Welcome to the North American Subaru Impreza Owners Club Saturday March 28, 2015
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 07-26-2003, 02:49 PM   #1
schwarzenegger
Scooby Newbie
 
Member#: 37014
Join Date: May 2003
Location: Vancouver
Vehicle:
2003 WRX spec R1
Yellow

Unhappy Damn it, I think I'm running too lean...

I got a P0546 error, also known as "Exhaust gas temperature sensor circuit high input". Looks like I'm obviously running lean or is it? Strangely enough tho, this error never veered its head until yesterday under normal load... and I haven't changed anything, no mods, no nothing. It just all of sudden appeared...??? So i'm wondering if the sensor burnt up or something...

Does anybody have experience with this or have some insight on this problem? Please help! maybe the list below might help...

Current engine mods and setup:
HKS down and up both have no cats. (CEL but fixed with resistor)
GReddy EVO cat-back. (I got no cat so is it still a cat-back? haha)
GReddy MBC set at 1.2 BAR or 17 psi. (been running it, no prob)
Foam drop-in filter. (no CEL)
* Registered users of the site do not see these ads.

Last edited by schwarzenegger; 07-26-2003 at 08:21 PM.
schwarzenegger is offline   Reply With Quote
Old 07-26-2003, 03:13 PM   #2
PaulRex
Scooby Guru
 
Member#: 12454
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: Vermont
Vehicle:
10 Toyota Taco
K8 SV650SF

Default

Isn't that the code the stock EGT sensor would throw with high EGTs.. is your resistor fix you said you have for the upipe sensor, or the 02 sensor in the rear exhuast for the P0420 code?

Do you still have the stock EGT sensor in the HKS upipe? Or is the resistor fix there? If you have stock egt sensor in there, and a MBC I'm guessing that high EGTs at part throttle is triggering the code..
PaulRex is offline   Reply With Quote
Old 07-26-2003, 03:22 PM   #3
schwarzenegger
Scooby Newbie
 
Member#: 37014
Join Date: May 2003
Location: Vancouver
Vehicle:
2003 WRX spec R1
Yellow

Question

I'm trying to find out if the second O2 sensor on the downpipe is one, also a EGT sensor and two, if not then can it also trigger the P0546 error??? As far as I know, the only error that the second O2 sensor sets off is the P0420 error, also known as "Catalyst system efficiency below threshold" usually due to a blown cat or a no cat.

Quote:
Originally posted by PaulRex
Isn't that the code the stock EGT sensor would throw with high EGTs.. is your resistor fix you said you have for the upipe sensor, or the 02 sensor in the rear exhuast for the P0420 code?

Do you still have the stock EGT sensor in the HKS upipe? Or is the resistor fix there? If you have stock egt sensor in there, and a MBC I'm guessing that high EGTs at part throttle is triggering the code..
schwarzenegger is offline   Reply With Quote
Old 07-26-2003, 08:21 PM   #4
schwarzenegger
Scooby Newbie
 
Member#: 37014
Join Date: May 2003
Location: Vancouver
Vehicle:
2003 WRX spec R1
Yellow

Thumbs up This just in...

Just found out that the second O2 sensor will NOT set off the P0546 error. The part 22629AA012, otherwise known as "Sensor assem. ex. Temp" is solely responsible for this error. Also found out that once detection's been made, the sensor is most likely cooked thus requiring a new assembly. Luckly the new part isn't too expensive and easy to install but my problem still persists: Engine running too lean; EGT above threshold...

Does anyone know what idle and full load fuel pressure should I be running if I'm runnig 17~17.5 psi? I have intake, downpipe, uppipe and cat-back exhaust.

p.s. please help a.s.a.p. I am running lean, quite lean... (sensor burnt off)

p.s.II what is the safe range of EGT on WRXs?
schwarzenegger is offline   Reply With Quote
Old 07-27-2003, 12:45 AM   #5
Brahmzy
Scooby Specialist
 
Member#: 3293
Join Date: Dec 2000
Location: CO
Vehicle:
'14 FXT-T

Default

Turn down da boost.
Brahmzy is offline   Reply With Quote
Old 07-27-2003, 05:48 PM   #6
PaulRex
Scooby Guru
 
Member#: 12454
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: Vermont
Vehicle:
10 Toyota Taco
K8 SV650SF

Default

Quote:
Originally posted by Brahmzy
Turn down da boost.
I second that, especially without engine mgm't to tune the fuel map etc.
PaulRex is offline   Reply With Quote
Old 08-01-2003, 02:07 PM   #7
jcnel_wrx2k3
Scooby Newbie
 
Member#: 38268
Join Date: Jun 2003
Location: UT
Vehicle:
2003 WRX
WR Blue

Default its time

Its probably time to up the fuel pump, and go for some larger injectors, with a computer tune. That way, you can really enjoy the extra boost.

