NO.21 ENGINE NOISE[L3 Turbo]

21	ENGINE NOISE
DESCRIPTION	Engine noise under hood
POSSIBLE CAUSE	Squeal, click or chirp noise: • Improper engine oil level • Loose installation of solenoid valves • Improper drive belt tension Rumble or grinding sound noise: • Loose parts • Fluid revel low or air in power the steering fluid • Improper drive belt tension Hiss sound noise: • Vacuum leakage • Loose spark plug • Air leakage from the intake-air system Rattle noise: • Loose parts Rap or roar noise: • Exhaust system looseness Excessive noise from turbocharger • Foreign objects or material in the compressor inlet to the intake manifold ducting or the compressor housing • Carbon built-up in the turbine housing • Turbocharger routing assembly banding or dragging • Loose intake or exhaust ducting systems Other noise: • Camshaft friction gear noise or MLA noise • Timing chain noise Warning The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION[L3 Turbo].) (See AFTER SERVICE PRECAUTION[L3 Turbo].) Caution • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

ENGINE NOISE

DESCRIPTION

Engine noise under hood

POSSIBLE CAUSE

Squeal, click or chirp noise:

• Improper engine oil level

• Loose installation of solenoid valves

• Improper drive belt tension

Rumble or grinding sound noise:

• Loose parts

• Fluid revel low or air in power the steering fluid

• Improper drive belt tension

Hiss sound noise:

• Vacuum leakage

• Loose spark plug

• Air leakage from the intake-air system

Rattle noise:

• Loose parts

Rap or roar noise:

• Exhaust system looseness

Excessive noise from turbocharger

• Foreign objects or material in the compressor inlet to the intake manifold ducting or the compressor housing

• Carbon built-up in the turbine housing

• Turbocharger routing assembly banding or dragging

• Loose intake or exhaust ducting systems

Other noise:

• Camshaft friction gear noise or MLA noise

• Timing chain noise

Warning

The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:

• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual.

(See BEFORE SERVICE PRECAUTION[L3 Turbo].)

(See AFTER SERVICE PRECAUTION[L3 Turbo].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

STEP	INSPECTION	RESULTS	ACTION
1	Is the noise from the turbocharger?	Yes	Go to Step 8.
No	Go to the next step
2	Is squeal, click or chirp sound present?	Yes	Inspect the engine oil level, solenoid valves installation or drive belt tension.
No	Go to the next step.
3	Is rumble or grinding sound present?	Yes	Inspect and repair the following; • Drive belt tension • Loose parts in engine compartment • Power steering system fluid level If normal, perform the power steering fluid line air bleed.
No	Go to the next step.
4	Is rattle sound present?	Yes	Inspect the location of rattle for loose parts.
No	Go to the next step.
5	Is hiss sound present?	Yes	Inspect and repair the following; • Vacuum leakage • Spark plug looseness • Intake-air system leakage
No	Go to the next step.
6	Is rap or roar sound present?	Yes	Inspect the exhaust system or loose parts.
No	Go to the next step.
7	Is knocking noise present?	Yes	Go to symptom troubleshooting "NO.13 KNOCKING/PINGING". (See NO.13 KNOCKING/PINGING[L3 Turbo].)
No	If noise comes from engine internal, inspect for the friction gear, timing chain or MLA noise.
8	Inspect the intake and exhaust housing system for loose installation. Is there any problem found?	Yes	Repair installation or replace suspected part.
No	Go to the next step.
9	Remove the parts to necessary to inspect turbocharger without remove the turbocharger. Inspect if turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle. Is there any problem?	Yes	Replace the turbocharger.
No	Go to the next step.
10	Inspect the turbocharger compressor wheel locknut is loose or has fallen down inside turbocharger. Is there any problem?	Yes	Replace the turbocharger.
No	Go to the next step.
11	Turn the turbocharger compressor wheel by hand. Does the wheel turn easily and smoothly?	Yes	Go to the next step.
No	Replace the turbocharger.
12	Visually inspect the turbine housing. Is there any carbon built-up or foreign material on turbine housing?	Yes	Clean built-up carbon or remove foreign materials. If turbine housing damaged, replace the turbocharger.
No	Install the removal parts at Step 9, and inspect all turbocharger related parts installed correctly.
13	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair 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.

STEP

INSPECTION

RESULTS

ACTION

Is the noise from the turbocharger?

Yes

Go to Step 8.

Go to the next step

Is squeal, click or chirp sound present?

Yes

Inspect the engine oil level, solenoid valves installation or drive belt tension.

Go to the next step.

Is rumble or grinding sound present?

Yes

Inspect and repair the following;

• Drive belt tension

• Loose parts in engine compartment

• Power steering system fluid level

If normal, perform the power steering fluid line air bleed.

Go to the next step.

Is rattle sound present?

Yes

Inspect the location of rattle for loose parts.

Go to the next step.

Is hiss sound present?

Yes

Inspect and repair the following;

• Vacuum leakage

• Spark plug looseness

• Intake-air system leakage

Go to the next step.

Is rap or roar sound present?

Yes

Inspect the exhaust system or loose parts.

Go to the next step.

Is knocking noise present?

Yes

Go to symptom troubleshooting "NO.13 KNOCKING/PINGING".

(See NO.13 KNOCKING/PINGING[L3 Turbo].)

If noise comes from engine internal, inspect for the friction gear, timing chain or MLA noise.

Inspect the intake and exhaust housing system for loose installation.

Is there any problem found?

Yes

Repair installation or replace suspected part.

Go to the next step.

Remove the parts to necessary to inspect turbocharger without remove the turbocharger.

Inspect if turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle.

Is there any problem?

Yes

Replace the turbocharger.

Go to the next step.

Inspect the turbocharger compressor wheel locknut is loose or has fallen down inside turbocharger.

Is there any problem?

Yes

Replace the turbocharger.

Go to the next step.

Turn the turbocharger compressor wheel by hand.

Does the wheel turn easily and smoothly?

Yes

Go to the next step.

Replace the turbocharger.

Visually inspect the turbine housing.

Is there any carbon built-up or foreign material on turbine housing?

Yes

Clean built-up carbon or remove foreign materials.

If turbine housing damaged, replace the turbocharger.

Install the removal parts at Step 9, and inspect all turbocharger related parts installed correctly.

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair 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.