P0300 why would a car only have this code?

Tiny
BHAMDOC1973
  • MEMBER
  • 2013 CHEVROLET EQUINOX
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 102,000 MILES
Very minor idle stumble but overall smooth. Why would a car only have this code?
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Sunday, August 21st, 2022 AT 2:01 PM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

A P0300 indicates a random misfire. This can be caused by a few things. Since you indicated it runs good other than a minor stumble at idle, my first suspect would be an engine vacuum leak or the need for a tune-up.

Has the vehicle been tuned up with new spark plugs recently? It should be done by 100K. If it has, then I need you to check for engine vacuum leaks. Here is a link that explains how to do it:

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

Let me know what you find or if you have other questions.

Take care,

Joe
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Sunday, August 21st, 2022 AT 8:46 PM

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