Cherokee 2WD L4-126 2.1L DSL Turbo VIN B FI (1986)
Fig. 1 Modifying Low Altitude Model for High Altitude Operation
Figure 1 Modifying Low Altitude Model for High Altitude Operation
On 1986 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 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 expose 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.
Fig. 2 - Modifying High Altitude Model for Low Altitude Operation
