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1A-24
GENERAL SERVICE AND DIAGNOSIS
(1) Connect tachometer, start engine and warm to
normal operating temperature. Choke must be off.
(2) If not within OK range, turn curb idle adjust
ment screw to obtain specified curb idle rpm.
(3) Turn hex screw on solenoid carriage to obtain
specified idle rpm.
(a) Tighten locknut, if equipped.
(b) Disconnect solenoid wire connector and ad
just curb idle screw to obtain 500 rpm idle speed.
(c) Connect solenoid wire connector.
(d) If model 2150 carburetor is equipped with
dashpot: with throttle at curb idle position, fully depress
dashpot stem and measure clearance between stem and
throttle lever. Clearance should be 0.093 inch (2.36 mm).
Adjust by loosening locknut and turning dashpot.
Choke Linkage
Inspect all choke linkages, including the fast idle cam,
for free movement at the engine mileage interval speci
fied in the Engine Maintenance Schedule.
Clean choke linkage by applying Jeep Carburetor and
Combustion Area Cleaner, or equivalent. Never use oil
to lubricate choke linkage.
For choke circuit adjustment procedures, refer to
Chapter U—Fuel Systems.
PCV Air Inlet Filter
Four- and Six-Cylinder Engines
A polyester non-woven felt PCV air inlet filter is
located in a retainer inside the air cleaner. Rotate the
retainer to remove it from the air cleaner (fig. 1A-12).
Replace or clean the filter at the engine mileage interval
specified in the Engine Maintenance Schedule. Clean
with kerosene or detergent and water. Squeeze excess
liquid from filter. Do not wring or twist. After cleaning,
lightly oil the filter with clean engine lube oil.
MOULDED
HOSE
INLET
FILTER
43048
Rg. 1A-12 PCV Air Inlet Filter—Four- and Six-Cylinder Engines
Eight-Cylinder Engine
A PCV air inlet filter is located in the sealed oil filler
cap. To clean the filter, apply light air pressure in the
direction opposite normal air flow (through the filler
tube opening in the cap). Do not apply oil to the filter. If
the filter is deteriorated, replace the filler cap.
Fuel Tank Vapor Emission Control System
The fuel tank, filler cap,' fuel hoses and vent hoses
must be maintained in good condition to prevent raw
fuel vapor (hydrocarbons) from entering the
atmosphere.
Inspect the filler cap for evidence of fuel leakage
stains at the filler neck opening. Remove the cap and
examine the condition of the sealing gasket. Replace the
filler cap if the gasket is damaged or deteriorated.
Inspect the fuel tank for evidence of fuel leakage
stains. Trace stain to its origin and repair or replace the
tank as required.
Inspect the fuel and vent hoses for leakage or damage.
Repair or replace as required. Ensure all connections are
tight.
If liquid fuel is present in the fuel vapor storage canis
ter, inspect the liquid check valve and replace if
necessary.
Fuel Vapor Storage Canister Filter
The filter pad located at the bottom of the canister is
the only serviceable part of the canister assembly. Re
place at the interval specified in the Engine Mainte
nance Schedule.
Thermostatically Controlled Air Cleaner (TAC) System
Inspect the air valve in the air cleaner snorkel for
proper operation. If necessary, refer to Chapter
1J—Fuel Systems for functional test procedure.
Inspect hoses for cracks and brittleness. Replace as
necessary.
EXHAUST SYSTEMS
Air Injection Systems
Inspect hoses and hose connections for defects. Re
place as necessary. Refer to Chapter IK—Exhaust Sys
tems for system functional test procedures.
Exhaust Manifold Heat Valve—Eight-Cylinder Engine
The exhaust manifold heat valve is an often over
looked, but highly important, emission control related
device. This valve can affect the fuel economy, engine
performance and driveability, and cause excessive emis
sion of undesirable exhaust gases.
Inspect the valve (located in front exhaust pipe) for
correct operation and lubricate with Jeep Heat Valve
Lubricant, or equivalent. Refer to Chapter IK—Exhaust
Systems for additional service procedures.
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