No. 14 Poor Fuel Economy: Notes
NO. 14 POOR FUEL ECONOMY DESCRIPTION AND POSSIBLE CAUSE
| 14 |
POOR FUEL ECONOMY |
| DESCRIPTION |
- Fuel economy is unsatisfactory.
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| POSSIBLE CAUSE |
- Contaminated air cleaner element
- Improper ATF level (ATX)
- Brake dragging
- Clutch slippage (MTX)
- Improper coolant level
- Poor fuel quality
- Low tire pressure
- PCM DTC is stored.
- Engine cooling system malfunction
- Improper operation of cooling fan control system
- Spark plug 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 unit malfunction
- Improper operation of variable tumble control
- Improper operation of variable valve timing control system
- Improper operation of variable valve intake air control
- Exhaust system restricted
- Contaminated MAF sensor
- Low engine compression
- Improper valve timing
- PCV valve malfunction
WARNING:
- The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the 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
.) (See AFTER SERVICE PRECAUTION
.)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may 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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