LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 594 (Engine Mechanical - 3.4L) >> Diagnostic Information and Procedures >> Drive Belt Rumbling Diagnosis >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2:  This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom.
  2. 3:  This test is to verify that the drive belt(s) is causing the rumbling noise. Rumbling noise may be confused with an internal engine noise due to the similarity in the description. Remove only one drive belt at a time if the vehicle has multiple drive belts. When removing the drive belt the water pump may not be operating and the engine may overheat. Also DTCs may set when the engine is operating with the drive belt removed.
  3. 4:  Inspecting the drive belt(s) is to ensure that it is not causing a the noise. Small cracks across the ribs of the drive belt will not cause the noise. Belt separation is identified by the plys of the belt separating and may be seen at the edge of the belt our felt as a lump in the belt.
  4. 5:  Small amounts of pilling is normal condition and acceptable. When the pilling is severe the drive belt does not have a smooth surface for proper operation.
Drive Belt Rumbling Diagnosis

Step Action Yes No
NOTE: Refer to Belt Dressing Notice in Cautions and Notices.
DEFINITION:
  • A low pitch tapping, knocking, or thumping noise heard at or just above idle.
  • Heard once per revolution of the drive belt or a pulley.
  • Rumbling may be caused from:
    • Pilling, the accumulation of rubber dust that forms small balls (pills) or strings in the drive belt pulley groove
    • The separation of the drive belt
    • A damaged drive belt
1 Did you review the Symptoms - Engine Mechanical operation and perform the necessary inspections? Go to Step 2  Go to Symptoms - Engine Mechanical 
2  Verify that there is a rumbling noise.
Does the engine make the rumbling noise?		 Go to Step 3  Go to Diagnostic Aids
3 
  1. Remove the drive belt. Refer to Drive Belt Replacement .
  2. Operate the engine for no longer than 30 to 40 seconds.
Does the rumbling noise still exist?		 Go to Engine Noise on Start-Up, but Only Lasting a Few Seconds , Upper Engine Noise, Regardless of Engine Speed , Lower Engine Noise, Regardless of Engine Speed , or Engine Noise Under Load  Go to Step 4 
4  Inspect the drive belt(s) for damage, separation, or sections of missing ribs.
Did you find any of these conditions?		 Go to Step 7  Go to Step 5 
5  Inspect for severe pilling of more than 1/3 of the drive belt pulley grooves.
Did you find severe pilling?		 Go to Step 6  Go to Step 7 
6
  1. Clean the drive belt pulleys using a suitable wire brush.
  2. Reinstall the drive belt. Refer to Drive Belt Replacement .
Did you complete the repair?		 Go to Step 8  Go to Step 7 
7 Install a new drive belt. Refer to Drive Belt Replacement .
Did you complete the replacement?		 Go to Step 8  -
8 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Diagnostic Aids
scientia non olet · About LEMON Manuals