Welcome to the North American Subaru Impreza Owners Club Monday December 11, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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. 
Thread Tools Display Modes
Old 10-23-2005, 08:37 PM   #1
*** Banned ***
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC
Default Help!!! White smoke after resinstallation of stock injectors

Today I reinstalled stock injectors 550cc yellow side feeds back into my STI. I'm running Utec and I've had the Perrin modifieds in there for a few months. Since running the Perrins I've been getting a misfire cell (P301) on cylinder 3 but never had it until I put the Perrin modifieds in. Other than having to reset the cell with a scanner, the car had been running and idling great. Today I decided to reinstall the stock sized injectors back in because I've been worried about repeatedly getting the P301 cell.
So right after reinstalling brand new oem sti injectors, I reset the Utec by removing the 100amp fuse and waited a few minutes. I started the motor and white smoke started to billow out of the exhuast and a lighter amount near the coolant resevior. I've visually inspected the area, no disconnected hoses or plugs. What the hell could it be? After resetting the Utec a couple times more and restarting the motor, I'm still getting the white smoke and then a cell of P172 shows up. Anyone know what this code is? I've seen other threads about white smoke occuring after simple downpipe installs.

Please anyone with this experience please help.
* Registered users of the site do not see these ads.
calib17a is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-23-2005, 09:00 PM   #2
Scooby Specialist
Member#: 44572
Join Date: Oct 2003
Chapter/Region: NESIC
Location: Woburn, MA
2005 STi
Built and Ported


P0172 is system too rich bank 1. could you have installed an injector without or maybe a broken o-ring causing is to spray fuel without stopping. ive never had this problem but i hope that helps.
beavis820 is offline   Reply With Quote
Old 10-24-2005, 03:33 AM   #3
*** Banned ***
Member#: 64150
Join Date: Jun 2004
Chapter/Region: SCIC

I took a break then I decided to put the Perrin modifieds back in. I did not see any broken o rings on the stock injectors upon removal. After reinstalling them I rescaled the injectors to 840cc on my Utec's Open loop fueling section. Open loop fueling was set to 1, which enables open loop fueling. Then I disconnected the battery and waited a few minutes. I turned the motor on noticed it stopped idling as rough as when I had the 550cc injectors in. Before, the motor at idle had heavy shaking, a sided to side movement alot more than normal and would want to die after blipping the throttle .

I took the car for a test drive around the block and had clouds of the white smoke out of the exhaust, but throttle response was alot better. I went back home and left the car running in my driveway for 5 minutes. There was less smoke out of the exhaust and still some coming out near the area of the coolant resevior and turbo. I then took another test drive around the block. There was definitely less smoke. I decided to take a cruise on the freeway. On the on-ramp I went WOT to 65mph and drove for approximately 15 miles, got off an exit and proceeded to drive back home. I had Utec on olf Stage II and throttle response was back to normal, white smoke disappeared.

I had sold my stocks to a nasioc member and purchased a brand new set from another nasioc member. There may be some type of recalibration procedure that needed to be done to the new injectors or maybe once the injector scaling is changed on the Utec it cannot be reverted to original to 550cc scaling? Or I may not have reset the Utec properly, although I had my map switch set to 0, which is the default setting for stock STi map. I don't exactly know why it did this , but I'm relieved it's performing back to normal.

Any feed back of what could have happened is welcome.
calib17a is offline   Reply With Quote
Old 10-24-2005, 03:54 AM   #4
Scooby Guru
Member#: 7327
Join Date: Jun 2001
Chapter/Region: NWIC
Location: Seattle, WA
2008 Mazdaspeed3
2006 Wrangler Sport


You could be seeing a variance of flow rates for stock injectors.

I have seen flow tests for STi EJ257 fuel injectors reflecting flow rates of 480, 520, 535, and 540cc. Perhaps the injectors you have are flowing differently than what you think they are. Did you try scaling the injectors to a different (higher or lower) number than 550 on your UTEC?

If, for example, your stock injectors were 480's and the new injectors really are 550, you are now getting 15% more fuel than expected. We know the injector scaling numbers are not precise... the important thing is the difference between the stock and scaled numbers.

Last edited by nhluhr; 10-24-2005 at 04:05 AM.
nhluhr is offline   Reply With Quote

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
Lots of white smoke after hard ride NEED HELP! svt04cobra Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 2 12-23-2007 12:17 PM
Please help ASAP! White smoke after VF39 upgrade Matth3w Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 28 12-05-2007 03:14 PM
White smoke after PCV cleaning? wrxstiracer04 Newbies & FAQs 3 05-01-2006 11:29 AM
white smoke after 4th gear WOT toekneeyo Newbies & FAQs 2 05-01-2006 02:19 AM
White Smoke after Mods ?! makofoto Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 2 07-12-2004 01:42 PM

All times are GMT -4. The time now is 08:22 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.