5pntslo
Member
- Joined
- Jan 30, 2017
- Threads
- 3
- Messages
- 10
- Reaction score
- 0
- Location
- Scottsdale
- First Name
- Ian
- Vehicle(s)
- 2016 Mustang GT
- Thread starter
- #1
So, about a week ago I installed long tube headers, using o2 extensions for the front and deleting the rear o2 sensors. Flashed the car with a new tune and it ran good. However after a cold start, the car gave me a P0300 code, I did a crank relearn which seemed to solve the issue, for about a day. In the morning I started the car up, from another cold start and got another misfire code. This time I was advised to to a KAM reset. Once again the code went away for about a day. The code is back once again! Im stumped as I have researched on multiple forums and haven't found anything for my situation. The car itself feels fine and doesn't really sound like it is misfiring. The code always comes on after the car calms down from a cold start, then the light stays on. I don't have any vacuum leaks, and everything else is connected properly. Could this be caused by the o2 extension harnesses? If so could I connect the front o2 sensors without the harness? Could this have anything to do with the IMRC valves or the tune itself since I have the rear o2 sensors unplugged? Any input would be appreciated, I'm hoping somebody has been in the same situation as me and resolved the issue.
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