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
- - - - -

84GL diesels on shutdown


  • Please log in to reply
5 replies to this topic

#1 RedRat

RedRat

    USMB Regular

  • Members
  • PipPipPip
  • 37 posts
  • Bellingham

Posted 22 December 2006 - 04:42 AM

Hey everbody,

My 84 GL just doesn't know when to quit. It has a problem, dieseling I believe its called, on shutdown the engine likes to sputter sputter and not die for a few seconds (sometimes more like 5-7 seconds). Then when it does die, it coughs really bad out of the air filter. Its been doing this for a few weeks now. Not everytime, but too often.

It has a weber carb that I have been tinkering with (idle is steady at 1000, choke is set really low becuase it was getting stuck and idling at 2000, and mixture is, well, mixed:).

It also has a MSD coil and wires, and Bosch plugs that are the recommended types for a stock setup. Also a new distributer cap/rotor. The dieseling started about a month after I put in the new ignition.

Do you think that switching to cooler plugs will help? Could there be a short in the ignition?

Also, when I pulled the old plugs, I notice to my horror that the #1 cylinder plug threads are all torn up, and I barely got the new plug seated. Now I am pretty nervous about replacing it, or I guess I am just putting it off a proper repair. Has anybody ever mixed and matched plugs on these babies. I am thinking 3 of the cooler plugs and the one stock plug. This doesn't sound right to me, but I thought I'd throw it out there.

All in all, I love my 84 GL. She's skookum (tough) and reliable and fun. Tommorow I am going to drive down to Oregon (350 miles) and I don't have any worries. Until I turn off the motor, that it is!!!

thanks and happy hollerdays

-redrat owner in bham wa

#2 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,279 posts
  • Portland

Posted 22 December 2006 - 04:51 AM

Reduce your idle speed to 700-800, bring the timing back a degree or two (will help with the too-high idle), and adjust the idle mixture properly. It's all about the fine adjustments to stop the deiseling. You get the hang of it eventually. My first try with a Weber I had that problem for a while too. You need to get the idle to where it's running ENTIRELY with the idle circuit, and the throttle plate is closed.

You do have the vacuum advance hooked to the ported carb vacuum port and not the manifold right? Manifold vacuum will cause the idle timing to be way too high.

GD

#3 RedRat

RedRat

    USMB Regular

  • Members
  • PipPipPip
  • 37 posts
  • Bellingham

Posted 22 December 2006 - 05:17 AM

Reduce your idle speed to 700-800, bring the timing back a degree or two (will help with the too-high idle), and adjust the idle mixture properly. It's all about the fine adjustments to stop the deiseling. You get the hang of it eventually. My first try with a Weber I had that problem for a while too. You need to get the idle to where it's running ENTIRELY with the idle circuit, and the throttle plate is closed.

You do have the vacuum advance hooked to the ported carb vacuum port and not the manifold right? Manifold vacuum will cause the idle timing to be way too high.

GD



Hey thanks for the quick reply GD. The vacuum advance is hooked up to a port on the carb that in just below and foreward of the choke body. It is right near the base of the carb, but I'm not sure if thats the manifold or what.

I will lower my idle to 7 or 8 and back the timing off a degree or two before my trip tommorow, and let you know if that helps.

#4 RedRat

RedRat

    USMB Regular

  • Members
  • PipPipPip
  • 37 posts
  • Bellingham

Posted 24 December 2006 - 03:19 PM

Yeah, so lowering the idle to 800 and setting the timing down a few notches seems to have done the trick. The RedRat has died on command every single time since! Thanks G.D.!

#5 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,279 posts
  • Portland

Posted 24 December 2006 - 05:46 PM

No problem. It's annoying to have that dieseling.

GD

#6 RedRat

RedRat

    USMB Regular

  • Members
  • PipPipPip
  • 37 posts
  • Bellingham

Posted 25 December 2006 - 02:42 AM

Yeah, that dieseling would make me cringe everytime it happened. It was pretty bad. Now the redrat is much happer and dies on commmand. Yay.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users