NO.21 ENGINE NOISE [L3 Turbo]
id0103b4802700
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21 |
ENGINE NOISE |
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DESCRIPTION
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Engine noise under hood
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POSSIBLE CAUSE
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Squeal, click or chirp noise:
• Improper engine oil level
• Loose installation of solenoid valves
• Improper drive belt tension
Rumble or grinding sound noise:
• Loose parts
• Fluid revel low or air in power the steering fluid
• Improper drive belt tension
Hiss sound noise:
• Vacuum leakage
• Loose spark plug
• Air leakage from the intake-air system
Rattle noise:
• Loose parts
Rap or roar noise:
• Exhaust system looseness
Excessive noise from turbocharger:
• Foreign objects or material in the compressor inlet to the intake manifold ducting or the compressor housing
• Carbon built-up in the turbine housing
• Turbocharger routing assembly banding or dragging
• Loose intake or exhaust ducting systems
Other noise:
• Camshaft friction gear noise or MLA noise
• Timing chain noise
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Diagnostic procedure
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STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Is the noise from the turbocharger?
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Yes
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Go to Step 8.
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No
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Go to the next step
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2
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Is squeal, click or chirp sound present?
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Yes
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Inspect the engine oil level, solenoid valves installation or drive belt tension.
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No
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Go to the next step.
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3
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Is rumble or grinding sound present?
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Yes
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Inspect and repair the following;
• Drive belt tension
• Loose parts in engine compartment
• Power steering system fluid level
If normal, perform the power steering fluid line air bleed.
(SeeAIR BLEEDING.)
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No
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Go to the next step.
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4
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Is rattle sound present?
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Yes
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Inspect the location of rattle for loose parts.
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No
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Go to the next step.
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5
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Is hiss sound present?
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Yes
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Inspect and repair the following;
• Vacuum leakage
• Spark plug looseness
• Intake-air system leakage
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No
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Go to the next step.
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6
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Is rap or roar sound present?
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Yes
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Inspect the exhaust system or loose parts.
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No
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Go to the next step.
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7
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Is knocking noise present?
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Yes
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Go to symptom troubleshooting “NO.13 KNOCKING/PINGING”.
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No
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If noise comes from engine internal, inspect for the friction gear, timing chain or MLA noise.
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8
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Inspect the intake and exhaust housing system for loose installation.
Is there any problem found?
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Yes
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Repair installation or replace suspected part.
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No
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Go to the next step.
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9
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Remove the parts necessary to inspect turbocharger without removing the turbocharger.
Inspect if turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle.
Is there any problem?
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Yes
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Replace the turbocharger.
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No
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Go to the next step.
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10
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Inspect the turbocharger compressor wheel locknut is loose or has fallen down inside turbocharger.
Is there any problem?
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Yes
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Replace the turbocharger.
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No
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Go to the next step.
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11
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Turn the turbocharger compressor wheel by hand.
Does the wheel turn easily and smoothly?
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Yes
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Go to the next step.
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No
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Replace the turbocharger.
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12
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Visually inspect the turbine housing.
Is there any carbon built-up or foreign material on turbine housing?
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Yes
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Clean built-up carbon or remove foreign materials.
If turbine housing damaged, replace the turbocharger.
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No
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Install the removal parts at Step 9, and inspect all turbocharger related parts installed correctly.
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13
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Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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