Welcome to the North American Subaru Impreza Owners Club Wednesday April 16, 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 > Open Source Reflashes

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 05-25-2011, 09:03 PM   #51
Subey03
Scooby Specialist
 
Member#: 159909
Join Date: Sep 2007
Chapter/Region: BAIC
Location: Arkansas Little rock..current
Vehicle:
2004 STI on AIR
PSM

Default

having same problem...with a 03 wrx drove to work parked as shutting off i see a check engine light pop up.....after work start it up...idles at around 2k then drops 1k and goes back up to 2k repeating this same process....the exhaust sounds like it has a slight sputter.....pulled maf no difference just a slight stumble when reconnected.

any ideas lol?

code is heater circuit low input or something
* Registered users of the site do not see these ads.
Subey03 is offline   Reply With Quote
Old 05-25-2011, 09:41 PM   #52
poly_poly-man
Scooby Newbie
 
Member#: 262988
Join Date: Nov 2010
Chapter/Region: Tri-State
Location: Rochester Institvte of Technor
Vehicle:
2002 WRX Wagon
WRB

Default

Quote:
Originally Posted by Subey03 View Post
having same problem...with a 03 wrx drove to work parked as shutting off i see a check engine light pop up.....after work start it up...idles at around 2k then drops 1k and goes back up to 2k repeating this same process....the exhaust sounds like it has a slight sputter.....pulled maf no difference just a slight stumble when reconnected.

any ideas lol?

code is heater circuit low input or something
bad o2 sensor.
poly_poly-man is offline   Reply With Quote
Old 05-27-2011, 10:01 AM   #53
SVT_WRX
Scooby Specialist
 
Member#: 164830
Join Date: Nov 2007
Chapter/Region: SCIC
Location: San Diego
Vehicle:
2002 WRX
G61 III OVE 58e

Default

You can try replacing the TPS. If that doesn't work...idk...timing belt skipped a tooth? Wild timing swings? Could be...
SVT_WRX is offline   Reply With Quote
Old 05-29-2011, 03:30 PM   #54
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

So I tried replacing the TPS but that didnt solve my swinging timing and idle problem. I tried messing around with things and with the TPS unplugged everything seemed great. My timing was rock solid at 23.5 deg. So if the sensor itself isnt the issue then I am thinking wiring or what am I avoiding in the ECU calculations with the TPS unplugged. Is it not using the MAF for calcs and instead the MAP? I know my AF trims are maxed and thats not good but try to ignore that for arguments sake since that didnt change from TPS plugged in to unplugged. I need to rescale but didnt before this log. Please does anyone understand what is going on!?
WRX-17 is offline   Reply With Quote
Old 05-29-2011, 07:01 PM   #55
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

Here's the Log
Attached Files
File Type: zip Idle with TPS unplugged.zip (41.3 KB, 9 views)

Last edited by WRX-17; 05-30-2011 at 12:24 AM.
WRX-17 is offline   Reply With Quote
Old 05-30-2011, 02:46 PM   #56
SVT_WRX
Scooby Specialist
 
Member#: 164830
Join Date: Nov 2007
Chapter/Region: SCIC
Location: San Diego
Vehicle:
2002 WRX
G61 III OVE 58e

Default

Don't know what unplugging the TPS does. Is it a brand new TPS? Did you get it from the dealer?

You need to address those corrections...asap...you can't just ignore that...

I also thought I had asked you to post pictures of your intake setup. You haven't yet. Do it.

What is the condition of your spark plugs and coils? Take them out and check them....don't just look at them from the outside and think everything is ok.

Also clean the coil and harness electrical connections with CRC electrical harness cleaner.
SVT_WRX is offline   Reply With Quote
Old 05-31-2011, 11:24 AM   #57
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

Well I want to figure out what the ECU does when unpluggin the TPS because my car runs great with it unplugged. No it is not a brand new from the dealer TPS it was a TGV sensor which is identical. And that hasnt made a difference in the idle so its not the sensor. I replaced the plugs so thanks for insinuating Im a dumbass. If you want to see my intake setup so bad I told u I have the perrin rotated turbo and FMIC with the bigmaf tube. Not hard to find. I will clean the coil and connections.

I am going to update my original post with the things I have done to my car to try solving the problem.
WRX-17 is offline   Reply With Quote
Old 05-31-2011, 05:09 PM   #58
SVT_WRX
Scooby Specialist
 
Member#: 164830
Join Date: Nov 2007
Chapter/Region: SCIC
Location: San Diego
Vehicle:
2002 WRX
G61 III OVE 58e

Default

Not insinuating, just trying to be thorough, so don't get your panties in a bunch. I'm trying to help you, chief...

I wanted to see the position of your MAF...so guess I'll google your intake setup.

