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 Technical > Normally Aspirated Powertrain

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 04-05-2009, 06:50 PM   #1
mtntrekker30
Scooby Newbie
 
Member#: 158173
Join Date: Sep 2007
Default Car losing power on acceleration

I have a 99 OBS with 135,000 miles, manual transmission, new plugs/wires/airfilter/clutch/timing belt. My car seems to have a loss of power when I'm trying to accelerate (1000-2300 RPM). As I progress through higher (2300 and greater) RPM the power seems to come back.

I just moved from Salt Lake (elevation about 4500 ft) to Pennsylvania (about 1400 feet) a few months ago. I'm wondering if elevation change may have something to do with it or possibly the gas they sell here. I've changed everything I can think of.

Any thoughts are greatly appreciated.
* Registered users of the site do not see these ads.
mtntrekker30 is offline   Reply With Quote
Old 04-05-2009, 07:01 PM   #2
chazly413
Scooby Specialist
 
Member#: 151079
Join Date: Jun 2007
Chapter/Region: MAIC
Location: College Park, MD
Vehicle:
2005 2.5RS RBP
motec system exhaust-RIP

Default

I just downshift if I need to accelerate and I'm in that range.
chazly413 is offline   Reply With Quote
Old 04-05-2009, 07:12 PM   #3
Vizzionz
Scooby Specialist
 
Member#: 139109
Join Date: Jan 2007
Chapter/Region: RMIC
Location: Southern Colorado
Vehicle:
2007 Impreza 2.5i
Crystal Gray Metallic

Default

have you reset the ecu?
Vizzionz is offline   Reply With Quote
Old 04-05-2009, 07:20 PM   #4
mtntrekker30
Scooby Newbie
 
Member#: 158173
Join Date: Sep 2007
Default

No I didn't reset the ECU. If disconnecting the battery for 2 hours counts for a reset then yes I have.

Any other thoughts are appreciated. Thank you for yours
mtntrekker30 is offline   Reply With Quote
Old 04-06-2009, 12:05 AM   #5
Back Road Runner
Scooby Guru
 
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2004 Forester STI
Silver

Default

The low range on a stock engine just doesn't have much power there. You just aren't anywhere near your peak torque band till above that. If you want better bottom end, look at grabbing a set of 8mm phenolic spacers from Grimmspeed. It noticeably bumps up low end torque. It technically shouldn't do much of anything from the relatively tiny bump in runner length, but it does. For me, that and an aftermarket exhaust header were the two things that significantly bumped up low rpm response.

Just don't expect massive power down that low unless you do modifications to the car that specifically promote low rpm use.
Back Road Runner is offline   Reply With Quote
Old 04-06-2009, 12:10 AM   #6
Baja820
Scooby Newbie
 
Member#: 196860
Join Date: Dec 2008
Chapter/Region: NWIC
Location: Runnin bootleg booze.
Vehicle:
2014 TAKE OFF
YOU HOSER!!!

Default

Is your dash lighting up with cels? .... my RS is doing the same thing. I think its the o2 sensor gone bad..... Im gonna change it out tomorrow ill let you know how it goes.
Baja820 is offline   Reply With Quote
Old 04-06-2009, 12:11 AM   #7
Blase
Scooby Newbie
 
Member#: 54702
Join Date: Feb 2004
Chapter/Region: MWSOC
Location: Chicago area
Vehicle:
2000 impreza 2.5rs
brp

Default

disconnecting your battery for 2 hours should definitely reset your ecu.
Blase is offline   Reply With Quote
Old 04-06-2009, 02:03 AM   #8
Counterfit
Scooby Guru
 
Member#: 124254
Join Date: Aug 2006
Chapter/Region: NESIC
Location: Rhode Island
Vehicle:
2006 06 SGM Slowbaru
"The Scoobinator"

Default

Quote:
Originally Posted by Blase View Post
disconnecting your battery for 2 hours should definitely reset your ecu.
It shouldn't even take anywhere near that long. My ECU reset in the time it took me to replace my headlight bulbs.

If you're really impatient, step on the brake pedal after you disconnect the battery.
Counterfit is offline   Reply With Quote
Old 04-09-2009, 07:27 PM   #9
mtntrekker30
Scooby Newbie
 
Member#: 158173
Join Date: Sep 2007
Default thanks everyone for the replies

My thanks to everyone for the responses. Wondering how things went with replaceing the O2 sensor.

If anyone has any other thoughts please let me know.

Thanks again everyone.
mtntrekker30 is offline   Reply With Quote
Old 04-09-2009, 08:01 PM   #10
Back Road Runner
Scooby Guru
 
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2004 Forester STI
Silver

Default

It's not his O2. You know when that's bad, and you will quickly very well understand the difference between open and closed loop operation.
Back Road Runner is offline   Reply With Quote
Old 04-09-2009, 09:45 PM   #11
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

the problem is that you're driving below 2K rpm. You should only be near 1K in first gear.
yarrgh is offline   Reply With Quote
Old 04-11-2009, 07:29 AM   #12
mtntrekker30
Scooby Newbie
 
Member#: 158173
Join Date: Sep 2007
Default

The problems I'm having are only in 1st and 2nd gear---any higher gears are not a problem. I've been careful to watch at about which RPM I'm shifting. Usually shift from 1st to 2nd at about 3000-3300 RPM which leaves me at about 1900 RPM when I engage the clutch after shifting to 2nd gear. Again after I break the 2300 RPM mark the power seems to come back.

Again thanks to everyone who has replied.
mtntrekker30 is offline   Reply With Quote
Old 04-11-2009, 11:37 AM   #13
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

have you been driving this way for a while or is this something recent that has popped up? try holding 1st gear up to 3500-4K. You don't have to mash the gas, just hold it longer. Most NA engines don't wake up until higher RPM's. We need flow velocity to make more power, and at low revs, it doesn't happen.

And you should get more power at lower elevations. Try porting your headers just a tad, I've heard that the stock ones aren't that great for smooth flow.
yarrgh 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
Car loses power Tiller35 Newbies & FAQs 11 04-27-2010 07:03 PM
Car seems to lose power Tiller35 Factory 2.0L Turbo Powertrain 0 04-26-2010 10:39 PM
car loses COMPLETE power BoXinWRX Factory 2.0L Turbo Powertrain 22 09-23-2009 10:20 PM
car losing power soobyfan Service & Maintenance 12 12-05-2003 04:13 PM
Car hiccups occasionally on acceleration? Fred Fredburger General Forum Archive 18 01-07-2001 12:40 AM


All times are GMT -4. The time now is 09:26 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.