P0300 Need Help with Freeze Frame!
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,628
Likes: 4,072
From: Cape Coral, Florida
What kind of help you looking for ??…you have a random misfire but looking at fuel trims can tell if it’s ignition or fuel related…yours looks ok…does that code reader show misfire data ??
Thread Starter
Instructor
Joined: Mar 2023
Posts: 187
Likes: 36
2023 C6 of the Year Finalist - Unmodified
I got this code a few weeks back and cleared it, it came back under the same circumstances (leaving from work, it popped up a few seconds right after starting the car)
There where no signs of a random missfire and the car ran great. The cel does not flash to indicate an active misfire, and theres no weird sounds or vibrations.
The car drives and performs well so I have no clue what it could be. I changed the spark plugs and wires after the first code and it took it 76 start ups and almost 400 miles of driving to come back.
My rpms stay steady around 600 rpms and does not fluctuate when idling in park or in gear. The only time they do fluctuate is a few seconds after start up, which I thought was normal.
It seems to take the car while to meet the threshold to turn on the CEL with P0300 random missfire code.
Unfortunately the reader does not still have the missfire data as I have deleted the code again to see if it'll come on sooner or take just as long again.
