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Has a very rough idle and then it will cut off?

Tiny
TIFFANYJAMES
  • MEMBER
  • 2005 MAZDA 3
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 109,000 MILES
I have a 2005 Mazda 3 i. The problem that I am having is that my car keeps cutting off. When the car is at a complete stop it has a very rough idle and then it will cut off. What could be the problem with my car. I had the O2 sensors replaced and the gas cap replaced also and it still does the same thing. Please help!
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Monday, January 3rd, 2011 AT 6:30 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like you could have a clogged exhaust gas recirculation (EGR) valve.
An EGR valve works by recirculating little bit of the exhaust gas back to the the engine.
The EGR will get dirty and have gunk buildup inside of it and that will restrict airflow. When that happens the idle quality sufferers.
Sometimes it will trigger the check engine light.

Here is a helpful video on how to test the EGR valve:

https://youtu.be/DqUCbbKdWf4

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.
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Tuesday, August 17th, 2021 AT 8:12 PM

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