Rough idle on start up?

Tiny
TIM LENE
  • MEMBER
  • 2006 MAZDA B3000
  • 82,000 MILES
My truck has a rough idle on start up what is wrong?
Wednesday, November 16th, 2011 AT 1:09 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Does it only have rough idle when you first start it, then it runs normal?
It could be a vacuum leak that goes away after the engine components warms up.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

It can also be due to weak spark plugs, or dirty throttle body or air flow sensor.
Sometimes rough idle can trigger the check engine light.
Is your engine light illuminated? If so, having the vehicle scanned can help with the diagnostics.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let me know of any questions.
Thank you.
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Thursday, October 7th, 2021 AT 3:27 PM

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