No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges: Notes

WARNING: This page is about a different variant/trim than selected.

POSSIBLE CAUSES DESCRIPTIONS

11	ENGINE STALLS/QUITS - ACCELERATION/CRUISE ENGINE RUNS ROUGH - ACCELERATION/CRUISE BUCK/JERK - ACCELERATION/CRUISE/DECELERATION HESITATION/STUMBLE - ACCELERATION SURGES - ACCELERATION/CRUISE
DESCRIPTION	Engine stops unexpectedly at beginning of acceleration or during cruise. Engine stops unexpectedly while cruising. Engine speed fluctuates during acceleration or cruising. Engine misses during acceleration or cruising. Vehicle bucks/jerks during acceleration, during or deceleration. Momentary pause at beginning of acceleration or during acceleration Momentary minor irregularity in engine output
POSSIBLE CAUSE	A/C system improper operation Air leakage from intake-air system Intake-air system restriction Purge solenoid valve malfunction Improper operation of electronic throttle control system EGR system malfunction Low engine compression Turbocharger malfunction Improper operation of wastegate control system Vacuum leakage Poor fuel quality Main relay intermittent malfunction Throttle body malfunction Engine overheating Spark plug malfunction Variable swirl system malfunction Air cleaner restriction PCV valve malfunction Improper valve timing due to jumping out timing chain Exhaust system and/or three-way catalytic converter restriction Intermittent open or short circuit in fuel pump circuit Incorrect fuel injection timing Inadequate fuel pressure (high or low pressure side) Fuel pressure sensor or related circuit malfunction Suction control valve malfunction (built-in high pressure fuel pump) Relief valve malfunction (built-in delivery pipe) High pressure fuel pump malfunction Fuel injector malfunction Improper fuel pump speed control operation Fuel pump mechanical malfunction Fuel line restriction or clogging Improper air/fuel mixture ratio control operation Erratic or no signal from CMP sensor Erratic signal from CKP sensor Front and/or rear HO2S sensor or related circuit malfunction Accelerator position sensor or related circuit malfunction MAF sensor or related circuit malfunction Neutral switch or related circuit malfunction ECT sensor or related circuit malfunction Manifold absolute pressure (MAP) sensor or related circuit malfunction IAT sensor No.1 or related circuit malfunction IAT sensor No.2 or related circuit malfunction Intermittent open or short circuit MAF sensor, accelerator position sensor, TP sensor and VSS Clutch slippage Injector driver module or related circuit malfunction 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 injury 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 manual. (See AFTER REPAIR PROCEDURE ). (See BEFORE REPAIR PROCEDURE ). CAUTION: Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

ENGINE STALLS/QUITS - ACCELERATION/CRUISE
ENGINE RUNS ROUGH - ACCELERATION/CRUISE
BUCK/JERK - ACCELERATION/CRUISE/DECELERATION
HESITATION/STUMBLE - ACCELERATION
SURGES - ACCELERATION/CRUISE

DESCRIPTION

Engine stops unexpectedly at beginning of acceleration or during cruise.
Engine stops unexpectedly while cruising.
Engine speed fluctuates during acceleration or cruising.
Engine misses during acceleration or cruising.
Vehicle bucks/jerks during acceleration, during or deceleration.
Momentary pause at beginning of acceleration or during acceleration
Momentary minor irregularity in engine output

POSSIBLE CAUSE

A/C system improper operation
Air leakage from intake-air system
Intake-air system restriction
Purge solenoid valve malfunction
Improper operation of electronic throttle control system
EGR system malfunction
Low engine compression
Turbocharger malfunction
Improper operation of wastegate control system
Vacuum leakage
Poor fuel quality
Main relay intermittent malfunction
Throttle body malfunction
Engine overheating
Spark plug malfunction
Variable swirl system malfunction
Air cleaner restriction
PCV valve malfunction
Improper valve timing due to jumping out timing chain
Exhaust system and/or three-way catalytic converter restriction
Intermittent open or short circuit in fuel pump circuit
Incorrect fuel injection timing
Inadequate fuel pressure (high or low pressure side)
Fuel pressure sensor or related circuit malfunction
Suction control valve malfunction (built-in high pressure fuel pump)
Relief valve malfunction (built-in delivery pipe)
High pressure fuel pump malfunction
Fuel injector malfunction
Improper fuel pump speed control operation
Fuel pump mechanical malfunction
Fuel line restriction or clogging
Improper air/fuel mixture ratio control operation
Erratic or no signal from CMP sensor
Erratic signal from CKP sensor
Front and/or rear HO2S sensor or related circuit malfunction
Accelerator position sensor or related circuit malfunction
MAF sensor or related circuit malfunction
Neutral switch or related circuit malfunction
ECT sensor or related circuit malfunction
Manifold absolute pressure (MAP) sensor or related circuit malfunction
IAT sensor No.1 or related circuit malfunction
IAT sensor No.2 or related circuit malfunction
Intermittent open or short circuit MAF sensor, accelerator position sensor, TP sensor and VSS
Clutch slippage
Injector driver module or related circuit malfunction
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 injury 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 manual.
  (See AFTER REPAIR PROCEDURE ).
  
  (See BEFORE REPAIR PROCEDURE ).
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.