Mazda Protege5 Rough Idle

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

What are common reasons my Mazda Protege5 has a rough idle?

While there are a variety of reasons your Mazda Protege5 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 Protege5 Questions

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Engine is idling low (650 rpm)-- rough and stalls. engine check light on with code p0300 only. changed the plugs and ...

Related Mazda Protege5 Problems

Find the most common driver-reported problems that are to blame when a Mazda Protege5 has a rough idle.
The passages for the exhaust gas recirculation (egr) system can become restricted or clogged causing the check engine...
Mazda Protege5 Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Mazda Protege5 Rough Idle Repair Symptoms

A failing ignition coil will create misfires in the engine, and lead to hesitation, extreme power loss, engine stalling, poor fuel mileage, and illumination of the check engine ...Read More
As we discussed, spark plugs are necessary for any gasoline engine to run. When they fail, the engine is in a constant state of attempting to ignite air and fuel, but cannot. Th...Read More