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

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

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Go to Step 2

Go to Powertrain On Board Diagnostic (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 Symptoms

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 Pressure Test (VIN K) or Fuel System Pressure Test (VIN 1) .
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. Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) or Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F) .
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 Diagnostic Starting Point in Engine Cooling 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 Evaporative Emission Control System Diagnosis in 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 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 Exhaust Gas Recirculation (EGR) System Description .
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 Compression Test in 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 Powertrain On Board Diagnostic (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

System OK.