No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

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	Engine stops unexpectedly at the beginning of acceleration or during acceleration Engine stops unexpectedly while cruising. Engine speed fluctuates during acceleration or cruising. Engine misses during acceleration or cruising. Vehicle bucks/jerks during acceleration, cruising, or deceleration Momentary pause at beginning of acceleration or during acceleration Momentary minor irregularity in engine output
POSSIBLE CAUSE	Improper A/C system operation Erratic signal or no signal from CMP sensor Air leakage from intake air system parts Purge solenoid valve malfunction Improper operation of electronic throttle control system EGR valve malfunction Erratic signal from CKP sensor Low engine compression Vacuum leakage Poor fuel quality Main relay intermittent malfunction Throttle body malfunction Engine overheating Spark plug malfunction Improper air/fuel mixture ratio control operation Improper variable tumble control operation Erratic signal to ignition coil Air cleaner restriction PCV valve malfunction Fuel flow into evaporative purge hose Improper valve timing due to jumping out timing chain Restriction in exhaust system Intermittent open or short circuit in fuel pump circuit Inadequate fuel pressure Fuel pump mechanical malfunction Fuel shut-off valve malfunction integrated with fuel tank Fuel leakage from fuel injector Fuel injector clogging Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) Erratic signal form APP sensor Erratic signal form TP sensor Intermittent open or short circuit of MAF sensor, TP sensor, APP sensor and VSS ATX malfunction (ATX) Clutch slippage (MTX) Improper variable intake air control operation Loose attaching bolts or worn engine mounts 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 [L5] .) (See AFTER SERVICE PRECAUTION [L5] .) 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.

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

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

POSSIBLE CAUSE

Improper A/C system operation
Erratic signal or no signal from CMP sensor
Air leakage from intake air system parts
Purge solenoid valve malfunction
Improper operation of electronic throttle control system
EGR valve malfunction
Erratic signal from CKP sensor
Low engine compression
Vacuum leakage
Poor fuel quality
Main relay intermittent malfunction
Throttle body malfunction
Engine overheating
Spark plug malfunction
Improper air/fuel mixture ratio control operation
Improper variable tumble control operation
Erratic signal to ignition coil
Air cleaner restriction
PCV valve malfunction
Fuel flow into evaporative purge hose
Improper valve timing due to jumping out timing chain
Restriction in exhaust system
Intermittent open or short circuit in fuel pump circuit
Inadequate fuel pressure
Fuel pump mechanical malfunction
Fuel shut-off valve malfunction integrated with fuel tank
Fuel leakage from fuel injector
Fuel injector clogging
Fuel line restriction or clogging
Pressure regulator malfunction (built-in fuel pump unit)
Erratic signal form APP sensor
Erratic signal form TP sensor
Intermittent open or short circuit of MAF sensor, TP sensor, APP sensor and VSS
ATX malfunction (ATX)
Clutch slippage (MTX)
Improper variable intake air control operation
Loose attaching bolts or worn engine mounts
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 [L5] .)
  
  (See AFTER SERVICE PRECAUTION [L5] .)
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.