Cherokee 2WD L4-126 2.1L DSL Turbo VIN B FI (1986)
1.
Retard ignition timing 7~ from the setting indicated on the original Vehicle Emission Control label and reset engine idle speed to the setting
indicated on this same label.
2.
Install Vehicle Emission Control Information Update label, part number EF 8980 000 819, next to the original label.
This adjustment applies to 1986 Cherokee/ Wagoneer/Comanche, 49-State and Canada 2.8L models that were originally sold 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 ignition timing and engine idle speed must be reset to
original specifications and the Vehicle Emission Control Information Update label removed.
3.
1986 CJ 2.46L CARBURETOR EQUIPPED ENGINES
1986, 2.46L carburetor equipped engines in California/49-State/Canada CJ models require adjustment as outlined below.
Adjustment - California/49-State/Canada Carburetor Equipped 2.46L Engines
On 1986 California/49-State/Canada models, with a carburetor equipped 2.46L engine, originally sold for operation at altitudes below 4,000 feet that are
being operated above 4,000 feet, the ignition timing as 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. In addition, a ground wire must be connected to the
MCU circuit to activate the altitude compensating circuit in the MCU.
1.
Locate the black with tracer altitude circuit ground wire. The wire is in the MCU harness. It is located near the ignition coil, or at the rear-center of
the engine compartment between the dash panel and air cleaner.
2.
Remove the tape from the eyelet attached to the end of the ground wire.
3.
Connect the ground wire eyelet to a convenient ground location on the engine.
4.
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.
5.
Install Vehicle Emission Control Information Update label, part number EF 8980 000 818, next to the original label.
This adjustment applies to 1986 CJ California/ 49-State/Canada models, with a carburetor equipped 2.46L engine, 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 MCU circuit jumper wire must be removed, the ignition
timing and engine idle speed reset to original specifications and the Vehicle Emission Control Information Update label removed.
On 1986, California/49-State/Canada CJ models with a 2.46L carburetor equipped engine, originally sold for use at altitudes above 4,000 feet that are
being operated below 4,000 feet, the ignition timing, as shown on the original Vehicle Emission Control Information label in the engine compartment
should be retarded 7~ and engine idle reset to the specification indicated on this label. In addition, the MCU circuit ground wire must be disconnected
and taped to the MCU harness.
1.
Disconnect the black with tracer altitude circuit ground wire from the engine.
2.
Cover the connector eyelet with tape and secure the wire to the MCU harness with tape or a tie strap.
3.
Retard ignition timing 7~ from the setting indicated on the original Vehicle Emission Control label and reset engine idle speed to the setting
indicated on this same label.
4.
Install Vehicle Emission Control Information Update label, part number EF 8980 000 819, next to the original label.
This adjustment applies to the 1986 California/ 49-State/Canada CJ models, with a carburetor equipped 2.46L engine, that were originally sold 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 reset to original specifications, and the Vehicle Emission Control Information Update label removed.
4.
1986 EAGLE/CJ/GRAND WAGONEER/TRUCK 4.2L ENGINES
1986 Eagle/Jeep 49-State and California/ Canada 4.2L engines require adjustment. However, the adjustment procedures for models with automatic or
manual transmission are different. Refer to the following procedures.
Adjustment - 49-State/California/Canada 4.2L Models With Automatic Transmission
