NO.21 ENGINE NOISE [L5]

NO.21 ENGINE NOISE [L5]SM2444481

id0103a8802700

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 mis-installation • Splash shield or under cover looseness (splashed water to drive belts) Rumble or grind noise: • Improper drive belt tension • Loose parts • Fluid revel low or air in power steering fluid Rattle sound noise: • Loose parts Hiss sound noise: • Air leakage from intake air system • Loose spark plug • Vacuum leakage Rap or roar noise: • Dynamic dumper looseness • Exhaust system looseness • Intake air system looseness Other noise: • Tappet noise • Timing chain noise

ENGINE NOISE

DESCRIPTION

• Engine noise from under hood.

POSSIBLE CAUSE

Squeal, click or chirp noise:

• Improper engine oil level

• Improper drive belt tension

• Generator mis-installation

• Splash shield or under cover looseness (splashed water to drive belts)

Rumble or grind noise:

• Improper drive belt tension

• Loose parts

• Fluid revel low or air in power steering fluid

Rattle sound noise:

• Loose parts

Hiss sound noise:

• Air leakage from intake air system

• Loose spark plug

• Vacuum leakage

Rap or roar noise:

• Dynamic dumper looseness

• Exhaust system looseness

• Intake air system looseness

Other noise:

• Tappet noise

• Timing chain noise

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	Is a squealing, click or chirping sound present?	Yes	Inspect the following: • Engine oil level • Drive belt tension • Generator installation • Splash shield or under cover looseness Repair or replace the malfunctioning part according to the inspection results.
1	Is a squealing, click or chirping sound present?	No	Go to the next step.
2	Is a rumbling or grinding noise present?	Yes	Inspect the following: • Drive belt tension (See DRIVE BELT INSPECTION [L5].) • Loose parts in engine compartment • Power steering system fluid revel ― If there is no malfunction: • Perform the power steering fluid line air bleed. (See AIR BLEEDING [L3 Turbo, L5].) ― If there is a malfunction: • Repair or replace the malfunctioning part according to the inspection results.
2	Is a rumbling or grinding noise present?	No	Go to the next step.
3	Is a rattling noise present?	Yes	Inspect the rattling location for loose parts. Repair or replace the malfunctioning part according to the inspection results.
3	Is a rattling noise present?	No	Go to the next step.
4	Is a hissing noise present?	Yes	Inspect the following: • Intake air system leakage • Spark plug looseness • Vacuum leakage Repair or replace the malfunctioning part according to the inspection results.
4	Is a hissing noise present?	No	Go to the next step.
5	Is a rapping or roar noise present?	Yes	Inspect for looseness in the following: • Dynamic dumper • Exhaust system • Intake air system Repair or replace the malfunctioning part according to the inspection results.
5	Is a rapping or roar noise present?	No	Go to the next step.
6	Is a knocking noise present?	Yes	Go to the symptom troubleshooting “NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE”. (See NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [L5].)
6	Is a knocking noise present?	No	If the noise comes from inside the engine: • Inspect the tappet noise. • Repair or replace the malfunctioning part according to the inspection results.
7	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5].) • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.