NO.19 EXHAUST SMOKE [ZJ, Z6]

#
NO.19 EXHAUST SMOKE [ZJ, Z6]

B3E010318881W52

19 | EXHAUST SMOKE
--- | ---
DESCRIPTION | Blue, black, or white smoke from exhaust system

POSSIBLE CAUSE

Blue smoke (Burning oil):

• PCV valve malfunction
• Engine internal oil leakage

White smoke (Water in combustion):

• Cooling system malfunction (coolant loss)
• Engine internal coolant leakage

Black smoke (Rich fuel mixture):

• Air cleaner restriction
• Intake-air system is collapsed or restricted.
• Fuel return line is restricted.
• Excessive fuel pressure
• Improper engine compression
• Injector fuel leakage
• Ignition system malfunction

  Warning

The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:

  • 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 the "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual.
  (See BEFORE SERVICE PRECAUTION [ZJ, Z6, LF].)
  (See AFTER SERVICE PRECAUTION [ZJ, Z6, LF].)

  Caution

  • If there is foreign material on the connecting area of the quick release connector, it might damage the connector or fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
--- | --- | --- | ---
1 | What color is smoke coming from the exhaust system? | Blue | Burning oil is indicated. Go to the next step.
White | Water in combustion is indicated. Go to Step 3.
Black | Rich fuel mixture is indicated. Go to Step 4.

2

Remove and shake the PCV valve.
Does the PCV valve rattle?

Yes

Inspect for the following:
• Damaged valve guide, stems or valve seals
• Blocked oil drain passage in cylinder head
• Piston ring is not seated, seized or worn.
• Damaged cylinder bore
If other drivability symptoms are present, return to diagnostic index to service any additional symptoms.

No | Replace the PCV valve.
3 | Does the cooling system hold pressure? | Yes | Inspect for the following: • Cylinder head gasket leakage • Intake manifold gasket leakage • Cracked or porous engine block If other drivability symptoms are present, return to diagnostic index to service any additional symptoms.
No | Inspect for cause.
4 | Inspect for the following: • Air cleaner restriction • Collapsed or restricted intake-air system • Restricted fuel return line Are all items normal? | Yes | Go to the next step.
No | Service if necessary. Repeat Step 4.
5 | Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs using WDS or equivalent. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE [ZJ, Z6].)
No | No DTC is displayed: Go to the next step.
6 | Install fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? (See FUEL LINE PRESSURE INSPECTION [ZJ, Z6, LF].) | Yes | Go to the next step.

No

Low:

Inspect the fuel line for clogging.
• If there is no malfunction, replace fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [ZJ, Z6, LF].)

High:

Replace fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [ZJ, Z6, LF].)

7 | Perform the spark test. (See Spark Test.) Is strong blue spark visible at each cylinder? | Yes | Inspect the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [ZJ, Z6].)
No | Repair or replace the malfunctioning part according to spark test result.

8

Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [ZJ, Z6].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.

  - If vehicle repaired, troubleshooting completed.
  - If vehicle not repaired or additional diagnostic information not available, replace the PCM.
  (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [ZJ, Z6].)