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
 

Photo
- - - - -

Knock sensor code on 2.5 to 2.2 conversion


  • Please log in to reply
7 replies to this topic

#1 Ionlyhave3suubs

Ionlyhave3suubs

    USMB is life!

  • Members
  • 179 posts
  • Virginia

Posted 03 February 2013 - 10:20 PM

I have just completed my second 2.2 conversion. Both engines came from 97 model cars. The first swap was to put a 2.2 from a 97 legacy L into a 96 LSi.
My most recent was to swap a 97 2.2 impreza outback engine into my 97 legacy outback.
After both swaps I have a check engine light indicating "knock sensor". Both were 2.5 to 2.2 conversions. I find it odd that both engines might have came with a bad knock sensor. Is this common? Did I miss something that I needed to do on my swap to prevent the CEL?
Both engines seem to run fine. I am sure there was no CEL on in the 97 Legacy outback before the swap.

#2 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 8,528 posts
  • Charlottesburg, VA

Posted 03 February 2013 - 11:05 PM

Did you remove or unplug the sensor for any reason

I would first make sure the sensor is plugged in and the pins didnt back out of the connector. Next double check the large 16 and 12 pin connectors on the bellhousing. Make sure theyre plugged in tight and the pins are all connected.

#3 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,280 posts
  • Portland

Posted 04 February 2013 - 01:02 AM

Very common to see knock sensor failures - the casing crack. I've done dozens of 2.2 swaps and it's come up on maybe one or two. You are just unlucky with knock sensors. I always choose whichever one looks better when I'm installing the engine.

GD

#4 Rooster2

Rooster2

    Subaru Master

  • Members
  • 3,551 posts
  • Indianapolis

Posted 04 February 2013 - 11:46 AM

Last year I had a used '95, 2.2 installed in my 98 OBW, after wife cooked the original 2.5 that came with the car. The shop installed the 2.2 with no knock sensor issue, so I guess it is a simple plug and play.

Suggest you replace the knock sensor, be careful not to tighten the bolt very tight, or you will crack the plastic casing around the knock sensor.

#5 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 19,674 posts
  • WV

Posted 04 February 2013 - 10:30 PM

the knock sensors fail all the time. remove it and it'll be cracked at the base.

also if it's ever been messed with it's not hard for the pin to pull right out of the connector and the connector to be compromised/not seating right.

there's a very specific technique to installing them, directions are posted on threads here. connector is supposed to be installed at a certain angle and torqued properly. i've never seen that alone cause a check engine light though but if everything else checks out...

#6 ivans imports

ivans imports

    1000+ Super USER!

  • Members
  • 2,926 posts
  • lumby bc canada

Posted 05 February 2013 - 11:03 AM

any uses for 50 bad knock sensers see many failed

#7 Ionlyhave3suubs

Ionlyhave3suubs

    USMB is life!

  • Members
  • 179 posts
  • Virginia

Posted 06 February 2013 - 10:13 PM

I have not disconnected the knock sensor or otherwise tampered with it. Are the 2.2 and 2.5 sensors interchangeable? it seems local parts suppliers list a different part number, and seems that the maybe the plug is different? Is it possible to splice the 2.2 connector onto the 2.5 knock sensor? I know at least the 2.5 sensor from my most recent swap is good. Right now I have more time than money to invest. If I can fix it with existing parts I already have, I would prefer to do that due to budget restrictions I currently have.

#8 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 8,528 posts
  • Charlottesburg, VA

Posted 06 February 2013 - 11:30 PM

They're all one wire units. Just swap the plug if you need to. It's not hard to slide the pins out.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users