Skip the auto shop - Our mechanics make house calls

Q: Rough idle and intermittent engine light on

asked by on

Could this be the purge valve, the engine management light is going on and off

My car has 71000 miles.
My car has a manual transmission.

A: Hello there, many faults can cause a rough ...

Hello there, many faults can cause a rough idle and the Check Engine Light to be on with your 2007 Mazda 3.

The first course of action would be to check what code is stored in the ECU. This code will help determine what direction to go with diagnosis.

Some common causes of a rough idle are the spark plugs, coils, vacuum leak, oxygen sensors, exhaust leak, fuel pump, MAF sensor, or a wiring harness fault.

A qualified technician such as one from YourMechanic will be able to diagnose your rough idle and make any repairs required to resolve the issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Check Engine Light is on, trouble codes P0001 and P0006 are showing.

The fuel shut off valve is a solenoid that is controlled primarily by the shut off relay. The message you are receiving is telling you the circuit has low voltage. This means the solenoid is not energizing the way it...

Q: My Check Engine Light is on - code P0430

Hi there. If you are getting this code along with a loss of power, it usually means that the catalytic converter is failing. When it fails internally it begins to clog the exhaust which will cause the lack of power....

Q: Pin in ECU connection broke and car won't start

This sounds like a pretty big deal. If the pin is one the connector side, you may be able to simply replace it with a new pig tail end. If the broken pin is in the ECU, unfortunately the ECU...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.