No.11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges: 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.11 DESCRIPTION AND POSSIBLE CAUSE

11	ENGINE STALLS/QUITS - ACCELERATION/CRUISE ENGINE RUNS ROUGH - ACCELERATION/CRUISE MISSES - ACCELERATION/CRUISE BUCK/JERK - ACCELERATION/CRUISE/DECELERATION HESITATION/STUMBLE - ACCELERATION SURGES - ACCELERATION/CRUISE
DESCRIPTION	The engine stops unexpectedly at the beginning of acceleration or during acceleration. The engine stops unexpectedly while cruising. The engine speed fluctuates during acceleration or cruising. The engine misses during acceleration or cruising. The vehicle bucks/jerks during acceleration, cruising, or deceleration. The momentary pause at the beginning of acceleration or during acceleration The momentary minor irregularity in the engine output
POSSIBLE CAUSE	Vacuum leakage Air leakage from intake-air system Air cleaner restriction Air suction at intake-air system (between MAF sensor and intake ports) Improper operation of drive-by-wire control system (abnormal accelerator position and TP signals to PCM) Throttle body malfunction (stuck close) Improper SSV operation Improper APV operation* Poor fuel quality Inadequate fuel pressure Fuel pump mechanical malfunction Fuel leakage from fuel injector Fuel injector clogging Fuel line restriction or clogging Pressure regulator (integrated in fuel pump unit) malfunction Intermittent open or short in fuel pump body circuit Fuel pump relay malfunction (stuck open) Restriction in exhaust system Purge solenoid valve malfunction Improper air/fuel ratio control MAF sensor improper installation Intermittent open or short of MAF sensor, TP sensor, APP sensor and VSS Erratic signal from eccentric shaft position sensor Improper ignition timing control (abnormal ECT, IAT, MAF and knock signals to PCM) Improper fuel injection control (abnormal MAF, ECT, and front/rear HO2S signals to PCM) Improper load signal (neutral/CPP switch (MT), TR switch (AT)) to PCM Main relay intermittent malfunction Low engine compression Engine internal malfunction Abnormal engine oil condition (viscosity, deterioration) Low oil pressure Excessive fuel injector Air mixed in oil line Metering oil pump malfunction Leakage or clogging in oil pipe Leakage or clogging in oil nozzle Metering oil pump malfunction Improper metering oil pump control operation Engine overheating Spark leakage from high-tension leads Spark plug malfunction Improper A/C system operation Improper torque converter clutch control operation (AT) Improper shift point (AT) AT malfunction (AT) Clutch slippage (MT) WARNING: The following troubleshooting flow chart contains 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 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.

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

DESCRIPTION

The engine stops unexpectedly at the beginning of acceleration or during acceleration.
The engine stops unexpectedly while cruising.
The engine speed fluctuates during acceleration or cruising.
The engine misses during acceleration or cruising.
The vehicle bucks/jerks during acceleration, cruising, or deceleration.
The momentary pause at the beginning of acceleration or during acceleration
The momentary minor irregularity in the engine output

POSSIBLE CAUSE

Vacuum leakage
Air leakage from intake-air system
Air cleaner restriction
Air suction at intake-air system (between MAF sensor and intake ports)
Improper operation of drive-by-wire control system (abnormal accelerator position and TP signals to PCM)
Throttle body malfunction (stuck close)
Improper SSV operation
Improper APV operation*
Poor fuel quality
Inadequate fuel pressure
Fuel pump mechanical malfunction
Fuel leakage from fuel injector
Fuel injector clogging
Fuel line restriction or clogging
Pressure regulator (integrated in fuel pump unit) malfunction
Intermittent open or short in fuel pump body circuit
Fuel pump relay malfunction (stuck open)
Restriction in exhaust system
Purge solenoid valve malfunction
Improper air/fuel ratio control
MAF sensor improper installation
Intermittent open or short of MAF sensor, TP sensor, APP sensor and VSS
Erratic signal from eccentric shaft position sensor
Improper ignition timing control (abnormal ECT, IAT, MAF and knock signals to PCM)
Improper fuel injection control (abnormal MAF, ECT, and front/rear HO2S signals to PCM)
Improper load signal (neutral/CPP switch (MT), TR switch (AT)) to PCM
Main relay intermittent malfunction
Low engine compression
- Engine internal malfunction
- Abnormal engine oil condition (viscosity, deterioration)
- Low oil pressure
- Excessive fuel injector
- Air mixed in oil line
- Metering oil pump malfunction
  - Leakage or clogging in oil pipe
  - Leakage or clogging in oil nozzle
Metering oil pump malfunction
Improper metering oil pump control operation
Engine overheating
Spark leakage from high-tension leads
Spark plug malfunction
Improper A/C system operation
Improper torque converter clutch control operation (AT)
Improper shift point (AT)
AT malfunction (AT)
Clutch slippage (MT)
WARNING:
The following troubleshooting flow chart contains 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 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.