Welcome to the North American Subaru Impreza Owners Club Wednesday August 27, 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 > Factory 2.5L Turbo Powertrain

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 05-05-2011, 05:40 PM   #26
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by dan1587wrx View Post
Does this mean that the car will stall out due to the backfire or because the injectors turn off.
No, the injectors turn back on when you reach ~1200 RPM to catch the engine at idle.
* Registered users of the site do not see these ads.
the suicidal eggroll is offline   Reply With Quote
Old 05-06-2011, 12:36 PM   #27
Operanal
Scooby Newbie
 
Member#: 127249
Join Date: Sep 2006
Location: NJ
Vehicle:
2006 WRX Limited
Black

Default

Quote:
Originally Posted by Clark Turner View Post
When you go from high rpm to idle like that or if the engine stalls like in your case, You take the oil flow away from the motor and turbo... ITs hard on the engine.
C
If you're right, then I've been a bad boy for quite some time. Taking yours (and everyone else's advice), I started keeping the car out of neutral as much as possible to minimize the stall-outs. After a leisurely 40 minute highway drive last night, the car once again began its idle rev flutter after 5 minutes on local roads. I tried to keep the car from stalling by gently revving the engine at stoplights. After a few minutes of this, the car threw a CEL, the oil light came on, and the car went into limp mode (rev limit at 3000rpm, no boost pressure). The car must have detected the Subaru dealership down the block, which is where the car is now.

I will post back with the dealer diagnosis, but the problem only comes on after running for a while, so possibly a heat-related problem?

If the turbo starts to go, can it potentially obstruct the intake path, causing low idle RPM?
Operanal is offline   Reply With Quote
Old 05-06-2011, 12:41 PM   #28
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by Operanal View Post
If you're right, then I've been a bad boy for quite some time. Taking yours (and everyone else's advice), I started keeping the car out of neutral as much as possible to minimize the stall-outs. After a leisurely 40 minute highway drive last night, the car once again began its idle rev flutter after 5 minutes on local roads. I tried to keep the car from stalling by gently revving the engine at stoplights. After a few minutes of this, the car threw a CEL, the oil light came on, and the car went into limp mode (rev limit at 3000rpm, no boost pressure). The car must have detected the Subaru dealership down the block, which is where the car is now.

I will post back with the dealer diagnosis, but the problem only comes on after running for a while, so possibly a heat-related problem?

If the turbo starts to go, can it potentially obstruct the intake path, causing low idle RPM?
The scariest part about this story is the oil light coming on. The oil light is not triggered by the ECU, it's a complete stand-alone sensor/light circuit, that ONLY turns on when the switch closes (or the wire is shorted out). If that light came on, your oil pressure dropped below 3 psi, and if the engine was still running at the time, it's probably done for.

It's possible the low pressure threw off the AVCS system, the ECU saw that the cam position was incorrect, so it put the car in limp mode.
the suicidal eggroll is offline   Reply With Quote
Old 05-06-2011, 12:43 PM   #29
143subaru
Scooby Specialist
 
Member#: 157982
Join Date: Aug 2007
Chapter/Region: MWSOC
Location: Warrenton, MO
Vehicle:
2002 Impreza WRX
World Rally Blue

Default

Quote:
Originally Posted by the suicidal eggroll

The scariest part about this story is the oil light coming on. The oil light is not triggered by the ECU, it's a complete stand-alone sensor/light circuit, that ONLY turns on when the switch closes (or the wire is shorted out). If that light came on, your oil pressure dropped below 3 psi, and I hate to say it, but your engine is probably done.

It's possible the low pressure threw off the AVCS system, the ECU saw that the cam position was incorrect, so it put the car in limp mode.
:-( For his sake I hope your wrong... Don't think you are... But hope...
143subaru is offline   Reply With Quote
Old 05-07-2011, 02:53 PM   #30
Operanal
Scooby Newbie
 
Member#: 127249
Join Date: Sep 2006
Location: NJ
Vehicle:
2006 WRX Limited
Black

Default

Dealer service manager says the problem is the electronic throttle control relay, after all. Supposedly it's somewhat common, he told me.

Hopefully that's the end of the story; I'll report back in a week to confirm.
Operanal is offline   Reply With Quote
Old 05-11-2011, 12:18 PM   #31
Operanal
Scooby Newbie
 
Member#: 127249
Join Date: Sep 2006
Location: NJ
Vehicle:
2006 WRX Limited
Black

Default

Quote:
Originally Posted by Operanal View Post
Dealer service manager says the problem is the electronic throttle control relay, after all. Supposedly it's somewhat common, he told me.

