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Fuel Injection
Valves
1. Verify the operation of each injection
valve by disconnecting the electrical
supply to each injection valve, one at a
time and determine if the engine speed
drops when the valve is disconnected.
2. If the speed drops, the valve is
defective.
3. Measure the resistance of the coil of
each injection valve. Should be 2-3
ohms.
Fuel Pressure
Verify the fuel pressure is correct.
Air Flow
Sensor
Verify the air flow sensor is functioning
properly.
Temperature
Sensor II
1. Measure the output of the
temperature sender unit under various
conditions. Following values should be
used for reference purposes, but the
value may be different due to the age
of the sensor.
Temperature Range Value
68
0
F 2k – 3k ohms
14
0
F 7.5k – 12k ohms
176
0
F 250 – 400 ohms
Note (1): Activated charcoal filter hose must be disconnected at air cleaner, the
air injection hose must be removed and the check valve must be plugged. The
adjustments should be made as quickly as possible to prevent excessive heat in
intake lines.
ACCELERATION NOT SMOOTH
Possible Problem Procedure
Throttle Valve
Switch
1. Verify function of throttle valve.
Air Intake
System
1. The air intake system must be free
of leaks. Check the intake manifold,
hoses and associate components with
soapy water to determine if leaks are
occurring.
Auxiliary Air Device
1. Verify function of auxiliary air device.
Air Flow Sensor
1. Verify function of air flow sensor.
Exhaust Gas Mixture
1. If the concentration is too high,
adjust the bypass screw in the air flow
sensor ½ turn counterclockwise and
measure again.