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
- - - - -

High idle on MPFI


  • Please log in to reply
2 replies to this topic

#1 Ross

Ross

    Can't be bothered

  • Members
  • 1,865 posts
  • Christchurch, New Zealand

Posted 24 December 2004 - 12:43 AM

Cant seem to adjust the idle in the ea81t to below 1000 rpm...... the adjuster screw is undone completely.
Not sure what is causing it, but i suspect the auxiliary air valve?
The valve has had its top (black plastic) snapped off at some stage, and has been glued back together. Would a hole in the glue cause the engine to rev higher than it should even when the engine is warmed up?
If anyone has a diagram of the inside of the aux air valve it would be nice.....!
any ideas?
cheers.

#2 naru

naru

    1000+ Super USER!

  • Members
  • 1,825 posts
  • under the bridge

Posted 24 December 2004 - 02:31 AM

Cant seem to adjust the idle in the ea81t to below 1000 rpm...... the adjuster screw is undone completely.
Not sure what is causing it, but i suspect the auxiliary air valve?
The valve has had its top (black plastic) snapped off at some stage, and has been glued back together. Would a hole in the glue cause the engine to rev higher than it should even when the engine is warmed up?
If anyone has a diagram of the inside of the aux air valve it would be nice.....!
any ideas?
cheers.


Sounds like you are using the throttle stop screw rather than the idle adjusting screw. The idle screw is a vertical brass one that will be turned in for lowest rpm and out for higher.

A leak at the AAV may cause a high idle.

#3 MilesFox

MilesFox

    Catch this Fox!

  • Members
  • 10,611 posts
  • Madison/Milwaukee, WI

Posted 24 December 2004 - 07:35 AM

the aav valve introduces a "false vacuum leak" when the engine is cold, and then closes off as it warms. if it is not functioning properly it may still be introducing a leak.

run the motor till its warm and try punching off the hose that leads to the intake manifold, and see if that changes the idle.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users