Hopefully that's the end of the story; I'll report back in a week to confirm.
No dice. Same symptom happened again this morning after successfully driving the car home from the dealership last night.

One interesting thing I noticed. I left the car off on the side of the highway for 10 minutes after it got into this limp mode. When I restarted it, the car drove fine for a few miles until I made it onto the off-ramp; then the car went back into limp mode. Signs are pointing to something heat-related... Any thoughts?

Dan, I'm sorry if I hijacked your thread. I just thought because my car is bone stock with the same symptoms as your car, it would be somewhat easier to narrow down the cause of our mutual problem.
Operanal is offline   Reply With Quote
Old 05-12-2011, 12:10 AM   #32
ojala
Scooby Newbie
 
Member#: 255441
Join Date: Aug 2010
Chapter/Region: TXIC
Location: FW
Vehicle:
05 Saabaru

Default

What would you typically look at in a log to differentiate different boost/vac leaks at idle? I mean beyond fuel corrections that is.

Last edited by ojala; 05-12-2011 at 12:16 AM.
ojala is offline   Reply With Quote
Old 05-12-2011, 10:34 AM   #33
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default

NP hijacking its a similar event to what I am still experiencing. My car is now doing this at stop lights with the car in gear and clutch depressed. I watch my oil pressure dip below 20psig along with rpm fluttering below idle and then catching itself. IDK what the problem is we need to figure this out.

Maybe the suby gods are telling me to trade the car in for a new STI
dan1587wrx is offline   Reply With Quote
Old 05-12-2011, 01:22 PM   #34
Bakerbrdz
Scooby Newbie
 
Member#: 132394
Join Date: Nov 2006
Location: NORFOLK, VIRGINIA
Vehicle:
1.21 gigawatts?
Lighting bolt power bitch

Default

not a tuner nor an expert, could it be that u are losing oil pressure? crack oil pick up?? its a guess!

-baker-
Bakerbrdz is offline   Reply With Quote
Old 05-13-2011, 12:28 PM   #35
Operanal
Scooby Newbie
 
Member#: 127249
Join Date: Sep 2006
Location: NJ
Vehicle:
2006 WRX Limited
Black

Default

The dealer service tech found (and showed me) at least one corroded contact on the ECU harness under the hood near the battery. He told me there was also some water in that harness when he pried it apart. I guess it makes sense that heat would make the problem manifest itself more...

Come to think of it, I did jump-start my step dad's car in the rain a month or two ago. I'm still surprised that these under-hood wiring harnesses aren't designed to withstand some water contact. If I ever get the car back I'm going to cover all the harnesses with electrical grease

Dan, have you checked your harnesses...?
Operanal is offline   Reply With Quote
Old 05-13-2011, 12:31 PM   #36
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

Thats a real good point. If you have issues like this you really should remove the battery, Open those connectors and then clean the contacts. On STIs Its common that the motor tweaks over and pulls on the harness. This pulls the pins loose. Most of the time, We leave them off the brackets so there is more slack.

C
Clark Turner is offline   Reply With Quote
Old 06-03-2011, 07:42 AM   #37
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default

Update: I checked the ECU which is in the passenger foot well and all connections were clean and fully together. I also checked the wiring going to the fuse box and everything was clean and fully connected.

Any other thoughts.
dan1587wrx is offline   Reply With Quote
Old 03-05-2012, 09:08 AM   #38
XCBatman
Scooby Newbie
 
Member#: 258467
Join Date: Sep 2010
Chapter/Region: NESIC
Location: Maine
Vehicle:
2006 STi M@ tuned
2001 Outback beater

Default

I too was driving on the highway, about to take an exit, depressed the clutch, and my '06 STI stalled. Dangerously there was no power steering, but I was able to stop in time. Started up the car, and it happened about 200m down the road. I have turboback exhaust, SPT intake, and opensource tune.

Turns out that when I replaced the air filter I hadn't secured it tight enough. Properly secured it, and it seems to have fixed the problem. So it was air-flow related. I just wanted to add my information and findings for anyone else who stumbles across this thread.
XCBatman is offline   Reply With Quote
Old 09-15-2013, 09:23 PM   #39
easterbran
Scooby Specialist
 
Member#: 307359
Join Date: Jan 2012
Chapter/Region: South East
Location: Tyrone,GA
Vehicle:
'05 STi Stage II
OBP

Default

Quote:
Originally Posted by XCBatman View Post
I too was driving on the highway, about to take an exit, depressed the clutch, and my '06 STI stalled. Dangerously there was no power steering, but I was able to stop in time. Started up the car, and it happened about 200m down the road. I have turboback exhaust, SPT intake, and opensource tune.

