Welcome to the North American Subaru Impreza Owners Club Friday August 22, 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 > Built Motor Discussion

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 04-08-2013, 12:53 PM   #1
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default idle issues. built 2.1stroker

Ok so sometimes ONLY at idle i have the following problems.

1. One time only this happened. The car was a warm start and idle had dropped low to 500 then as it raised the boost gauge raised up to 1psi ish and then the car rev'd to 3k and then settled back down to normal idle of 1k rpms. All in all lasted maybe 5seconds max

2. The cars idle ONLY at idle will sometimes jump a few 100rpms and hang there a bit and then drop back down. Usually once the car is fully warmed up it will do this. This is not constant but does happen daily.

Iacv has been removed and cleaned with new oring installed.

MAF has been removed and cleaned.

Front O2 sensor has been replaced and Afs all read normal.

An ecu reset has been done at every part cleaning or replacement.

For those that do not know i have a built 2.1 stroker. Stock heads.

Any info would be appreciated.

As a side note of minor concern is it normal to see full boost at part throttle and the check eng will blink but not save the data for me to read it? Would this be a issue with the tune?

Thanks!
* Registered users of the site do not see these ads.
cosseywrx is offline   Reply With Quote
Old 04-10-2013, 08:56 PM   #2
Bamofo
Scooby Specialist
 
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:
07 STI Limited
TurboMike Tuned 2.35

Default

Did you check the tune. It changes idle and timing plus af target based on coolant temp... Just a thought.
Bamofo is offline   Reply With Quote
Old 04-15-2013, 08:44 PM   #3
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Im aware of this. It was retuned when it was built. Just ruling aout all mechanical or electronic issues first.
cosseywrx is offline   Reply With Quote
Old 04-15-2013, 09:23 PM   #4
majik1
Scooby Newbie
 
Member#: 255841
Join Date: Aug 2010
Location: Fort Huachuca, AZ
Vehicle:
2005 WTX STi
white

Default

Have you checked for any vacuum leaks??
majik1 is offline   Reply With Quote
Old 04-15-2013, 09:35 PM   #5
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Yes. Even sprayed the motor with carb cleaner while it was running. No change in idle was noticed/heard/seen.
cosseywrx is offline   Reply With Quote
Old 04-15-2013, 09:36 PM   #6
bigolrig
Scooby Specialist
 
Member#: 185347
Join Date: Jul 2008
Chapter/Region: MWSOC
Location: Lexington, OH
Vehicle:
2002 EVO3 bugeye wag
EG33 Swapped 2 dr RS

Default

Intake manifold to tgv, tgv to head or maybe fuel injector o-rings?
bigolrig is offline   Reply With Quote
Old 04-15-2013, 09:55 PM   #7
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Injector o rings are new. Like i said. I sprayed everything.
cosseywrx is offline   Reply With Quote
Old 04-15-2013, 09:57 PM   #8
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

This all started i started to clean the maf. Replaced front o2 and cleaned the iacv. All are installed correctly and sealed perfectly.

Im not downing any ideas. I want all thoughts before looking at retune.
cosseywrx is offline   Reply With Quote
Old 04-16-2013, 12:09 AM   #9
majik1
Scooby Newbie
 
Member#: 255841
Join Date: Aug 2010
Location: Fort Huachuca, AZ
Vehicle:
2005 WTX STi
white

Default

I know this sounds exactly like mine dude with the wandering idle and the bogging to low idle, that is why I say to find a buddy with a smoke tester and put it on the im where the fuel rail vent is...
majik1 is offline   Reply With Quote
Old 04-16-2013, 09:59 PM   #10
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Smoke test was good. No leaks found. Smoke test more than 1 spot to make sure.
cosseywrx is offline   Reply With Quote
Old 04-18-2013, 01:33 AM   #11
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

My main problem persist.

Its running lean at idle adding 18-25% extra fuel.

I unplugged the o2 and it does the exact opposite. Runs rich and -18-25% fuel.

Any body know whats going on? Most likely the tune is the problem?
cosseywrx is offline   Reply With Quote
Old 04-18-2013, 06:56 AM   #12
Bamofo
Scooby Specialist
 
Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:
07 STI Limited
TurboMike Tuned 2.35

Default

Sounds like the tune. Do you hav access to the rom? I can take a quick look
Bamofo is offline   Reply With Quote
Old 04-18-2013, 08:50 AM   #13
aboothman
Scooby Specialist
 
Member#: 127745
Join Date: Oct 2006
Chapter/Region: NWIC
Location: Humboldt County
Vehicle:
06 WRX 30r 6 speed
99L EJ255 6 Speed

Default

Injectors? Rhinking one may be stuck/sticking intermittently.
aboothman is offline   Reply With Quote
Old 04-18-2013, 11:17 AM   #14
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

I really dont think injectors because the issue got worse when i replaves the o2 sensor (front).
cosseywrx is offline   Reply With Quote
Old 04-18-2013, 03:22 PM   #15
Xcrave
Scooby Newbie
 
Member#: 351592
Join Date: Mar 2013
Chapter/Region: International
Location: Ottawa, ON
Vehicle:
1999 RSTI Ver. 6
WRB

Default

I think it's the tune. I'm running in my EJ207 an EJ257 crank and it did that for awhile cause it wasn't tuned imo
Xcrave is offline   Reply With Quote
Old 04-18-2013, 03:29 PM   #16
Power-Division
NASIOC Manufacturer
 
Member#: 337895
Join Date: Nov 2012
Location: In your HEAD
Default

how does it run off idle? drives fine, boosts fine, hauls ass?
Power-Division is offline   Reply With Quote
Old 04-18-2013, 09:10 PM   #17
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

Yes yes and hell yeh!
cosseywrx is offline   Reply With Quote
Old 04-18-2013, 09:10 PM   #18
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

I will link my build thread within the hour.

http://forums.nasioc.com/forums/show....php?t=2312759
my build

Last edited by cosseywrx; 04-18-2013 at 09:43 PM.
cosseywrx is offline   Reply With Quote
Old 04-19-2013, 07:09 PM   #19
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

looks as-if the MAf just need some scaling. i really appreciate the help from Bamofo!
cosseywrx is offline   Reply With Quote
Old 04-19-2013, 11:31 PM   #20
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

i learned to scale the Maf myself and got it between AF learned -0.78 and +0.78.

thanks for all the help and suggestions
cosseywrx 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


All times are GMT -4. The time now is 02:15 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.