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NO.21 ENGINE NOISE [AJ]

BME010300103226

21 | Engine noise
DESCRIPTION | • Engine noise from under hood
POSSIBLE CAUSE | Squeal, click or chirp noise: • Improper engine oil level • Improper drive belt tension 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
Rap or roar sound noise:
• Exhaust system looseness
Other noise:
• Camshaft friction gear noise or HLA noise

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Is squeal, click or chirp sound present? | Yes | Inspect the engine oil level or the drive belts.
No | Go to the next step.
2 | • Is rumble or grind sound present? | Yes | Inspect the drive belt.
No | Go to the next step.
3 | • Is rattle sound present? | Yes | Inspect location of rattle for loose parts.
No | Go to the next step.
4 | • Is hiss sound present? | Yes | Inspect for the following: • Vacuum leakage • Spark plug loose • Intake-air system leakage
No | Go to the next step.
5 | • Is rap or roar sound present? | Yes | Inspect the exhaust system for loose parts.
No | Go to the next step.
6 | • Is knock sound present? | Yes | Go to symptom troubleshooting "No.13 Knocking/ pinging". (See NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [AJ].)
No | If noise comes from engine internal, inspect for friction gear or HLA noise.
7 | • Verify test results.

  - If normal, return to diagnostic index to service any additional symptoms.
  - If malfunction remains, inspect related Service Information and perform repair or diagnosis.

  • If vehicle is repaired, troubleshooting completed.
  • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram the PCM.