Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

Odd misfiring on occasion

  • Please log in to reply
7 replies to this topic

#1 Speedwagon


    Eat, Live, Breath Subaru

  • Members
  • 446 posts
  • Denver, CO

Posted 17 September 2017 - 07:36 PM

98 Legacy GT, with a 95 EJ22 swapped in.


Every so often, the engine will just start to misfire and run very rough with no power. If I shut the engine off, then turn it back on, everything is fine again. It started over a year ago, but almost never did it. In the past 2 months, it's done it more often. It does not flash the CEL when this is happening.


And since I can't figure the source of this misfire, here 2 other things the engine is doing:


When going down a hill, and engine braking, then getting on the throttle, it smokes for a bit burning off some oil. I suspect valve stem seals for this.

It is also using a bit of oil, which could be tied to the valve stem seals.

Edited by Speedwagon, 17 September 2017 - 07:38 PM.

#2 wtdash


    Subaru Nut

  • Members
  • 1,581 posts
  • N. ID

Posted 18 September 2017 - 01:59 PM


I'd still check for codes...cel or not.

Check your Grounds?

ECU/ECM going bad?

PCV valve - related to oil issue?

#3 Speedwagon


    Eat, Live, Breath Subaru

  • Members
  • 446 posts
  • Denver, CO

Posted 22 September 2017 - 03:00 PM

Bought a Subaru pcv valve today, going to put that in later. Read the codes, had more than I thought. The EJ22 doesn't have an egr, so the light is always on. Read and reset them.

301(cyl 1 misfire), 302(cyl 2 misfire), 325(knock sensor), 403(egr), 420(low catalyst efficiency), 1507(idle air control).

1507 seems like the only one that could be a cause and not a symptom.

Edited by Speedwagon, 22 September 2017 - 03:06 PM.

#4 Mike104


    Subaru Fanatic!

  • Members
  • 690 posts
  • N KY

Posted 22 September 2017 - 03:19 PM

Clear the codes and see which ones come back first.  The misfires and knock sensor codes could be causing your issues.  Manual or Auto?  I had the P1507 and it was related to the Neutral switch (MT).

#5 Speedwagon


    Eat, Live, Breath Subaru

  • Members
  • 446 posts
  • Denver, CO

Posted 22 September 2017 - 06:31 PM


#6 Fairtax4me



  • Members
  • 12,973 posts
  • Charlottesburg, VA

Posted 23 September 2017 - 01:04 PM

Inspect the knock sensor. Replace it if it's cracked.
How old are the spark plugs? Copper plugs usually wear out in about 30k miles.

#7 Speedwagon


    Eat, Live, Breath Subaru

  • Members
  • 446 posts
  • Denver, CO

Posted 23 September 2017 - 06:47 PM

Plugs are probably due. I think I did them at 275k. It's a bit over 300 now.

#8 golucky66


    Subaru Nut

  • Members
  • 568 posts
  • Barkhamsted Connecticut

Posted 23 September 2017 - 07:31 PM

Imo. If you ever get a knock sensor code. Inspect the harness. And then replace the sensor and harness if the harness is damaged.
Honestly. They go bad after a while. 95% if people have sucess with cheap 10$ ones.

But you NEED that code to go away. That will cause the ecm to add more fuel and retard timing.

Edited by golucky66, 23 September 2017 - 07:32 PM.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users