Welcome to the North American Subaru Impreza Owners Club Sunday July 13, 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 > Engine Management & Tuning

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 02-06-2006, 04:44 PM   #1
HorsepowerFreaks
Vendor
 
Member#: 57501
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Portland, OR
Default Tumbler deletes with UTEC= 2k RPM idle....

A friend of mine had me take out his tumbler valves, weld up the outer holes, and port match them. He went to fire the car later and it would idle at 2k rpms... we checked for vacuum leaks...nothing. I believe its directly related to the fact we took out the shafts. What modifications/adjustments do we need to do to get the car to idle? Version 1.1 software on a 04 USDM STi. (I'm going to get him the 4.2 software here shortly)

Any suggestions? or UTEC revisions we should take note of? THank you.

(yes I searched)

-Eric
* Registered users of the site do not see these ads.
HorsepowerFreaks is offline   Reply With Quote
Old 02-06-2006, 04:51 PM   #2
x99percent
Scooby Specialist
 
Member#: 27108
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: Detroit-ish, MI
Vehicle:
2004 STi
2004 A4

Default

Why blame it on the UTEC?

Do any other mods on the car prevent the car from being started *without* the UTEC?

Also, the latest version of UTEC firmware for the STi is 1.1c, NOT 4.2.
http://www.turboxs.com/stiupdate.htm
x99percent is offline   Reply With Quote
Old 02-06-2006, 05:11 PM   #3
cdvma
Scooby Specialist
 
Member#: 21980
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Central MA
Vehicle:
2002 PSM WRX (Sold)
2009 BMW X5

Default

Check your IAC functionality and throttle body plate.
cdvma is offline   Reply With Quote
Old 02-06-2006, 06:03 PM   #4
bboy
Scooby Specialist
 
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

2K idle is indicative of electonic throttle problem.
bboy is offline   Reply With Quote
Old 02-06-2006, 06:12 PM   #5
HorsepowerFreaks
Vendor
 
Member#: 57501
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Portland, OR
Default

ok that narrows it down. Thanks for the hint on the 1.1c!

Thing I did notice...the "drive by wire" tb WHINES something fierce with the car on acc. when you disconnect it...the whine goes away. we didnt modify the stock tb, tb plate, or IAC. I understand it all points there, but what exactly are the possiblilities? I mean...if the tb and IAC are connected and are not plugged or restricted then there *should* be no problem.

yeah we have 816cc injectors...which I dont think the factory ecu would be able to idle.

What about this... he had me *also* weld his MAF into his charge pipe(post intercooler and bov) The change in diameter would throw that WAY off IMO...and "could" be the source of the problem. It was originally teh TurboXS IC piping (2.5" OD) and he had it tuned previously for the GPMoto Intake. If this is the problem..which, to me, seems that it is(quite evident) how do I "calibrate" the MAF sensor with the UTEC? is this a simple procedure listen in the UTEC manual?

here's a picture of the bay when i was finished working on it. Note where the MAF and bov are and their respective locations.


Last edited by HorsepowerFreaks; 02-06-2006 at 06:26 PM.
HorsepowerFreaks is offline   Reply With Quote
Old 02-06-2006, 08:07 PM   #6
chucky
Scooby Newbie
 
Member#: 26972
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Montreal
Vehicle:
2007 WRX STI
White Pearl / Gold wheels

Default

what fuel rail are you using? They look like subydude +1 ?
chucky is offline   Reply With Quote
Old 02-07-2006, 01:23 AM   #7
HorsepowerFreaks
Vendor
 
Member#: 57501
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Portland, OR
Default

yeah its teh suby dude rails
HorsepowerFreaks is offline   Reply With Quote
Old 02-07-2006, 10:19 AM   #8
x99percent
Scooby Specialist
 
Member#: 27108
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: Detroit-ish, MI
Vehicle:
2004 STi
2004 A4

Default

Quote:
Originally Posted by cdvma
Check your IAC functionality and throttle body plate.
DBW cars don't have an IAC valve.
x99percent is offline   Reply With Quote
Old 02-07-2006, 04:39 PM   #9
cdvma
Scooby Specialist
 
Member#: 21980
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Central MA
Vehicle:
2002 PSM WRX (Sold)
2009 BMW X5

Default

Quote:
Originally Posted by x99percent
DBW cars don't have an IAC valve.
Interesting to know, thanks. I honestly didn't read much of the post. I saw 2k idle. A vacuum leak would be HUGE to do that and it would run like crap.
cdvma 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
'03 wrx idles high at 2k rpm. guy_in_red_wrx Factory 2.0L Turbo Powertrain 13 07-14-2009 12:29 AM
UTEC: MAF voltage at idle and @ 2k rpms HorsepowerFreaks Engine Management & Tuning 2 02-08-2006 06:16 PM
Need help with Tumbler deletes and CEL leadfoot Factory 2.0L Turbo Powertrain 8 01-24-2006 08:33 AM
tumbler deletes with injector plate onyxhunter Private 'For Sale' Classifieds 0 08-31-2004 04:43 PM
Rough idle, lack of power under 2k rpm... madsedan Forester Forum 2 05-19-2004 10:47 PM


All times are GMT -4. The time now is 12:46 AM.


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.