. Locate positions (1) (2) (3) and (4).
4. Verify that the vehicle is equipped as follows:
1. 4.2L Engine (258 cu. in.)
2. 49-State/California/Canada
3. For Operation BELOW 4,000 Feet
4. Manual Transmission
5. Disconnect the battery ground cable.
16. Stow the support rod and close the hood.
5