Engine Surging (Hunting Idle)
Surging is when engine speed rises and falls repeatedly without the driver changing the accelerator position.
What is Engine Surging (Hunting Idle)?
It often happens at idle, but can also occur at steady speed. Vacuum leaks, dirty throttle bodies and faulty idle control are typical causes. Torque converter or cruise control faults can feel similar. Unmetered air after the air flow sensor is a classic cause.
How it works
The control system overcorrects again and again because it receives wrong information or cannot control air flow precisely.
Why it matters for your car
Check for vacuum leaks and clean the throttle body if needed. Perform an idle or throttle relearn after cleaning or replacing parts.
Other terms
- Acoustic Glass (Laminated Side Windows)
- AdBlue Heater
- Battery State Of Health (SoH)
- Drum Brake
- Dynamo (DC Generator)
- EU Tyre Label
- Intake Air Temperature Sensor
- Lowering Springs
- Mode 3 Charging Cable (Type 2 Cable)
- Night Vision Assist
- OBD Port (Diagnostic Connector)
- Oil Sump (Oil Pan)
- Parking Heater (Auxiliary Heater)
- Patina
- Power Steering Pump
- State Of Charge (SoC)
- Surround View Camera (360-degree Camera)
- Tie Rod End
- Upholstery Cleaning
- Wastegate