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
- - - - -

Hitachi Electric Choke Question???


  • Please log in to reply
9 replies to this topic

#1 jk4138

jk4138

    USMB is life!

  • Members
  • 129 posts
  • Spokane

Posted 20 November 2006 - 10:27 AM

So I finally got my newly rebuilt Hitachi dialed in right on my 87 GL Wagon so it is running right and idling smoothly at about 800 rpms when warm. The only problem I am having is the fact that it still is hard to start first thing in the morning. I just replaced the carb with a rebuilt one and the choke seemed to work initially. I have 12V to the choke itself when the car is running but it does not want to close at all in the morning. What would be causing this to happen? I have thought about checking the function of another choke that I have from a junkyard carb and swapping them out. Any suggestions would be much appreciated because it is starting to getting me really frustrated.

#2 Frank B

Frank B

    Subaru Master

  • Members
  • 2,226 posts
  • VA

Posted 20 November 2006 - 10:47 AM

If I remember correctly, the 12v is to heat the bimetal coil inside the choke to open the choke. 12v will not be applied untill the engine is running, as it runs and warms up, the 12v element in the chike heats up the bimetal coil, thermostat basically, and it expands, turning the choke shaft to open it. Take you old one and carefully open it up. there should be rivets or screws holdint the round cover in place, remove them but hold the cover in place. Now trun the cover in one direction or the other, that will increase or decrease the spring load on the coil and open or close the choke. You should get a good idea of how it works then. Now while your engine is stone cold, like it is in the morning, do the same to the carb on the car. Turning it to close the choke plate, but just enough to close it. You don't want to go too far past the point that it is closed. You may not have to close it all the way either for the engine to start.
There may also be an issue with the linkage. With it stone cold, open the throttle completely while watching the choke, it should close as soon as it's opened, I think. I can't remember if your year soob requires the throttle opened to close the choke like the olde ones do.

#3 jk4138

jk4138

    USMB is life!

  • Members
  • 129 posts
  • Spokane

Posted 20 November 2006 - 10:55 AM

Thanks for the help. Does anyone else have any suggestions?

I did rotate the choke some before I put on the air filter housing by rotating it backwards towards the spare tire. That however was not when the engine was cold.

#4 jk4138

jk4138

    USMB is life!

  • Members
  • 129 posts
  • Spokane

Posted 20 November 2006 - 12:14 PM

Does anyone have knowledge on the electric choke on the Hitachis or is this a great unknown?

#5 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,279 posts
  • Portland

Posted 20 November 2006 - 04:11 PM

Do what Frank sugested.

Unfortunately, the EA82 Hitachi choke's are junk - the end of the spring wears through and falls off. It's possible the rebuilders missed it.

GD

#6 jk4138

jk4138

    USMB is life!

  • Members
  • 129 posts
  • Spokane

Posted 20 November 2006 - 04:21 PM

So should my choke plate close by applying the throttle and then slowly open once it is running due to the 12V that is heating up the spring inside the choke? The reason I ask is because the choke plate is not closing at all when I apply the gas before attempting to start it. Thanks

#7 jk4138

jk4138

    USMB is life!

  • Members
  • 129 posts
  • Spokane

Posted 20 November 2006 - 05:15 PM

Do any of you guys know what it is that makes the choke plate stay closed after pressing down on the accelerator?

#8 Frank B

Frank B

    Subaru Master

  • Members
  • 2,226 posts
  • VA

Posted 20 November 2006 - 05:31 PM

I think the spring inside the plastic choke housing does that, but I can't remember if it's internal or its external on the hitachi. I don't have one in front of me at the moment.

#9 jk4138

jk4138

    USMB is life!

  • Members
  • 129 posts
  • Spokane

Posted 20 November 2006 - 05:49 PM

That is kinda what I was thinking. I noticed that on the backside (closest to intake on the carburetor) of the choke housing there is an extremely small piece of wire sticking out on a spare Hitachi carburetor that I have. Is that where the spring is attached in order to build tension? If that is the case I should be able to see if the wire is still sticking out and if not than that would show that it has broken?

#10 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,279 posts
  • Portland

Posted 20 November 2006 - 06:27 PM

You will have to remove the choke housing. The spring is a spiral wound bi-metal type, and does not have any "wire" holding it in place. The hook end that engages the choke lever wears though and falls off.

The choke plate should be closed when cold, and slowly opens as the spring heats.

GD




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users