If You Have A Misfire Code Please Read This! - Page 18

demid30 · 01-20-2021, 12:14 AM

So I replaced my pcv valve on Sunday and this morning, 2 days later I get a check engine light with code p0304. Do you think it's related to something with the pcv I just replaced or is it a big coincidence that it's something not related to that? So frustrating.

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subaru_gc8 · 01-20-2021, 11:37 AM

Quote:

Originally Posted by demid30

So I replaced my pcv valve on Sunday and this morning, 2 days later I get a check engine light with code p0304. Do you think it's related to something with the pcv I just replaced or is it a big coincidence that it's something not related to that? So frustrating.

nope, when was the last time you changed your plugs and coils?

demid30 · 01-20-2021, 08:08 PM

Quote:

Originally Posted by subaru_gc8

nope, when was the last time you changed your plugs and coils?

I changed all 4 plugs 50k miles ago. I just did cylinder 4 coil and I still have the code. I didn't do plug because I only have 50k on them and now I'm pissed since I had it all apart. You honestly think it can't be something with pcv.

subaru_gc8 · 01-22-2021, 12:40 PM

Quote:

Originally Posted by demid30

I changed all 4 plugs 50k miles ago. I just did cylinder 4 coil and I still have the code. I didn't do plug because I only have 50k on them and now I'm pissed since I had it all apart. You honestly think it can't be something with pcv.

chances are no, if it were it would be a general code or all the cylinders would be misfiring not just #4

demid30 · 01-24-2021, 04:10 PM

Quote:

Originally Posted by subaru_gc8

chances are no, if it were it would be a general code or all the cylinders would be misfiring not just #4

Ok so I replaced all 4 spark plugs today and I did my air filter too as it also needed replacing. The spark plugs definitely needed replacing. Cylinder 4 spark plug was noticably worse then the other 3. So I go to check code and on torque pro it already was saying that my cylinder 4 misfire was fixed, it was highlighted in green with a check mark now saying historic code, which to me means it was now fixed. I cleared anyways and started car. It fired up great and idled great but 5 minutes later CEL started blinking again, but only cel this time, no cruise control and traction control lights flashing now. So I check code and it's the same P0304. So I say to my self I better check this PCV again. I take intercooler out and get the PCV out and guess what, the valve doesn't even rattle anymore. I tried cleaning it, it starts to rattle but then it won't rattle anymore. So I have to get a new PCV but have to wait to Subaru is open. What would cause this to happen to the PCV in 2 days?

demid30 · 02-05-2021, 12:09 AM

I replaced the pcv and still have the p0304. So 4 new plugs and new coil on cylinder 4. This is frustrating, and ideas?

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01-20-2021, 12:14 AM	#426
demid30 Scooby Newbie Member#: 256620 Join Date: Sep 2010 Chapter/Region: Tri-State Location: New Jersey Vehicle: 2014 WRX 4dr!! Satin White Pearl	So I replaced my pcv valve on Sunday and this morning, 2 days later I get a check engine light with code p0304. Do you think it's related to something with the pcv I just replaced or is it a big coincidence that it's something not related to that? So frustrating. * Registered users of the site do not see these ads.

02-05-2021, 12:09 AM	#431
demid30 Scooby Newbie Member#: 256620 Join Date: Sep 2010 Chapter/Region: Tri-State Location: New Jersey Vehicle: 2014 WRX 4dr!! Satin White Pearl	I replaced the pcv and still have the p0304. So 4 new plugs and new coil on cylinder 4. This is frustrating, and ideas?