NO.21 ENGINE NOISE [AJ (3.0L Duratec)]

id0103a7802700

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 belts)
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:
• Exhaust system looseness
• Dynamic dumper looseness
• Intake-air system looseness
Other noise:
• Camshaft friction gear noise or HLA noise

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1
• Is squeal, click or chirp sound present?
Yes
Inspect for the following.
• Engine oil level
• Drive belt tension
• Splash shield or under cover looseness
• Generator installation (alignment)
No
Go to the next step.
2
• Is rumble or grind sound present?
Yes
Inspect drive belt or P/S fluid level.
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 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 looseness for the following:
• Dynamic damper
• Intake-air system
• Exhaust system
No
Go to the next step.
6
• Is knock sound present?
Yes
Go to symptom troubleshooting "No.13 Knocking/pinging".
No
If noise comes from engine internal, inspect for friction gear or HLA noise.
7
• Verify test results.
- If okay, 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 PCM.