DEFINITION: Vehicle has excessive rotten egg smell. Excessive odors do not necessarily indicate excessive emissions.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

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Go to Step 2

Go to the Powertrain (OBD) System Check

1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found, correct the condition as instructed in the bulletin.

Was a bulletin found that addresses the symptom?

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Go to Step 18

Go to Step 3

Was a thorough visual/physical check performed?

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Go to Step 4

Go to Visual /Physical check

1. Check the following locations for vacuum leaks:

•	Vacuum lines

•	EGR system

•	Intake manifold

•	Throttle body

2. If a problem is found, repair as necessary.

Were any vacuum leaks located?

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Go to Step 18

Go to Step 5

1. Check the fuel cap for proper installation.
2. Secure the fuel cap if necessary.

Was the fuel cap installed properly?

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Go to Step 6

Go to Step 18

1. Check fuel pressure. Perform Fuel System Check.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 7

1. Check for faulty, plugged, or incorrectly installed crankcase ventilation valve; also check crankcase ventilation system for being plugged.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 8

1. Check the injector connections.
2. If any of the injector connectors are connected to an incorrect cylinder, correct as necessary.

Was a problem found?

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Go to Step 18

Go to Step 9

1. Perform Injector Flow/Voltage Drop Check.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 10

1. Refer to Cooling and Radiator for cooling system diagnosis.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 11

1. Check EVAP canister for fuel loading. Refer to Powertrain Emission System.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 12

Remove excessive carbon buildup with a top engine cleaner. Refer to instructions on top engine cleaner can.

Is the exhaust odor still present?

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Go to Step 13

Go to Step 18

Check items that can cause the engine to run rich. Make any necessary repairs.

Is the exhaust odor still present?

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Go to Step 14

Go to Step 18

Check items that can cause the engine to run lean. Make any necessary repairs.

Is the exhaust odor still present?

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Go to Step 15

Go to Step 18

1. Check the EGR system. Refer to EGR Diagnosis.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 16

1. Check for an engine mechanical problem. Perform a cylinder compression check. Refer to Engine Mechanical.
2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to Step 17

1. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no malfunctions have been found, review/inspect the following:

•	Visual/physical inspection.

•	Scan Tool data.

•	Freeze Frame data/Failure Records Data.

•	All electrical connections within a suspected circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 18

Go to the Powertrain (OBD) System Check

Operate the vehicle to duplicate conditions present when the original symptom was noted.

Is symptom still present?

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Go to Step 3

Repair complete.