And yes, an update to the first post is a great idea...
SVT_WRX is offline   Reply With Quote
Old 06-09-2011, 01:28 AM   #59
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

So I have continued updating my first post and I just pressure tested the intake sytem. I did find some small things to take care up like a crack in my boost tube and possibly a very small leak around the maf but these did not solve my problem and were too small of leaks. I am running out of things to try so can anyone please chime in? Thank you
WRX-17 is offline   Reply With Quote
Old 07-16-2011, 03:15 PM   #60
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

Just thought I would give an updated to my lack of a solution.


Parallel Fuel Rail Mod: No change
Replace injector O-rings and grommets: No change
Replace Injectors: Put some stock injectors back in so that I am sure of the scaling and latencies in order to correctly scale the MAF, No change
Crank or Cam sensor: Ruled out crank sensor and cam sensor, no result
Rear O2 Sensor: Shouldnt affect much on my 16bit ECU but unplugging it did nothing and voltages seem fine


Please please please if anyone has any other suggestions for me, I really could use it!! I just dont understand it. Here are a couple new logs at idle that I find interesting. I tried unplugging the MAF sensor again while logging to look for anything strange and in doing so, things seemed to run nicer and when plugging it back in it almost dies but unplugging it it keeps running no problem and my timing is solid on target at 11-12. take a look at the log, does it seem to say that my MAF is bad?

What does this say? Can anyone give me any feedback please?
Attached Files
File Type: zip Idle Log.zip (94.9 KB, 3 views)
WRX-17 is offline   Reply With Quote
Old 08-02-2011, 10:16 PM   #61
scootarida1
Scooby Newbie
 
Member#: 154534
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: Wilkes-Barre, PA
Vehicle:
2005 Forester XT
Borg Warner S261

Default

I have the same problem, rotated setup and the awkward idle. On mine im wondering if there is some sort of turbulence messing up the maf readings. unplug the maf and idle is perfect. Are you experiencing and stalling after letting out the clutch to go into netural. I really need to pin point this problem because its bothering me.
scootarida1 is offline   Reply With Quote
Old 08-03-2011, 01:25 AM   #62
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

Im glad I am not the only one, what is the maf housing that you have an where is it located (blow thru)? My car isnt stalling anymore but there was a point where that was a problem as well. Can you watch you timing at idle and take a long so I can compare yours with mine?
WRX-17 is offline   Reply With Quote
Old 08-03-2011, 07:28 AM   #63
scootarida1
Scooby Newbie
 
Member#: 154534
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: Wilkes-Barre, PA
Vehicle:
2005 Forester XT
Borg Warner S261

Default

Yeah its like an oscillation idle as if its constantly searching. The A/F goes from 12 to 17 and keeps cycling. It does it while cruising at 2000rpms or lower as well and you can feel the car bog as it cycles through. I can't currently log right now but when I get my buddys tactrix we are going to log and send it back and forth through the tuner. But anyways my maf is not blow thru its before the turbo but i do have some of the vaccum lines coming back into the intake like stock did but I'm wondering if the location of them is messing with the maf. Its a 3" i.d. tube so I'm wondering if at these low rpms its messing with the maf and over these rpms that there is enough air flowing past that it isnt really bothering these turbulences. By the way these lines are right undernenth the maf. I wonder if I could test this somehow.
scootarida1 is offline   Reply With Quote
Old 08-03-2011, 10:46 AM   #64
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

What are some things you have tried to resolve the problem? Once you are able to log you should definitely take a log at idle and post it up here or email it to me so I can see if I really am having the same problem you are with the erratic timing and AFRs. That is interesting that you don't have a blow-thru but might have maf reading interference, its possible
WRX-17 is offline   Reply With Quote
Old 08-03-2011, 01:40 PM   #65
scootarida1
Scooby Newbie
 
Member#: 154534
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: Wilkes-Barre, PA
Vehicle:
2005 Forester XT
Borg Warner S261

Default

I havent really had time to diagnose it since i just got tuned last weekend. He even said he cant get it to stop stalling. I tried to put a bov tightened down so it wont leak but that didnt work. Also its not blow through because its still tmic. I do want to set up some sort of boost leak and vaccum leak test. I will probably make some sort of pvc thing and pressurize it for the boost and then use the propane torch method for the vaccum and see if I can find anything. If I get around it today I will unplug the front o2 and see if my A/F's straighten out on my wideband but I also do plan on making another intake with the vaccum hoses in a different spot and see if that helps. I'm just worried that the tuner might have tried to tune it out and anything I try wont help.
scootarida1 is offline   Reply With Quote
Old 08-19-2011, 05:51 PM   #66
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

My MAF sensor is fine since I was just able to try out a friends and it made no difference. I am completely out of ideas.
WRX-17 is offline   Reply With Quote
Old 02-25-2012, 02:59 AM   #67
cosseywrx
Scooby Specialist
 
Member#: 276443
Join Date: Mar 2011
Chapter/Region: TXIC
Location: Abilene, TX
Vehicle:
2005 2.1 stroker WRX
OBP

Default

sorry to bump but im having the same trouble? did you ever fine a solution?
cosseywrx is offline   Reply With Quote
Old 03-06-2012, 04:35 PM   #68
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

Unfortunately I was never able to figure out the problem. I switched to an AEM EMS and I no longer have problems. I have no idea what that means, but my guess is that it just does a much better job at keeping the timing and idle stable and set on the numbers you have in the map. It doesn't have any emissions stuff either so thats a possibility. I heard an sti with the idle like mine the other day and it reminded me of my problems and I am glad I no longer have it, but wish I knew the real reason why
WRX-17 is offline   Reply With Quote
Old 08-08-2012, 12:08 AM   #69
XLR8T
Scooby Newbie
 
Member#: 266684
Join Date: Dec 2010
Default

Your last video you posted said it all to me:

W--T--F is your BOV doing making sounds at IDLE?!

