NO.20 ENGINE NOISE [F2]

id010394851300

20

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

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Is a squealing, click or chirping sound present?
Yes
Inspect for following:
•  Engine oil
•  Drive belt
No
Go to the next step.
2
Is a rumbling or grinding sound present?
Yes
Inspect drive belt.
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 Exhaust system for looseness:
No
Go to the next step.
6
Is a knocking sound present?
Yes
Go to symptom troubleshooting "No.12 Knocking/pinging".
No
If noise comes from inside engine, inspect for friction gear 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 the PCM.