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
- - - - -

rough idle in 96 legacy GT


  • Please log in to reply
2 replies to this topic

#1 sc850r

sc850r

    USMB Regular

  • Members
  • PipPipPip
  • 34 posts
  • Greenville

Posted 04 July 2006 - 09:14 PM

I've read a number of threads about rough idling, but none seem to address my problem. The car idles okay when cold, but when its hot it gets really choppy, the rpms drop and it feels like it wants to stall. Otherwise, it runs well and the idle gets better when the AC comes on or I step on the gas enough to get the revs to 1000rpm. Any ideas?

#2 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,587 posts
  • Long Island NY

Posted 04 July 2006 - 10:50 PM

GRRR Year Model Mileage engine and tranny
check your idle air control motor or your mass air sensor. (is there a run on these things?). the car is fine because it is in open loop when cold. Its running off pre determined values. When the car warms up, it goes into closed loop, which is when its reading all the sensors. the IAC is a slave, meaning it takes commands from the ecu. the Air Sensor gives the ecu data to make decisons. Another possability is a bad vaccum line. (electronics not my strong point without knowing codes, im good at multiple codes)
We really need to know the other info before we start telling you ideas.

nipper

#3 sc850r

sc850r

    USMB Regular

  • Members
  • PipPipPip
  • 34 posts
  • Greenville

Posted 05 July 2006 - 05:20 PM

Thanks for the reply. When I first checked for codes ther were none- now there are. The intake manifold has failed on cylinders one and two. I guess it was a progressive deterioration. A spray of starting fluid confirms the problem. I'm not sure why it failed since its been replaced relatively recently. Oh well! Maybe its the nitrous (just kidding!).




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users