Home

< Previous   Next >

2008 - MX-5 - Engine

NO.26 EXHAUST SULPHUR SMELL [LF]



26

EXHAUST SULPHUR SMELL

DESCRIPTION

Rotten egg smell (sulphur) from exhaust

POSSIBLE CAUSE

  • Electrical connectors are disconnected or connected poorly

  • Charcoal canister malfunction

  • Vacuum lines are disconnected or connected improperly.

  • Improper fuel pressure

  • Poor fuel quality

WARNING:

The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing fuel system:
  • 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 injuries 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 [LF].)

    (See AFTER SERVICE PRECAUTION [LF].)

CAUTION:

  • Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.


Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1

Are any driveability or exhaust smoke concerns present?

Yes

Go to the appropriate flow chart.

No

Go to the next step.

2

Inspect the following:

  • Electrical connections

  • Vacuum lines

  • Fuel quality

Are all items normal?

Yes

Go to the next step.

No

Service if necessary.

Repeat Step 2.

3

Connect the M-MDS to the DLC-2.

Turn the ignition switch to the ON position (Engine off).

Retrieve any DTCs.

Are there any DTCs displayed?

Yes

DTC is displayed:

Go to the appropriate DTC inspection.

(See DTC TABLE [LF].)

No

No DTC is displayed:

Go to the next step.

4

Install the fuel pressure gauge between the fuel pipe and the fuel distributor.

Start engine and idle it.

Is fuel line pressure correct at idle?

(See FUEL LINE PRESSURE INSPECTION [LF].)

Yes

Go to the next step.

No

Low:

Inspect fuel pump relay and fuel pump circuit.

Inspect the fuel line for clogging.

If there is no malfunction, replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [LF].)

High:

Replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [LF].)

5

Inspect the charcoal canister for fuel saturation.

Is excess amount of liquid fuel present in canister?

Yes

Replace the charcoal canister.

No

Inspect the fuel tank vent system.

If the fuel tank vent system is normal, suggest trying a different brand since sulphur content can vary in different fuels.

If the fuel tank vent system is not normal, repair or replace the malfunctioning part.

6

  • 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].)




< Previous   Next >
Back to Top
© 2012 Mazda North American Operations, U.S.A.