Question about 2004 Subaru Outback

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06 outback with 57,000 miles got codes p0301 and p0302. cylinder misfires on 1 and 3. Trying to narrow down if it's the coil or plugs/wires. Any help greatly appreciated. !!

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6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: Cylinder 1 misfire on my subaru!!

What you should check first is the spark plug for the #1 cylinder and see if there is a white film on it this would be a sign of a coolant leak which would cause a problem with the O2 sensor

Posted on Oct 11, 2008

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Anonymous

  • 321 Answers

SOURCE: misfire code

Many things can cause a misfire,but basic mechanical checks or tests can be made relatively inexpensively.Compression testing the cylinders with a compression gauge will verify the general condition of the engine's piston rings and valve sealing capabilities.A leakdown test is similar to a compression check except that a leak down test is directed more towards verifying specifically the valve's sealing capabilities.A valve can burn or a bad seal occur between valve and seat...causing a misfire.Valves and piston rings are mechanical in nature,but there are many other possible causes.Vacuum leak,ignition problems,fuel problems,sensor problem,etc etc.Good luck.

Posted on Sep 11, 2008

Anonymous

  • 1 Answer

SOURCE: miss fire in cylinder #1, 1998 subaru legacy outback

fuel injectors getting ground from pcm?

Posted on Nov 24, 2008

gordanddar

gord storey

  • 477 Answers

SOURCE: I have a 1997 Subaru Legacy Outback AWD. The

when you replaced the plugs , was one of them (cylinder 1 ) dirty and fouled ?
I'm thinking that bad rings in cylinder would give you low compression , and eventualy cause the missfire by fouling up the plug.
There is an inexpensive product that will help with the compression by filling up scratches in the cylinder walls. It is called Restore , and it is one of the only products of its type that I have used , and feel actually works.
Unfortunately , if your rings are broken , or badly worn , nothing in a bottle will fix them.

If your car had a distributor cap and rotor , I would change them too.

Posted on May 13, 2009

BCAS1298

Alexander Mimun

  • 3092 Answers

SOURCE: #3 cylinder miss in a 1997 subaru outback 2.5

Do a cylinder compression test.

Posted on Jan 04, 2010

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P0302 - Cylinder 2 Misfire Detected,what needs to be done.


Fritz, Clear codes, Plugs and coils try switching them around, not using the same cylinder, to see if code changes to different cylinder. this would help diagnose bad coil or plug. See links below for full instruction. I have had this code come up because of a bad/dirty fuel injector also. Last link tells what other reasons code could be thrown.
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