Rough or Shaky Idle: Common Causes
An engine that shakes or stumbles at idle usually has a fixable cause. A Cranbourne West specialist explains.
What it usually means
A rough idle is commonly a misfire (worn plugs/coils), a vacuum leak, a dirty throttle body or idle-control issue, dirty injectors, or carbon build-up on direct-injection engines. A check-engine light often accompanies a misfire.
If it shakes at idle but smooths out when driving, that points to idle-specific causes.
What you should do
Book a diagnosis — a misfire left too long can damage the catalytic converter. Note any warning light and when the shake happens.
We read the live data to pinpoint the cause.
How we find & fix it
Because the same symptom can have several causes, we use dealer-level diagnostics and a methodical check to pinpoint the real cause — rather than throwing parts at it.
You get a clear explanation and a fixed written quote before any work. Book online in 60 seconds or call 03 8782 0711.
Rough or Shaky Idle: Common Causes — FAQ
Usually a misfire, vacuum leak, dirty throttle body/injectors, or carbon build-up. We diagnose.
A sustained misfire can damage the catalytic converter — worth diagnosing promptly.
On direct-injection engines, yes — it can be cleaned.
We read fault codes and live data with dealer-level tools.
Related guides & services
Car doing something odd?
Trusted Cranbourne West car specialists — RACV-accredited, fixed written pricing. Book online or call 03 8782 0711.