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Old 11-03-2019, 12:53 PM   #1
Scooby Newbie
Member#: 401531
Join Date: Sep 2014
2015 WRX Premium

Default Code P0301 intermittent problem. HELP!

Hey Guys. Working on my daughter's car 2009 Impreza 2.5.

Problem: Car randomly misfires to a point where car stalls. It'll start back again but runs so rough that it can't be driven. It'll store a P0301.

So far I've replaces spark plugs, wiring harness were tested and good but put in new ones anyway. Tested Cyl 1 and 3 injectors, both came out good. I swapped injectors to see if I'd get a code on Cyl 3. After doing all that , for some reason the car ran perfect for 1 week but last night problem came back again with same P0301 code. I let it sit all night, and this morning all is good again. went for a ride and it runs like new.

Strange note: car doesn't leak oil , but when the problem comes back, there is always an oil spill on floor and I can't see where it's coming from.

Hope someone can help...thx
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