A.Carburetor Feedback System Testing

Figure 1:

1. Remove air cleaner assembly and plug vacuum hose or tee leading to it.

2. Clean the outside of the carburetor and the choke linkage with MOPAR Brake and Carburetor Parts Cleaner, PN 4318037, or equivalent.

Figure 1:

3. Clean the Primary Air Bleed Jet, Secondary Air Bleed Jet, and Choke Shaft (Figure 1).

Figure 2:

4. Using a digital Volt-Ohm meter, connect the positive lead to the Oxygen Sensor Check terminal (Figure 2). Connect the negative lead to a good ground on the engine block. Turn the ignition on. The meter should show a positive voltage reading.

NOTE: The Oxygen Sensor Check terminal has two electrical contacts. Connect the positive lead of the volt-ohm meter to the contact with the shielded wire. If the voltmeter reads zero volts connect the positive lead to the other contact and recheck.

5. Connect a tachometer to the engine.

6. Start the engine and warm it up to normal operating temperature.

Note: Steps 7 and 8 supersede the procedure shown in the videotape for this recall.

7. Run the engine at 2500 RPM in neutral for 20 seconds and record the maximum and minimum oxygen sensor voltage.

NOTE: The oxygen sensor voltage will vary continuously. Note only the highest and lowest voltage observed.

Figure 3:

8. If the difference between the maximum and minimum oxygen sensor voltage is less than 0.2 volts, replace the Jet Mixture Solenoid Valve as follows:

a. Disconnect the solenold valve connector.

b. Remove the Jet Mixture Solenoid Valve (Figure 3).

c. Install the new Jet Mixture Solenoid Valve (P/N MD612014) and tighten to 2.2 ft.lbs. (2.9 N-m).

NOTE: Do not over tighten the Jet Mixture Solenoid Valve since this will distort the valve and cause an over rich condition.

9. Run the engine at 2500 RPM in neutral for 20 seconds and recheck maximum oxygen sensor voltage at 2500 RPM.

10. If the maximum oxygen sensor voltage is less than 0.6 volts, you will be instructed to replace the oxygen sensor later in this procedure after the engine has cooled down (Reference step G).

11. Remove the volt-ohm meter and tachometer.