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 and poor acceleration


  • Please log in to reply
4 replies to this topic

#1 viceversa

viceversa

    Subaru Fanatic!

  • Members
  • 368 posts
  • Virginia

Posted 04 November 2003 - 12:28 PM

1992 Loyale, 1.8L SPFI, 3-speed, 185,000 miles

First, the power steering pipe got loose, and all the fluid burst out of there. I didn't know and drove like that for maybe 60 highway miles. I did notice that turning was different, harder and I knew it had something to do with it but I wanted to get home first.

Next, I add some regular power steering fluid. Then I realize it takes Dextron ATF fluid but haven't drained it yet. Right now when I turn, it makes these noises.

The next day, the idle is rough, the tach is jumping up and down and acceleration is poor and it does accelerate in a strange fashion, the tach kind of moves up and down.

I am only writing about the above power steering because the fluid was sprayed over everything in the engine bay and I wonder if it got somewhere where it shouldn't be. Or could it be that the power steering pump is gone and it somehow interferes with driving?

But, it does sound like an ignition problem and just happened to coincide with above. What could it be? I am ruling out EGR valve and O2 sensor, I think these make a difference at higher speeds, not at idle/15mph. Could it be the catalytic converter? The car has 185K miles on the body and parts, 90K on the engine and 20K on tranny. Even if EGR/O2 sensor are bad, it is doubtful they are root cause because this happened so suddenly.

The other thing that I did before this idle/acceleration started, I checked compression in the cylinders and I accidently left a brass fitting from the end of the compression tool hose screwed in the cylinder. Then I screwed in the spark plug into that fitting, with the plug wire and tried to crank the engine. It made this strange noise. I realized the plug didn't look right - it sat too far out, so I removed it, then unscrewed the compression tester fitting and re-installed everything correctly. (After this BTW, the compression tool ceased to work and registers 0 on all cylinders.)

Could I have messed up my timing somehow? I get knocking at higher speeds which I didn't have just the day before? Does bad timing cause rough idle?

Also, I replaced the big rubber thing (Air intake) which fits on top of the throttle body, which says "Subaru FI" in big letters. The old one was cracked on top.


P.S. I think it might be missing, because the exhaust sounds a bit different, sometimes irregular.

#2 soobme

soobme

    Subaru Master

  • Members
  • 1,871 posts
  • Medford OR

Posted 04 November 2003 - 01:13 PM

It's poss. that the TPS got contaminated with the PS fluid, but it sounds more like igntion than anything else. I would check the timing, and make sure that all the plug wires are secure @ each end. Bad timing can give U the high end knock, and mess up your idle reall bad.
If U have any vacume leaks any where, or a leak in the air intake hose, it could have sucked in enough of the power steering fluid to foul out a spark plug too. I would pull them all and have a look at 'em.

#3 viceversa

viceversa

    Subaru Fanatic!

  • Members
  • 368 posts
  • Virginia

Posted 04 November 2003 - 01:20 PM

I will be darned -- I pulled the plugs as it just had to be ignition and found out that I bent one of the spark plugs so that there was no gap _at all_. I gapped it to 0.040 per owner's manual and it runs great, as well as 1.8L can run. (their range was 0.039-0.043")

I don't know how it happened, I don't recall dropping it.

I think I am going to check the other 3 plugs.

Thankfully.

#4 soobme

soobme

    Subaru Master

  • Members
  • 1,871 posts
  • Medford OR

Posted 04 November 2003 - 02:06 PM

Right on! Glad to hear it turned out eazy for ya!

#5 viceversa

viceversa

    Subaru Fanatic!

  • Members
  • 368 posts
  • Virginia

Posted 04 November 2003 - 02:46 PM

Yeah, I do appreciate it. It is a good thing changing spark plugs on Subaru's is a piece of cake (compared to some other vehicles).




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users