No.19 Exhaust Smoke: Notes

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

NO.19 DESCRIPTION AND POSSIBLE CAUSE

19	EXHAUST SMOKE
DESCRIPTION	Blue, black, or white smoke from the exhaust system
POSSIBLE CAUSE	Blue smoke (Burning oil): Engine internal oil leakage (Oil seal, side seal, apex seal etc.) 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. Excessive fuel pressure Improper engine compression Engine internal malfunction Abnormal engine oil condition (viscosity, deterioration) Low oil pressure Excessive fuel pressure Air mixed in oil line Metering oil pump clogging in oil pipe Leakage or clogging in oil pipe Leakage or clogging in oil nozzle Injector fuel leakage Ignition system malfunction WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this article. (See BEFORE REPAIR PROCEDURE .) (See AFTER REPAIR PROCEDURE .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 the exhaust system

POSSIBLE CAUSE

Blue smoke (Burning oil):

Engine internal oil leakage (Oil seal, side seal, apex seal etc.)

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.
Excessive fuel pressure
Improper engine compression
- Engine internal malfunction
- Abnormal engine oil condition (viscosity, deterioration)
- Low oil pressure
- Excessive fuel pressure
- Air mixed in oil line
- Metering oil pump clogging in oil pipe
  - Leakage or clogging in oil pipe
  - Leakage or clogging in oil nozzle
Injector fuel leakage
Ignition system malfunction
WARNING:
The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this article.
  (See BEFORE REPAIR PROCEDURE .)
  
  (See AFTER REPAIR PROCEDURE .)
CAUTION:
- Disconnecting/connecting quick release connector without cleaning it may possibly 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.