TAPPING NOISE FROM ENGINE AT IDLE

Applicable Models

Model Starting S/N Ending S/N Model Spec
  MAZDA3 2004-2005   000000   ZZZZZZ  

Related Category/Subcategory/Symptoms

ENGINE / MECHANICAL / PINGING
ENGINE / MECHANICAL / UNUSUAL NOISE(EXCL. PINGING,SQUEAKING,OPERATION,RESONANCE)
ENGINE / FUEL / EXCESSIVE OPERATION NOISE
ENGINE / FUEL / RESONANCE NOISE
ENGINE / FUEL / UNUSUAL NOISE(EXCL. PINGING,SQUEAKING,OPERATION,RESONANCE)

MTOL - 4556 Dealer Repair Information

Symptom and Conditions

A tapping/clatter type noise might be heard from engine at operating temperature and when warm. The noise may come from the inside of the intake manifold.

To verify, close the Intake Manifold Tuning Valve (IMTV #) PID using WDS. The workshop manual calls this the variable intake-air shutter valve actuator. For procedure, see following instructions. If noise goes away with IMTV # = OFF, replace intake manifold assembly.

1. ID vehicle (Note - select "automatic" if A/T equipped, not ASM.) 2. Select TOOLBOX 3. Select DATALOGGER. Press Tick 4. Select POWERTRAIN 5. Select ENGINE. Press Tick 6. Select IMTV # PID. Press Tick 7. At Datalogger screen, select IMTV # 8. Press # button on right side of screen 9. Press button with icon showing hand. IMTV # changes to IMTV = 10. Press "-" button. IMTV changes from ON to OFF 11. Verify tapping/clatter noise stops with IMTV = OFF, then comes back with IMTV = ON, by toggling "+" and "-" buttons. 12. If verified, replace intake manifold assembly by following procedure outlined in WSM section 01-13, INTAKE-AIR SYSTEM.

Published in M-tips, May/June 2005 edition.
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