Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2017 Mazda 5 GS, Automatic TransFACTORY OEM SERVICE PROCEDURE

No. 21 Engine Noise: Notes

NO. 21 ENGINE NOISE DESCRIPTION AND POSSIBLE CAUSE

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 mis-installation
Splash shield or under cover loose (splashed water to drive belts)

Rumble or grind noise:

Improper drive belt tension
Loose parts

Rattle sound noise:

Loose parts

Hiss sound noise:

Air leakage from intake air system
Loose spark plug
Vacuum leakage

Rap or roar noise:

Dynamic dumper loose
Exhaust system loose
Intake air system loose
Variable valve timing actuator malfunction
Variable tumble control system malfunction

Other noise:

Tappet noise
Timing chain noise

Chapter Navigation

Return to Chapter: No. 21 Engine Noise

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.