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
- - - - -

vapor lock?


  • Please log in to reply
6 replies to this topic

#1 eagleb

eagleb

    Eat, Live, Breath Subaru

  • Members
  • 255 posts
  • Beaverton

Posted 19 June 2006 - 10:06 AM

96 OBW 2.5

A few weeks ago, (which was a couple weeks after getting a new water pump and timing belt-coolant flush) the temp gauge would rise to about 3/4 of the way to hot as i got on the highway, then would settle back down after a few minutes. this happened for a few days as i commuted to work (never happened on the way home from work). I was told by some of the members on this board that it could be bubbles in the coolant that would likely work themselves out. The temp gauge doesn't rise anymore, but it seems to take a little bit longer to warm up. Also, when I first turn the car on, the idle shoots up to 1500, sometimes even close to 2000 rpm. . I am wondering if it's possible that I have vapor lock? can the symptoms just not be present during daily driving? I'm planning to take a trip over the cascade mtn range pretty soon, and I'm afraid of having an overheating nightmare, or the dreaded HG failure. Any ideas? Should I try to correct for vapor lock even if it's not an issue?

#2 1 Lucky Texan

1 Lucky Texan

    I read a lot about Subarus

  • Members
  • 4,800 posts
  • Texas

Posted 19 June 2006 - 10:25 AM

Seems like you COULD have 2-3 different problems.

I would still go ahead and try 'burping' the coolant system. Try to find a procedure by user - setright -.

Perhaps you have a bad thermostat - you didn't mention changing it.

Do you have a CEL? If so, a code might point to a problem concerning the idle at start - I suppose a bad temp sensor could be telling the ECU to choke the car. Or some kinda IACV problem.

Carl

#3 eagleb

eagleb

    Eat, Live, Breath Subaru

  • Members
  • 255 posts
  • Beaverton

Posted 19 June 2006 - 10:40 AM

tstat and gasket were changed with the tbelt. The only cel codes have been cylinder 4 misfire, which was fixed by a new injector. No codes have been thrown for weeks. I think i'll burp the coolant system just because, who knows. The tstat seems to be working fine, and the car will heat up after a few blocks, maybe that's how it's supposed to be and the last tstat was faulty. who knows. Any links to a proper coolant burping technique?

#4 OB99W

OB99W

    Elite Master of the Subaru

  • Members
  • 3,315 posts
  • Ithaca

Posted 19 June 2006 - 11:10 AM

[...]Any links to a proper coolant burping technique?

As Carl (1 Lucky Texan) suggested, here's a link to one possible approach:
http://www.ultimates...ead.php?t=28193

By the way, I assume that by "vapor lock", you're referring to an air pocket in the cooling system. Usually, "vapor lock" refers to a condition where liquid fuel has gotten so hot that it's vaporized (typically in a fuel line, pump, or carb bowl [where it's called percolation] of an older vehicle) before it should; when that happens, the engine can't run. It's not usually a problem on modern fuel-injected systems.

#5 eagleb

eagleb

    Eat, Live, Breath Subaru

  • Members
  • 255 posts
  • Beaverton

Posted 19 June 2006 - 11:16 AM

thanks for the clarification OB.

Isn't there a way to force out any air pockets without fully draining the system? I seem to remember seeing someone say that adding coolant with the engine running, with the occasional rev would do the trick. Is that not a good method?

#6 eagleb

eagleb

    Eat, Live, Breath Subaru

  • Members
  • 255 posts
  • Beaverton

Posted 19 June 2006 - 11:18 AM

thanks for the clarification OB.

Isn't there a way to force out any air pockets without fully draining the system? I seem to remember seeing someone say that adding coolant with the engine running, with the occasional rev would do the trick. Is that not a good method?



Sorry, didn't fully read the link (dummy). Thank you for the help.

#7 OB99W

OB99W

    Elite Master of the Subaru

  • Members
  • 3,315 posts
  • Ithaca

Posted 19 June 2006 - 11:35 AM

No problem, you're welcome. Page 10 of http://www.endwrench...EngineMaint.pdf has Subaru's recommended approach.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users