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NO.21 ENGINE NOISE [Z6]
NO.21 ENGINE NOISE [Z6]
B3E010318881W54
21
ENGINE NOISE
DESCRIPTION
Engine noise from under hood
POSSIBLE CAUSE
Squeal, click or chirp noise:
• Improper engine oil level
• Improper drive belt tension
• Generator installation (alignment)
• Splash shield or under cover looseness (splashed water to drive belt)
Rattle sound noise:
• Loose parts
Hiss sound noise:
• Vacuum leakage
• Loose spark plug
• Air leakage from intake-air system
Rumble or grind noise:
• Improper drive belt tension
• Improper P/S fluid level
Rap or roar sound noise:
• Dynamic damper looseness
• Exhaust system looseness
• Intake-air system looseness
Other noise:
• Camshaft friction gear noise or MLA noise
• Timing chain noise
Diagnostic procedure
STEP
INSPECTION
RESULTS
ACTION
1
Is a squealing, click or chirping sound present?
Yes
Inspect for following:
• Engine oil
• Drive belt tension
• Splash shield or under cover looseness
• Generator installation (alignment)
No
Go to the next step.
2
Is a rumbling or grinding sound present?
Yes
Inspect drive belts.
No
Go to the next step.
3
Is a rattling sound present?
Yes
Inspect rattling location for loose parts.
No
Go to the next step.
4
Is a hissing sound present?
Yes
Inspect for the following:
• Vacuum leakage
• Spark plug looseness
• Intake-air system leakage
No
Go to the next step.
5
Is a rapping or roaring sound present?
Yes
Inspect the following for looseness:
• Dynamic chamber
• Intake-air system
• Exhaust system
No
Go to the next step.
6
Is a knocking sound present?
Yes
Go to symptom troubleshooting "No.11 Knocking/pinging".
(See NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [Z6].)
No
If noise comes from engine internal, inspect for friction gear, timing chain or MLA noise.
7
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [Z6].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [Z6].)
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