Cherokee 4WD V6-173 2.8L VIN W 2-bbl (1985)
Fig. 1 Modifying Low Altitude Model for High Altitude Operation
Figure 1 Modifying Low Altitude Model for High Altitude Operation
On 1985 Eagle/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 jumper wire removed. In addition, the
idle/decel 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 twoterminal 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.
