No. 21 Engine Noise: Notes

POSSIBLE CAUSES DESCRIPTIONS

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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE ). (See AFTER REPAIR PROCEDURE ). 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
  (See BEFORE REPAIR PROCEDURE ).
  
  (See AFTER REPAIR PROCEDURE ).
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.