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.

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 1,000 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!
  1. Home
  2. Questions
  3. Rough idle and intermittent engine light on

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: What are some inexpensive possible solutions for a P2506 code?

A good way to protect yourself in a used car transaction is to request a pre-purchase vehicle inspection. That inspection, carried out by a certified Mechanic, dispatched to your location, will give you very specific data regarding any current problems...

Q: Air conditioner not working after a battery change

Hello. Thank you for writing in. At first, disconnect the battery and verify that all of the wires in the starting system and charging system are clean, dry, and tight. Make sure the battery cables are corrosion free, and have...

Q: Idle jumps up and down on manual trans with air coolant/thermostat engine code?

Hi A R. Thanks for contacting us tonight. If you could supply us with the OBD-II trouble code you received, this would seriously help us provide some practical ideas as to what's causing the symptoms you're experiencing.

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...