NO.21 ENGINE NOISE [L3 Turbo]SM2444521
NO.21 ENGINE NOISE [L3 Turbo]

id0103b4802700

21

ENGINE NOISE
DESCRIPTION
• Engine noise from 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.

Diagnostic procedure

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.
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
3
Is rumble or grinding sound present?
Yes
Inspect for 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. (See AIR BLEEDING [L3 Turbo, L5].)
• If not:
― Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
4
Is rattle sound present?
Yes
Inspect the location of rattle for loose parts.
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
5
Is hiss sound present?
Yes
Inspect for the following:
• Vacuum leakage
• Spark plug looseness
• Intake-air system leakage
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
6
Is rap or roar sound present?
Yes
Inspect the exhaust system or loose parts.
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
7
Is knocking noise present?
Yes
Perform the 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.
• Repair or replace the malfunctioning part according to the inspection results.
8
Inspect the intake and exhaust housing system for loose installation.
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
9
Remove the parts necessary to inspect the turbocharger without removing the turbocharger.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
Inspect if the turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle.
(See TURBOCHARGER INSPECTION [L3 Turbo].)
Is there any malfunction?
Yes
Replace the turbocharger.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
10
Inspect the turbocharger compressor wheel locknut is loose or has fallen down inside the turbocharger.
Is there any malfunction?
Yes
Replace the turbocharger.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
11
Inspect the turbocharger compressor wheel by hand.
Does the wheel turn easily and smoothly?
Yes
Go to the next step.
No
Replace the turbocharger.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
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. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
No
Install all removed parts in Step 9.
Inspect all turbocharger related parts installed correctly.
• If there is any malfunction:
― Repair or replace the malfunctioning part according to the inspection results.
13
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L3 Turbo].)
• 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.