Welcome to the North American Subaru Impreza Owners Club Wednesday September 17, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Subaru Models > Legacy Forum

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 12-10-2000, 07:03 PM   #1
Kruf
Scooby Newbie
 
Member#: 2612
Join Date: Oct 2000
Location: sparta tn us
Angry 97 2.5 GT Bucking under 2k RPM... help!

Ok, I used Gary's fix to fix the midrange light throttle hesistation, worked like a
charm, thanks Gary! Now for the other problem that has just crept up. I have a rock solid, steady idle, but at 1/2+ throttle, under 2k rpm's, my car bucks like a bronco! Anyone have any experience with this? I reset my ECU hoping it would help, but no luck. Any suggestions fellas?
Kruf is offline   Reply With Quote
Old 12-11-2000, 05:24 AM   #2
Danno
Scooby Newbie
 
Member#: 3013
Join Date: Nov 2000
Location: St. Louis, MO, USA
Vehicle:
2002 WRX Sedan
Mithril

Question

I don't have an answer to your question, but I have the same sort of problem below about 3000 rpm and was hoping Gary's fix would do it. My trouble is that my mechanic skills aren't the greatest and I don't want to get this thing taken apart any more than I'm sure I can put back together correctly. Did you have to remove the intake manifold to install Gary's fix? Did you actually remove the knock sensor from the block as per Gary's instructions, or did you leave the knock sensor in and just splice into the wire? Is there a trick to this? I'm having trouble getting at the wire and connector. The Haynes book says that in order to get to the knock sensor you have to drain the coolant, remove alternator & a/c compressor, remove intake manifold, etc., etc. Since Gary's page says "installs in minutes" I would think there's got to be a better way, but I can't figure out how. Kruf or anybody else who's done Gary's mod, I would appreciate any hints or tips.

Thanks!
Dan Crank
1997 Legacy GT Sedan
1995 Suzuki Katana 600
Danno is offline   Reply With Quote
Old 12-11-2000, 06:36 AM   #3
Patrick Olsen
NASIOC Supporter
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

Post

What is "Gary's fix"? I'm not familiar with this. Of course, I'm not sure I have anything to fix!

Pat Olsen
'97 Legacy 2.5GT sedan
Patrick Olsen is offline   Reply With Quote
Old 12-11-2000, 06:51 AM   #4
gumball
Scooby Specialist
 
Member#: 1209
Join Date: Apr 2000
Location: Wheaton, MD
Post

Patrick- Gary's "fix" is to quiet the signal from the knock sensor, b/c Subaru's TSB identified certain 97-98 ECUs that were overreacting to the signal from the knock sensor and drastically retarding the timing. The result is a low-mid range hesitation or flat spot, around 2K rpm.

His suggestions are to a) put a couple rubber donuts or other material betw. the knock sensor and the block to dampen it or b) splice in a home-made resistor, which he sells. I've used b) w/ no problems whatsoever, before that I had to re-set the ECU every week.

gumball is offline   Reply With Quote
Old 12-11-2000, 01:57 PM   #5
Patrick Olsen
NASIOC Supporter
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

Post

OK, I have heard of that before. I just bought my '97 this past weekend, haven't noticed any problems with excessive hesitation yet. I'll have to pay attention to see if I notice any problems.

Pat
Patrick Olsen is offline   Reply With Quote
Old 12-11-2000, 02:31 PM   #6
Peaty
Techno Sapien
Moderator
 
Member#: 449
Join Date: Oct 1999
Chapter/Region: MWSOC
Location: Lawrence, KS
Vehicle:
2010 Legacy 3.6R Lim
Azurite Blue Pearl

Post

The new fix is different. all it involves is disconnection the wire to the knock sensor and putting some wires in line w/ vampire taps.

Here is Gary's site:
http://home.earthlink.net/~hobiegary/hesitation.htm

And some good info from Brian's: http://members.nbci.com/_XMCM/northu.../paperclip.htm

Brian's site has the install directions from Gary.

Peaty

PS I have the kit but never installed it because I don't have the hesitation problem myself.
Peaty is offline   Reply With Quote
Old 12-11-2000, 03:24 PM   #7
Danno
Scooby Newbie
 
Member#: 3013
Join Date: Nov 2000
Location: St. Louis, MO, USA
Vehicle:
2002 WRX Sedan
Mithril

Post

Those of you who installed Gary's fix (the one with the vampire taps), were you able to do it without removing the intake manifold?

