No. 19 Exhaust Smoke: Notes

NO. 19 EXHAUST SMOKE REFERENCE CHART (MZI-3.7)

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. PCM DTC is stored Erratic signal to PCM APP sensor or related circuit malfunction CHT sensor or related circuit malfunction IAT sensor or related circuit malfunction MAF sensor or related circuit malfunction MAP sensor or related circuit malfunction A/F sensor or related circuit malfunction HO2S or related circuit malfunction TP sensor or related circuit malfunction VSS or related circuit malfunction Excessive fuel pressure Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit Ignition system malfunction Ignition coil malfunction Ignition coil related circuit malfunction Spark plug malfunction Erratic CMP sensor signal Improper engine compression Improper fuel injection timing and amount 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 service information. (See BEFORE SERVICE PRECAUTION article.) (See AFTER SERVICE PRECAUTION article.) 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.

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.
PCM DTC is stored
Erratic signal to PCM
- APP sensor or related circuit malfunction
- CHT sensor or related circuit malfunction
- IAT sensor or related circuit malfunction
- MAF sensor or related circuit malfunction
- MAP sensor or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- TP sensor or related circuit malfunction
- VSS or related circuit malfunction
Excessive fuel pressure
- Fuel pump mechanical malfunction
- Fuel line restriction or clogging
- Pressure regulator malfunction (built-in fuel pump unit
Ignition system malfunction
- Ignition coil malfunction
- Ignition coil related circuit malfunction
- Spark plug malfunction
Erratic CMP sensor signal
Improper engine compression
Improper fuel injection timing and amount
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 service information.
  (See BEFORE SERVICE PRECAUTION article.)
  
  (See AFTER SERVICE PRECAUTION article.)
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.