No.21 Engine Noise: Notes

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 Generator installation Auto tensioner bearing malfunction Splash shield or under cover loose (splash water to drive belt) 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: Dynamic dumper loose Exhaust system loose Intake-air system loose Variable valve timing actuator malfunction Variable swirl control system malfunction Improper balancer unit backlash 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 Tappet 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 .) (See AFTER SERVICE PRECAUTION .) 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 from under hood.

POSSIBLE CAUSE

Squeal, click or chirp noise:

Improper engine oil level
Loose installation of solenoid valves
Improper drive belt tension
Generator installation
Auto tensioner bearing malfunction
Splash shield or under cover loose (splash water to drive belt)
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:
Dynamic dumper loose
Exhaust system loose
Intake-air system loose
Variable valve timing actuator malfunction
Variable swirl control system malfunction
Improper balancer unit backlash
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
Tappet 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 .) (See AFTER SERVICE PRECAUTION .)

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.