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11
ENGINE DOES NOT START (continued)
Air Flow
Sensor
1. Check the air-flow sensor function by removing the
connection on the back of the sensor. Connect an
ohmmeter to the following contacts to verify sensor.
Pins 6 and 9 200 – 400 ohms
Pins 7 and 8 120 – 200 ohms
Pins 6 and 27 2k Ohms at room temp (Temp Sensor)
Pins 36 and 39. With the flap closed the resistance
should be infinite. With the flap slightly open it should
drop to 0 ohms. This measurement is the fuel pump
contacts that engage after engine start to keep the
pump running.
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.
Note (1): This will not verify that the spray nozzle is atomizing the fuel.
ENGINE STARTS BUT THEN DIES
Possible Problem Procedure
Air Flow Sensor
Pump Contacts
Verify that the resistance between pins
36 and 39 of the Air Flow Sensor is
infinite when the flap is closed and
when the flap is opened, the resistance
goes to 0 ohms.
Cold Start
Valve
Verify that the cold start valve is not
leaking and is functioning properly
ROUGH ENGINE IDLE
Possible Problem Procedure
Throttle
Valve
1. Verify that the throttle valve is closed
and determine if it can be closed
further. If it can be closed further, then
listen for the engine speed to increase
and decrease.
2. Remove the throttle valve clamps.
3. Inspect for bent throttle linkage.
4. Reset the adjusting screw at the
throttle valve