| 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.
- Erratic signal to PCM
- APP sensor or related wiring harness malfunction
- ECT sensor or related wiring harness malfunction
- IAT sensor or related wiring harness malfunction
- MAF sensor or related wiring harness malfunction
- MAP sensor or related wiring harness malfunction
- A/F sensor or related wiring harness malfunction
- HO2S or related wiring harness malfunction
- TP sensor or related wiring harness malfunction
- VSS or related wiring harness malfunction
- Excessive or insufficient fuel pressure
- Fuel pump relay or fuel pump circuit malfunction
- Restriction in fuel line
- Pressure regulator malfunction (built-into fuel pump unit)
- Fuel pump malfunction
- Ignition system malfunction
- CMP sensor malfunction
- Improper engine compression
- Improper fuel injection timing and/or amount
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 "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION
.) (See AFTER SERVICE PRECAUTION
.)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
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