Later,

jcnel.
jcnel_wrx2k3 is offline   Reply With Quote
Old 08-01-2003, 08:00 PM   #8
WRXzard
Scooby Newbie
 
Member#: 14855
Join Date: Jan 2002
Default

You will norrmally get that code when you run 5 th gear 80 mph
for more that 5 to 10 seconds. The ETG probe goes flat line. That is what throws the code.

If you stay out of the 5 th gear 80 (changing speed ) for more that 5/ 10 second you will avoid the code. It will clear after 5 runs.

The main concern is that the probe can get toasted and flake off into the turbo. The fix is to move it to the down pipe.

I have ran for 60,000 and I'm still ok in reguards to the EGT.

Me being Mr. Dumass I floated my valves.

I have to put miles on my STI now

WRxzard
WRXzard is offline   Reply With Quote
Old 08-01-2003, 08:14 PM   #9
03WRXMA
Scooby Guru
 
Member#: 35081
Join Date: Apr 2003
Chapter/Region: NESIC
Location: CT
Vehicle:
2012 WRX
WRB

Default

Quote:
Originally posted by WRXzard

I have ran for 60,000 and I'm still ok in reguards to the EGT.

Me being Mr. Dumass I floated my valves.


How? Care to elaborate?
03WRXMA is offline   Reply With Quote
Old 08-02-2003, 12:03 AM   #10
TXBlueBeast
Scooby Specialist
 
Member#: 24494
Join Date: Sep 2002
Chapter/Region: TXIC
Location: McKinney, TX
Vehicle:
2008 Prius

Default

I just checked and I am getting this same code. All I have is Vishnu Up-pipe, Stromung Downpipe (w/high flow cat), Stromung 3rd cat eliminator pipe, and Cobb Catback. The CEL does go off after a while but just comes back on shortly.

*edit- I also have the "resistor CEL fix"
TXBlueBeast is offline   Reply With Quote
Old 08-03-2003, 01:15 PM   #11
tundra
Scooby Newbie
 
Member#: 9290
Join Date: Aug 2001
Location: Asheville, NC area
Vehicle:
02 Built 2.5L wrx

Default

The P0546 code usually means that your up-pipe O2 sensor is ready to die. If it dies your car will only run in limp mode (not fun).

This has nothing to do with high egt.... it actually means the sensor is seeing a lower egt than it is supposed to. I would pull the plug on the sensor and place a 2.2kohm resistor in it's place. Remove the probe from the uppipe and replace it with an M12x1.25 bolt.

There's been a ton of posts on this very thing. A simple search will lead to you hundreds of similar posts.

Good luck.

Edit: As a side note though, you really should turn down that boost. 17 psi is definately on the borderline of pushing the stock turbo out of its efficiency range. You'd be much safer running 15-15.5 psi, unless you are looking for an excuse to blow your engine up....

Last edited by tundra; 08-03-2003 at 01:23 PM.
tundra is offline   Reply With Quote
Old 08-03-2003, 06:01 PM   #12
0260B4U
Scooby Specialist
 
Member#: 33249
Join Date: Feb 2003
Chapter/Region: South East
Location: Jax, FL. Riverside/Avondale
Vehicle:
2003 WRX
white

Default

17 is a very bad thing on stock sytem/turbo with no management.
0260B4U 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
How do I know if I'm running too lean or too rich? Something Cool Here Newbies & FAQs 18 04-20-2010 10:55 PM
How to tell if you're running too lean/lean? 05ImprezaRS Newbies & FAQs 8 01-31-2007 01:34 AM
Is my NA car running too lean ? G.Subramaniam Normally Aspirated Powertrain 7 02-11-2005 07:36 AM
running too lean??? lubu444 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 09-25-2003 06:50 PM
Running Too Lean??? Stang2WRX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 05-06-2003 12:45 AM


All times are GMT -4. The time now is 08:06 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.