Rough Idle
Rough idle is uneven or shaky running when the engine is idling.
What is Rough Idle?
The car shakes noticeably, especially in drive with the brakes applied. Misfires, vacuum leaks and dirty injectors are common causes. Worn engine mounts can make normal vibrations feel much worse. Carbon build-up on direct-injection intake valves can cause it.
How it works
One or more cylinders produce less power than the others, so the crankshaft speed fluctuates.
Why it matters for your car
Read misfire counters to find the cylinder concerned. Check engine mounts if live data looks normal.
Other terms
- Backfire
- Body Filler
- Boost Leak
- CHAdeMO Connector
- Clay Bar (Paint Decontamination)
- Clearing Fault Codes
- Electric Current (Amperage)
- Engine Bay Cleaning
- Flasher Relay (Turn Signal Relay)
- Flat-Plane Crankshaft
- Fuel Pump Control Module (Fuel Pump Driver)
- Infotainment Head Unit
- Insulation Monitoring (Isolation Fault)
- Intelligent Speed Assistance (ISA)
- Permanent Code
- Relative Compression Test
- Service Interval
- Silencer (Muffler)
- Start-stop System
- Suspension Bushing