Mazda Millenia Rough Idle

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Mazda Millenia has a rough idle?

While there are a variety of reasons your Mazda Millenia has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
of the time it's
Vacuum Leak
of the time it's
Spark Plugs
of the time it's
Ignition Coil

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Related Mazda Millenia Problems

Find the most common driver-reported problems that are to blame when a Mazda Millenia has a rough idle.
There are t-shaped vacuum connectors under the intake manifold that can break and cause a rough idle.
Misfires under load (acceleration) can be caused by the valve cover gaskets leaking oil into the spark plug wells sho...
Mazda Millenia Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Mazda Millenia Rough Idle Repair Symptoms

A failing ignition coil can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I...Read More
When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing. The driver would likely notice one or more of t...Read More