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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]NO. 21 ENGINE NOISE [LF]
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

No. 21 Engine Noise [LF]

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION No. 21 Engine Noise [LF]
21  ENGINE NOISE 
DESCRIPTION 
  • Engine noise from under hood.
POSSIBLE CAUSE  Squeal, click or chirp noise: 
  • Improper engine oil level
  • Improper drive belt tension
  • Generator installation (alignment)
  • 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
  • Air in power steering fluid
  • Improper P/S fluid level

Rap or roar noise: 
  • Dynamic dumper looseness
  • Exhaust system looseness
  • Intake-air system looseness

Other noise: 
  • Camshaft friction gear noise or tappet noise
  • Timing chain noise
DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 Is a squealing, click or chirping sound present? Yes Inspect for the followings:
  • Engine oil level
  • Drive belt tension
  • Splash shield or under cover looseness
  • Generator installation (alignment)
No Go to the next step.
2 Is a rumbling or grinding noise present? Yes Inspect for the followings:
  • Drive belt tension
  • Loose parts in engine compartment
  • P/S fluid level

Repair or replace malfunctioning part according to inspection result. If normal, perform the power steering fluid line air bleeding.
No Go to the next step.
3 Is a rattling noise present? Yes Inspect rattling location for loose parts.
No Go to the next step.
4 Is a hissing noise present? Yes Inspect for the following:
  • Vacuum leakage
  • Spark plug looseness
  • Intake-air system leakage
No Go to the next step.
5 Is a rapping or roar noise present? Yes Inspect looseness for followings:
  • Dynamic dumper
  • Intake-air system
  • Exhaust system
No Go to the next step.
6 Is a knocking noise present? Yes Go to the symptom troubleshooting "No. 13 Knocking/pinging-acceleration/cruise".
(See NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [LF] ).
No If the noise comes from the engine internal, inspect for friction gear, timing chain or tappet noise.
7
  • Verify test results.
    • If normal, return to diagnostic index to service any additional symptoms.

      (See SYMPTOM DIAGNOSTIC INDEX [LF] ).

    • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
      • If vehicle is repaired, troubleshooting completed.
      • If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.

        (See PCM REMOVAL/INSTALLATION [LF] ).
RENDER: 1.0x

NO RELATED

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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.