Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 11-23-2009, 04:04 PM   #1
SHAG SCOOB
Scooby Newbie
 
Member#: 230828
Join Date: Nov 2009
Location: L.A., CA AND YOUR MOM'S CRIB
Vehicle:
STI. FXT. EVO8.
WRX. RSTI. GF8.

Default got an sti ecu update and the car keeps getting slower

I originally brought my 07 sti in for an oil change for the first time and got the car back and it felt slower. I thought it was my imagination at first. Then later on i was getting some service done and told the dealer i was having an issue that under 3/4 acceleration i was getting boost surges on and off. They told me there was a software update that they can perform to fix that. When i got the car back it felt punchy and i realized that the car was slower after the first visit to the dealer and now seemed to be as good as when i first got it. Then it quickly tapered off and now is slower than ever with almost no pull on the freeway. I used to get a surge of boost now it just feels like a nothing. I think they might have done an update that first time but i dont know. The recent ecu update was about 3 months ago. I brought it back a few days ago and they said they couldnt find anything wrong plus there is no way to remove an update. Will resetting the ecu (with the neg wire removed then stepping on the brake) work to set it back to factory spec or do the updates stay. Also, i have an aem cai, if the filter is dirty will that cause that much resriction? I thought this could be an issue, but with the instant changes that the ecu update caused made me think programming was the problem. Thanks alot for any help.
* Registered users of the site do not see these ads.
SHAG SCOOB is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-24-2009, 04:15 AM   #2
misfitracer25
Scooby Specialist
 
Member#: 213101
Join Date: Jun 2009
Chapter/Region: NWIC
Location: somebody poisoned
Vehicle:
the waterhole!

Default

Im pretty sure most CAI are bad news on wrx and sti without a aftermarket pro tune. Your motor could be cutting timing or boost because you ran it to lean. Maybe remove CAI and get a leakdown test?
misfitracer25 is offline   Reply With Quote
Old 11-28-2009, 11:37 AM   #3
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

1-Either dump the CAI & go back to stock intake or get a tune for the CAI.
2-When the dealer did the reflash, it clears ECU learning, this may allow full boost until the ECU gets pissed off and kills boost.
3-Clearing the ECU (like by disconnecting the battery) will NOT clear any programming, it will only clear ECU learning.
Charlie-III is offline   Reply With Quote
Old 11-28-2009, 12:40 PM   #4
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Denver
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

Was the CAI put on after the dealer reflash? with that new of a car, you need a tune for ANY modification.
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
Help my car keeps getting rich AFR jhull UTEC 8 04-12-2010 06:18 PM
anyone got a pic of an STI up-pipe and the bolts/nuts that go with it? Beeker Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 1 02-03-2006 07:14 PM
*UPDATE* Well, I finally joined the dark side and got an STI! Leonardo Member's Car Gallery 84 11-29-2004 11:19 AM
I got an STi in the family R-one Alaskan Impreza Club Forum -- AKIC 4 07-31-2003 04:38 PM
I bought an STI part today and my car is faster 2003 sedan Texas Impreza Club Forum -- TXIC 6 01-03-2003 09:56 PM

All times are GMT -4. The time now is 02:57 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.