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2008 - MX-5 - Engine

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

  • 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 MLA 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

  • P/S fluid level

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 symptom troubleshooting "No.11 Knocking/pinging".

(See NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [LF].)

No

If the noise comes from the engine internal, inspect for friction gear, timing chain or MLA 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].)




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