You aren't generally making enough boost pressure to sound that thing off till your at like 3k under load or using launch control....

My vote is leaky BOV. I've heard of the HKS and multiple others leaking and causing all kinds of issues - including inability to idle correctly.

Lemme know if this fixes your issue!
XLR8T is offline   Reply With Quote
Old 08-08-2012, 12:14 AM   #70
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

It wasnt that because I tried capping off the line to the bov essentially making it impossible for the bov open and it didnt change anything. It was only doing that because the spring was too light. And my maf is way after the bov on the other side of the intercooler so there is no way it couldve been affecting the readings. But I appreciate you trying to finally solve this ghost of a problem!
WRX-17 is offline   Reply With Quote
Old 08-08-2012, 10:27 PM   #71
tebriel
Scooby Newbie
 
Member#: 244190
Join Date: Apr 2010
Location: Madison, WI
Vehicle:
2004 BRP WRX Wagon
2004 JBP WRX

Default

you capped off the vac line going to it? That wouldn't be enough, you'd have to remove the bov and put a plate there instead, completely eliminating the bov.
tebriel is offline   Reply With Quote
Old 08-08-2012, 11:35 PM   #72
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

actually it would be enough with atmospheric pressure + spring pressure is greater than the pressure being put out by the turbo, but it doesnt even matter because on my application it doesnt affect anything since the maf is no where close to the bov like I explained.
WRX-17 is offline   Reply With Quote
Old 08-10-2012, 12:34 PM   #73
boykinjw
Scooby Newbie
 
Member#: 328705
Join Date: Aug 2012
Location: Charleston, SC
Vehicle:
2006 WRX
Black

Default

Quote:
Originally Posted by WRX-17 View Post
actually it would be enough with atmospheric pressure + spring pressure is greater than the pressure being put out by the turbo, but it doesnt even matter because on my application it doesnt affect anything since the maf is no where close to the bov like I explained.
I agree they are not physically close to each other but they both are before the throttle plate. What he was trying to say is your MAF is measuring the air coming into your motor but your BOV is leaking out the measured air at idle before it gets to the throttle plate. Which means the computer thinks you have a certain amount of air and and sends in the appropriate amount of fuel for the correct mixture. But when you leak air in your system after the MAF then the air/fuel mixture is wrong and your car could be running rich which is causing your poor idle. Sounds like you got it fixed with something else though so good job.
boykinjw is offline   Reply With Quote
Old 08-10-2012, 01:01 PM   #74
WRX-17
Scooby Newbie
 
Member#: 98725
Join Date: Oct 2005
Chapter/Region: SCIC
Location: Irvine, CA
Vehicle:
05 WRX
Aspen White

Default

Wow. Ok I guess I have to quote myself..."And my maf is way after the bov on the other side of the intercooler so there is no way it couldve been affecting the readings."

The MAF is after the BOV so the metered air was right before the throttle body and was reading the correct amount of air going into the engine since the bov was pre-maf. I dont know how to explain myself better here...
WRX-17 is offline   Reply With Quote
Old 08-10-2012, 01:20 PM   #75
the suicidal eggroll
NASIOC Supporter
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by WRX-17 View Post
Wow. Ok I guess I have to quote myself..."And my maf is way after the bov on the other side of the intercooler so there is no way it couldve been affecting the readings."

The MAF is after the BOV so the metered air was right before the throttle body and was reading the correct amount of air going into the engine since the bov was pre-maf. I dont know how to explain myself better here...
Some people just don't understand how a blow through MAF works...
the suicidal eggroll 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
CEL P0171 - bad MAF or O2 sensor....or something else? Heider Factory 2.0L Turbo Powertrain 17 05-22-2009 05:28 PM
WTB: wrx coil(4), MAF, rear o2 sensor 98gc8 Private 'Wanted' Classifieds 0 01-22-2008 08:37 PM
MAF Or O2 sensor? pilfflip Legacy Forum 13 08-03-2007 02:53 PM
WTB: MAF, Intake, O2 Sensors, AP v1 04-05, Sway Bars vinceGC8 Private 'Wanted' Classifieds 4 02-22-2007 01:35 AM
WTB: MAF, Intake, O2 Sensors, AP v1 04-05, Sway Bars vinceGC8 SCIC Private Classifieds 3 02-21-2007 04:25 PM


All times are GMT -4. The time now is 03:43 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.