Dan
Danno is offline   Reply With Quote
Old 12-11-2000, 06:20 PM   #8
Peaty
Techno Sapien
Moderator
 
Member#: 449
Join Date: Oct 1999
Chapter/Region: MWSOC
Location: Lawrence, KS
Vehicle:
2010 Legacy 3.6R Lim
Azurite Blue Pearl

Post

I almost installed it on my car, I had the plug apart from the knock sensor and everything. It's a little tricky to get your hands in there but it's very simple to do. You won't have to remove anything. Just run the wires and tap the taps.
Peaty is offline   Reply With Quote
Old 12-13-2000, 06:51 AM   #9
SSLegacyGT
Scooby Specialist
 
Member#: 2865
Join Date: Nov 2000
Chapter/Region: NWIC
Location: CdA, ID
Vehicle:
2006 Legacy 2.5i
Wagon, 5MT, Blue

Cool

Hey-
I thought for a while that I had that hesitation problem and I was about to get garys fix, until my check engine light came on. Found out my #3 plug was faulty. I was kinda pissed cause I had dismissed my plugs as the problem seeing as I had just changed them. Anyway, I upgraded to Platinum +4's, and I get noticeably smoother acceleration from stop. Just wondering if anyone has looked into getting MSD ignition or other high performnce ingnition system installed in their suby, pros/cons?
SSLegacyGT is offline   Reply With Quote
Old 12-13-2000, 09:10 AM   #10
gumball
Scooby Specialist
 
Member#: 1209
Join Date: Apr 2000
Location: Wheaton, MD
Post

I think the TECII (they have their own forum) system uses the full-blown aftermarket MSD or similar ignition coil replacement. Probably a good thing, but friggin' expensive. I just stick w/ Torquemaster plugs & Magnecor wires.

As for the intake removal for gary's fix, yeah you really don't have to take anything apart. Though I got frustrated trying to work in such a small, hard to reach space and actually unbolted the knock sensor to get easier access to the plug and wire.

gumball is offline   Reply With Quote
Old 12-13-2000, 01:18 PM   #11
Kruf
Scooby Newbie
 
Member#: 2612
Join Date: Oct 2000
Location: sparta tn us
Unhappy

SO no one has any ideas about what is going on here? I called Trey from Cobb TUning to see if I could get any answers and he didn't know either. Do you guys know who I could contact about this? A professional scooby specialist shop anywhere? THanks...
Kruf is offline   Reply With Quote
Old 12-13-2000, 01:46 PM   #12
Jason
Scooby Specialist
 
Member#: 105
Join Date: Jul 1999
Location: Fremont, CA 94538
Vehicle:
2000 Legacy GT Ltd
WHT

Post

How old is the fuel filter?
When my fuel filter & sparke plug is about 25Kmi, the car bucked at low rpm well, around 2K rpm as well.

Hope this helps.
Jason is offline   Reply With Quote
Old 12-13-2000, 02:05 PM   #13
Kruf
Scooby Newbie
 
Member#: 2612
Join Date: Oct 2000
Location: sparta tn us
Lightbulb

Thanks for the idea, Trey just suggested the same thing, try changing the fuel filter and sparks plugs and wires becuase it can't hurt anything. If your car had the same symptoms, it sounds like a very good place to start. Everyone I have talked to about this has been extremely helpful. Thanks EVERYBODY!
Kruf is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
looking for a swaybar for my 97 2.5 gt sedan revhigh96 Legacy Forum 6 04-05-2005 03:57 PM
Any difference between a 97 2.5 gt and a 98 2.5 gt Polskino Legacy Forum 3 12-21-2003 07:51 PM
Looking at a 97 2.5 GT 80mgb Legacy Forum 1 03-07-2002 04:33 PM
97 2.5 GT Head Gasket update jsnspence Legacy Forum 15 02-16-2002 12:05 PM
97 2.5 GT Misfire cylinder 2 nightmare?!! jsnspence Legacy Forum 8 02-15-2002 10:32 AM


All times are GMT -4. The time now is 03:36 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.