2011 jeep liberty 3.7 engine fault code P0300

Asked by GuruG2N1H Aug 29, 2020 at 06:27 PM about the 2011 Jeep Liberty Sport 4WD

Question type: Maintenance & Repair

Fault code latched P0300 multiple misfires  Spark plugs and coils changed!
About an hour ago code P0304 appeared as engine was idle. Whats next to fix
this problem

3 Answers
660

Dale answered 4 years ago

I'm not sure, but I think that's your purge valve....attached to fuse box with fuel hoses and electrical connection near battery..about a $75.00 part. causes rough idle much like a misfire when it's not working right.

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Mark helpful

Gary answered 4 years ago

You may want to do a compression test. Just had same think with a 0200 it dropped the valve seat in the head

Mark helpful

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