No.12 Lack/Loss Of Power-Acceleration/Cruise: Notes

POSSIBLE CAUSE & DESCRIPTION (LACK/LOSS OF POWER-ACCELERATION/CRUISE)

12	LACK/LOSS OF POWER-ACCELERATION/CRUISE
DESCRIPTION	Performance is poor under load (such as power down when climbing hills).
POSSIBLE CAUSE	Improper A/C system operation Erratic signal or no signal from CMP sensor Air leakage from intake-air system parts Restriction in intake-air system Intake air temperature too hot Improper variable intake air control operation Improper operation of electronic throttle control system Purge control solenoid malfunction Improper EGR valve operation Brake dragging Erratic signal from CKP sensor Low engine compression Vacuum leakage Poor fuel quality Erratic signal to ignition coil Engine overheating Throttle body malfunction Spark plug malfunction PCV valve malfunction Improper valve timing due to jumping out of timing belt Improper variable valve timing control operation Restriction in exhaust system Intermittent open or short in fuel pump related circuit Inadequate fuel pressure Fuel pump mechanical malfunction Fuel line restriction or clogging Fuel leakage from fuel injector Fuel injector clogging Erratic signal from accelerator pedal position sensor Erratic signal from TP sensor Intermittent open or short circuit in MAF sensor, Accelerator pedal position sensor, TP sensor, IAT sensor and VSS AT malfunction (AT) Clutch slippage (MT) WARNING: The following DIAGNOSTIC PROCEDURE TABLE 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 MANUAL" described in this article. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .) 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.

LACK/LOSS OF POWER-ACCELERATION/CRUISE

DESCRIPTION

Performance is poor under load (such as power down when climbing hills).

POSSIBLE CAUSE

Improper A/C system operation
Erratic signal or no signal from CMP sensor
Air leakage from intake-air system parts
Restriction in intake-air system
Intake air temperature too hot
Improper variable intake air control operation
Improper operation of electronic throttle control system
Purge control solenoid malfunction
Improper EGR valve operation
Brake dragging
Erratic signal from CKP sensor
Low engine compression
Vacuum leakage
Poor fuel quality
Erratic signal to ignition coil
Engine overheating
Throttle body malfunction
Spark plug malfunction
PCV valve malfunction
Improper valve timing due to jumping out of timing belt
Improper variable valve timing control operation
Restriction in exhaust system
Intermittent open or short in fuel pump related circuit
Inadequate fuel pressure
Fuel pump mechanical malfunction
Fuel line restriction or clogging
Fuel leakage from fuel injector
Fuel injector clogging
Erratic signal from accelerator pedal position sensor
Erratic signal from TP sensor
Intermittent open or short circuit in MAF sensor, Accelerator pedal position sensor, TP sensor, IAT sensor and VSS
AT malfunction (AT)
Clutch slippage (MT)
WARNING:
The following DIAGNOSTIC PROCEDURE TABLE 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 MANUAL" described in this article.
  (See BEFORE SERVICE PRECAUTION .)
  
  (See AFTER SERVICE PRECAUTION .)
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.