Installer Tech Tip: Engine Knocking Noise Just Above Idle on Nissan VG33E May Be Normal - Engine Builder Magazine
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Installer Tech Tip: Engine Knocking Noise Just Above Idle on Nissan VG33E May Be Normal

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If your customer complains of an engine knock just above idle from your rebuilt Nissan VG33E engine, you can tell them that the cause may be a normal pulsating noise coming from the EVAP purge
solenoid valve and piping (in the engine compartment) transferring into
the passenger cabin. However, use the following procedure to reduce the
noise.

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Service Procedure:

1. Start and run the engine for at least one minute.

2. Use CONSULT-II to view the status of the “Closed Throttle Position Switch” (CTPS).

3. Set the Parking Brake, then perform the following;

• For vehicles with an automatic transmission, with your foot on the brake, place the A/T gear selector in “D.”

 

• For vehicles with a manual transmission, depress the clutch and select any gear.

4. While viewing CTPS status, open the throttle just enough to change the CTPS status from “On” to “Off.”

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Note: This will allow the EVAP purge volume control solenoid valve to begin operating.

5. Listen closely for a slight “knocking” noise. If “knocking” noise is heard;

 

a. Put the transmission in “neutral” (M/T) or “park” (A/T).

 

b. Disconnect the electrical connector to the EVAP purge volume control solenoid valve. See Fig. 1.

figure 1

c. Listen again for the “knocking” noise by repeating steps 3, 4 and 5.

 


If the “knocking” noise is still heard, this service bulletin does not
apply. Consult the appropriate service manual for further diagnosis.
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• If “knocking” noise is not heard, shut off the engine and proceed to step 6.

6. Remove the hose clamps from the EVAP purge hose. See Fig. 2.

figure 2

7. Remove the EVAP purge hose. See Fig. 2.

Note: Set aside the two purge hose clamps for use in step 8.

8. Install a vacuum tank and hose kit (P/N 14958-5S625). See Fig. 3.

Figure 3

Note: Use the hose clamps set aside in step 7 to secure the replacement parts.

9. Reconnect the electrical connector to the EVAP purge volume control solenoid valve. See Fig. 1.

10. Repeat steps 3, 4 and 5 to verify the slight “knocking” noise is gone.

Technical service bulletin courtesy of Mitchell 1.

For additional information, visit www.mitchell1.com.

 

 

 

 

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