What is the reason for the lag during acceleration?
Is there a jerk a few seconds after the accelerator pedal is depressed and the car jerks? Or at the moment of acceleration, the car cannot reach the desired speed?
Having detected such problems, you should not put off fixing them for later. Slumps when overtaking passing cars on the road, do not bode well. Having detected the first signs, you can try to diagnose the problem yourself, but it is better to contact the technical center. Experienced mechanics on modern equipment will quickly find and eliminate the cause of lagging during acceleration.
Sags during acceleration, can appear at different moments:
For a couple of seconds there is no reaction after the accelerator pedal is depressed.
For 4-10 seconds the engine rpm is lost and the car may stall.
The car moves for 1-2 seconds jerkily.
The engine decelerates and speeds up when the accelerator pedal is not engaged.
Common causes for failure to accelerate:
- Worn spark plugs and high-voltage wires
- Clogged fuel injectors
- Clogged throttle valve
- Clogged air filter
- Gasoline pump malfunction
It is not uncommon for malfunctions to occur due to malfunctions in the fuel system. When accelerating, the system increases the amount of fuel supplied to the cylinders. The change in the proportions of fuel provokes sagging during acceleration. The throttle and fuel injectors should be inspected. When the choke or injectors are clogged, it can cause delayed auto response when accelerating.
Check the condition of the fuel, air and oil filters.
Filters can become clogged, resulting in poor performance and increased fuel consumption. They should be changed regularly.
Faults in the ignition system are also possible. Initially, it is necessary to take out and examine the plugs. Soot on the plugs, insufficient contact with the spark plug wires, or an overly rich or poor mixture, will cause the plugs to malfunction. High voltage wires can also cause motor and ignition coil failure. The high-voltage wires should not be damaged and should not spark when the engine is running.
To identify the exact cause of the failure to accelerate the car with an injector engine, requires special, diagnostic equipment. For this purpose it is better to contact us in car service in Moscow.
What recommends the manufacturer
- Electronic diagnostics – connection of the diagnostic scanner for reading of errors in the data logger
- If necessary, performing step-by-step troubleshooting based on the results of electronic diagnostics
- Carrying out works on the basis of the data revealed by the diagnostics
On-board computer error codes for the symptom of lagging at acceleration in the Audi A4?
|Error code: Decimal / HEX / OBD II
|Inlet pressure/air pressure=>G71/F96: Invalid signal
|Intake pressure/air pressure=>G71/F96: Signal level too low
|Intake pressure/air pressure=>G71/F96: Signal level too high
|Absolute manifold pressure sensor (MAP) / atmospheric pressure sensor – unreliable contact in an electrical circuit
|Intake air temperature sensor-G42: Signal level too low
|Intake air temperature sensor-G42: Signal level too high
|Intake air temperature sensor-G42: No signal
|Coolant temperature sensor-G62: Invalid signal
|Coolant temperature sensor-G62: Signal level too low
|Coolant temperature sensor-G62, signal level too high
|Coolant temperature sensor – unreliable contact in an electrical circuit
|Throttle potentiometer-G69: Signal level too low
|Throttle potentiometer-G69: Signal level too high
|Row 1-probe 1: electrical circuit failure
|Row 1-probe 1: electrical circuit failure
|Row 1-Sonde 1: Voltage too low
|Row 1-probe 1: reaction time is too long
|Row 1-sonde 1: no activity
|Row 1-probe 2: electrical circuit failure
|Row 1-Sonde 2: Voltage too low
|Row 1-probe 2: Voltage too high
|Row 1-Sonde 2: Signal rate too low
|Row 1: Failure of the fuel-air mixture detection system
|Row 1, fuel-air mixture detection system: mixture too lean
|Row 1, fuel-air mixture detection system: mixture too rich
|Row 2: Failure of the fuel-air mixture detection system
|Cylinder nozzle 1-N30: electrical circuit failure
|Cylinder nozzle 2-N31: electrical circuit failure
|Cylinder nozzle 3-N32: electrical circuit failure
|Cylinder nozzle 4-N33: electrical circuit failure
|Throttle angle sensor G188: Signal level too low
|Throttle angle sensor G188: Signal level too high
|Fuel pump relay – low voltage circuit
|Fuel pump relay – high voltage circuit
|Cylinder nozzle 1-N30: short to ground
|Cylinder nozzle 1-N30: short to plus
|Cylinder nozzle 2-N31: short to ground
|Cylinder nozzle 2-N31: short-circuit to plus
|Cylinder nozzle 3-N32: short to ground
|Cylinder nozzle 3-N32, short-circuit to plus
|Cylinder nozzle 4-N33: short to ground
|Cylinder nozzle 4-N33: short-circuit to plus
|Load accounting error
|Row 3, lambda correction after catalyst: control limit reached
|Cylinder nozzle 1-N30: open circuit
|Electronic engine cooling control thermostat-F265, short-circuit to plus
|Electronic engine cooling control thermostat-F265: short to ground
|The inlet sliders of the 1st row of cylinders do not close
|Inlet channel flaps: electrical circuit failure
|Throttle motor – open circuit
|Throttle control unit – processor error
|Throttle control unit – operation
|Throttle actuator, throttle valve – range/function
|Accelerator pedal position sensor-G79: signal level too low
|Accelerator pedal position sensor-G79: signal level too high
|Accelerator pedal position sensor-G185: Signal level too low
|Accelerator pedal position sensor-G185: Signal level too high
|Accelerator pedal position sensor / A/B switch – voltage correlation
|Accelerator pedal position 1/2 sensors-G79+G185: Invalid signal
|Throttle control system – idle position adaptation not performed
|Row 1, fuel-air mix detection system: too lean mixture in the system at rpm above idle speed
|Row 1, fuel-air mixture detection system: too lean mixture in the system at idle speed
|Row 1, fuel-air mixture detection system: too rich mixture in the system at idle speed
|Row 1, fuel-air mixture detection system: too lean mixture in the system at full load
|Row 2, fuel-air mixture detection system: too lean mixture in the system at full load
|Lambda probe 1-row 1: too lean mixture signal
|Lambda probe 1-row 1: signal too rich mixture
|Secondary air pump relay-J299: short-circuit to plus
|Charge pressure of turbocharger/driven supercharger – operation
|Fuel filter water sensor – range/function
|Fuel pressure regulator 1, exceeding control limit – low fuel pressure
|Fuel pressure regulator 1, exceeding control limit – high fuel pressure
|Tight/clogged intake system between air filter and air flow sensor
|Leaks between throttle body and intake valves
|Nozzle control pressure, starter cranking – pressure too low
|Row 1, probe 1, lambda probe signal, voltage in forced idling mode: control limit exceeded
|Control signal to ignition coil 1: short to ground
|Control signal to ignition coil 2: short to ground