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
- - - - -

Solved - Idle with AC on too high


  • Please log in to reply
4 replies to this topic

#1 suburpy

suburpy

    Soob Goob

  • Members
  • PipPipPip
  • 101 posts
  • Adelaide

Posted 09 March 2006 - 05:21 PM

My 84 wagon (EA81, electric dizzy) is idling fine at 800 RPM and was idling at 950 with AC on. It has just started running at 1200 rpm idle when the AC is on. I noticed that when I put AC both of the (factory) electric fans come on as well - would this increase RPM. I thought it would draw current and drop the RPM a little (ie when the thermoswitch trips the fans without the AC on the RPM drops about 50). What could cause this RPM increase - the relay?, switch, Electronic components in the dizzy? Help me, my wagon is mint and I want it good, it is a one owner (21 yrs) full subaru service history and only 120,000 kms (75K miles) - oh and it is 38 Celsius (100 F) and a balmy 42 (107 F) predicted tomorrow - good thing I got a brand new radiator from the JY for $16 - beauty.

#2 subiemech85

subiemech85

    SIX STAR SERVICE

  • Members
  • 2,710 posts
  • down by the river

Posted 09 March 2006 - 06:00 PM

there may be a vac. operated device that pulls a lever on the carb to increase engine speed

#3 naru

naru

    1000+ Super USER!

  • Members
  • 1,818 posts
  • under the bridge

Posted 09 March 2006 - 06:23 PM

My 84 wagon (EA81, electric dizzy) is idling fine at 800 RPM and was idling at 950 with AC on. It has just started running at 1200 rpm idle when the AC is on. I noticed that when I put AC both of the (factory) electric fans come on as well - would this increase RPM. I thought it would draw current and drop the RPM a little (ie when the thermoswitch trips the fans without the AC on the RPM drops about 50). What could cause this RPM increase - the relay?, switch, Electronic components in the dizzy? Help me, my wagon is mint and I want it good, it is a one owner (21 yrs) full subaru service history and only 120,000 kms (75K miles) - oh and it is 38 Celsius (100 F) and a balmy 42 (107 F) predicted tomorrow - good thing I got a brand new radiator from the JY for $16 - beauty.


There is a vacuum thingy (FICD) that opens the throttle a little w/AC on.Set the AC idle speed by loosening the locknut and turning the adjustment screw w/AC on.

#4 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,281 posts
  • Portland

Posted 09 March 2006 - 06:42 PM

Perhaps your AC clutch is not engaging. The AC idle-up would then make the idle too high as it is expecting to have to drive the compressor.

There should be an AC pressure switch that will not allow the compressor to engage unless the system is pressurized with the correct amount of refrigerant. Perhaps you have sprung a leak.

Both fans are supposed to come on with the AC - normal.

GD

#5 suburpy

suburpy

    Soob Goob

  • Members
  • PipPipPip
  • 101 posts
  • Adelaide

Posted 09 March 2006 - 07:28 PM

Solved - thankx USMB, subiemech, naru and as always GD. It was indeed the vacuum adjustment. I didnt mention I had just rebuilt carby after dirt in petrol Again!!! (Outback service stations) GRRR!! Must have gone on differently adjusted, all is good now. Learning something like this about my car is why I love these forums.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users