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08-05-2020, 01:01 PM | #1 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
Code P0303 after valve cover gasket replacement
Hi, I'm looking for some feedback as to what may be causing a P0303 cylinder misfire code on my 2005 RS. I got multiple cylinder misfire codes a few weeks ago due to an oil leak that eventually affected the spark plugs. So, after new valve cover gaskets, new spark plugs and a new spark plug wire set I'm still getting the same code after driving for a while. The car drives fine, there's no loss of power or any other thing like what happened before the repair.
I understand the mechanic told me an injector may be failing, but since he's not a Subie specialist he's not completely sure. So, besides a possible injector issue, what else could be the cause or causes? Thanks for any help given!
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08-06-2020, 12:56 PM | #2 |
Scooby Specialist
Member#: 118334
Join Date: Jun 2006
Chapter/Region:
SWIC
Location: IT'SOKIFYOUDON'TGETIT!
Vehicle:2006 Red GDA-F 2005 Aspen White GDA-E |
Were the plugs and wires that were purchased, OEM? Or were they aftermarket units? Has the Coil ever been changed?
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08-06-2020, 01:23 PM | #3 |
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region:
RMIC
Location: Denver
Vehicle:2001 2.5RS Black Diamond Pearl |
incorrect valve lash can contribute. Does the 2005 have a vacuum source on the intake runner on cyl 3? Could be vacuum leak. Swap the injector with another cylinder, observe behavior.
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08-06-2020, 02:25 PM | #4 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
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08-06-2020, 02:26 PM | #5 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
Don't know about the vacuum source, but I'll do some research and keep your suggestion in mind. Thanks!
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08-06-2020, 02:30 PM | #6 | |
Scooby Specialist
Member#: 118334
Join Date: Jun 2006
Chapter/Region:
SWIC
Location: IT'SOKIFYOUDON'TGETIT!
Vehicle:2006 Red GDA-F 2005 Aspen White GDA-E |
Quote:
I had terrible luck with Aftermarket plugs and wires on my 05RS, I went to OE and all the issues went away. But I understand where you're at, the difficulty in obtaining Genuine stuff. |
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08-06-2020, 04:41 PM | #7 |
Scooby Newbie
Member#: 487057
Join Date: Jun 2018
Chapter/Region:
BAIC
Location: California
Vehicle:2002 WRX Wagon PSM |
Did you reset the code after the repairs?
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08-06-2020, 04:43 PM | #8 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
Yeah, difficult as in going local to get them. Buying them in the US is not an issue except for the wait.
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08-06-2020, 04:45 PM | #9 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
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08-09-2020, 10:59 PM | #10 |
Scooby Newbie
Member#: 445600
Join Date: Apr 2016
Chapter/Region:
Tri-State
Location: SE PA
Vehicle:2002 Outback Sport Green |
Did you replace the spark plug tube seals at the same time as the valve cover gaskets?
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08-10-2020, 08:38 AM | #11 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
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08-16-2020, 12:49 PM | #12 |
Scooby Newbie
Member#: 445600
Join Date: Apr 2016
Chapter/Region:
Tri-State
Location: SE PA
Vehicle:2002 Outback Sport Green |
Sometimes a valve guide can drop and cause a misfire. If you lower the exhaust manifold and look into the exhaust ports, you'll be able to see if a guide has dropped.
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08-19-2020, 09:52 PM | #13 |
Scooby Newbie
Member#: 104264
Join Date: Jan 2006
Chapter/Region:
PRSIC
Location: Puerto Rico
Vehicle:2005 Impreza RS Silver |
Thanks for the tip! This would be a bit more involved, so when I find a trusty Subaru mechanic I'll tell him.
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