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After driving 30-40 miles the engine starts misfiring, the check engine light turns on for all cylinders and code P0300?

Tiny
BHAMDOC1973
  • MEMBER
  • 2013 MINI COOPER S
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 107,000 MILES
Car drives perfect the after 30-40 miles it starts misfiring and check engine light comes on for all cylinders plus p0300. You delete it and everything is back to normal. I changed the PCV seal because it's common but that was not it, I guess. Spark plugs look good.
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Wednesday, August 3rd, 2022 AT 9:58 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,512 POSTS
This can either be a dirty or worn out MAF sensor or the fuel filter getting plugged up which is in the tank. You can try to clean the MAF but that sometimes doesn't work here is a guide to help you also I have included the MAF location and how to change the fuel filter out.

https://www.2carpros.com/articles/mass-air-flow-service

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Wednesday, August 3rd, 2022 AT 4:33 PM
Tiny
BHAMDOC1973
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  • 1,667 POSTS
107k hard to believe a filter is bad, but I will clean the MAF first and see. Thanks
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Wednesday, August 3rd, 2022 AT 4:46 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,512 POSTS
You may have gotten a bad tank of gas which can take out the filter. Also, on the MAF sensor cleaning doesn't always work but it is worth a try, let me know.
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Thursday, August 4th, 2022 AT 6:35 PM

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