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
Improper drive belt tension
Auto tensioner bearing malfunction
Generator installation
Improper installation of purge solenoid valve
Splash shield or under cover looseness (splashed water to drive belts)

Rattle sound noise:

Loose parts

Hiss sound noise:

Vacuum leakage
Loose spark plug
Air leakage from intake air system

Rumble or grind noise:

Improper drive belt tension
Loose parts
Fluid level low or air in power steering fluid

Rap or roar noise:

Dynamic dumper looseness
Exhaust system looseness
Intake air system looseness
Variable valve timing actuator malfunction
Variable tumble control system malfunction
Improper balancer unit backlash

Other noise:

Tappet noise
Timing chain noise