Turns out that when I replaced the air filter I hadn't secured it tight enough. Properly secured it, and it seems to have fixed the problem. So it was air-flow related. I just wanted to add my information and findings for anyone else who stumbles across this thread.
Thanks for posting this. I am currently having the same issue with my 05 STi (same mods as you). I was told that it might be a bad MAF sensor, but I'll check the air filter.
easterbran is offline   Reply With Quote
Old 11-29-2013, 12:10 AM   #40
no_shine
Scooby Newbie
 
Member#: 309365
Join Date: Feb 2012
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
03 WRX
SRP

Default

This just started happening to me. Any time I depress the clutch to coast at freeway speeds the car stalls, which is extremely dangerous because it cuts power steering and breaking. Has anyone been able to find a consistent source of this issue? 2007 wrx 97k on the clock. cat back, DP,CAI.
no_shine is offline   Reply With Quote
Old 11-29-2013, 10:04 AM   #41
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by no_shine View Post
This just started happening to me. Any time I depress the clutch to coast at freeway speeds the car stalls, which is extremely dangerous because it cuts power steering and breaking. Has anyone been able to find a consistent source of this issue? 2007 wrx 97k on the clock. cat back, DP,CAI.
There is no consistent source, because it has nothing to do with pushing in the clutch. The problem is simply that the engine isn't catching itself at idle, the cause of which can be a fueling problem, ignition problem, idle logic problem, or throttle problem.

Extremely dangerous??? Yes you lose power steering, but at freeway speeds that doesn't really matter. You don't lose assisted breaks until the manifold vacuum is exhausted, which gives you a good 1-2 presses before it's gone, plenty of time to just let the clutch back out to get the engine running again.

Last edited by the suicidal eggroll; 11-29-2013 at 10:10 AM.
the suicidal eggroll is offline   Reply With Quote
Old 11-29-2013, 11:54 AM   #42
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

Pressure test the intake to make sure you have no leaks. If its tight. Then this can be fixed in the tune. I put an anti stall system in my maps I have developed for years. But even my maps with a car that has intake leaks, will stall.

The real question here is why would you go 70mph and then push in the clutch to coast. Never coast a manual car down like that. You should down shift(rev match) all the way down to 2nd, Then you can push the clutch in and coast or brake to a stop. Half the people I ride with dont know how to Drive a stick.

When you go from high rpm to idle like that or if the engine stalls like in your case, You take the oil flow away from the motor and turbo... ITs hard on the engine. Not to mention if something happens and you need power, Your in neutral and you would be able to accelerate

If you want, Take a log of idle and I send it to me. I would be happy to look at it for you. I am pretty good at spotting leaks.

C
Clark Turner is offline   Reply With Quote
Old 11-29-2013, 10:43 PM   #43
some dude
Scooby Specialist
 
Member#: 100300
Join Date: Nov 2005
Chapter/Region: MWSOC
Location: MIC|-|IG/\N
Vehicle:
06 WRX
CGM

Default

This EXACT thing has always been how my 06 wrx acts. Stopped in neutral, or in gear with clutch pushed in, it revs freely and quickly ( normally ). If I'm rolling and I pop it in neutral, or in gear with clutch pushed in, it does not rev freely and is delayed significantly. Im original
Owner and it's done it since new.


Quote:
Originally Posted by NemesisSi View Post
This may or may not be related......I have noticed since going stage 2 AP platform that when I am rolling/cruising at speed and put the clutch in and then blip the throttle I have no to very small rpm change. I actually have to hit the gas pedal pretty good to get a rev. When I am parked and do the same thing I have almost instant rev response at the level of input force. There still is a tiny bit of delay but that is just because of the TBW system. Reminds me of a car that is flooded and hard to start.
some dude is offline   Reply With Quote
Old 11-30-2013, 12:33 PM   #44
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

Yes. The 06/07 WRX have a very odd and different ECU with a different processor for the DBW. They only used this ECU for those two years. The other quirk they have is if you turn the steering wheel back and forth rapidly at a stop, the RPMS will go up and down. Some setups/tunes really exacerbate this and when you turn the wheel to back up, the engine rpm will shoot up a bit and can stall the motor. I have spent years perfecting and tuning this platform and my maps have anti stall built in. So if you have a Cobb Ap2. or Ap3. My map will fix the stalling.

Make 100% sure there are no intake leaks. Even factory stock cars have leaks and if it does, the problem will be much much worse.

C
Clark Turner is offline   Reply With Quote
Old 11-30-2013, 03:50 PM   #45
Dillinja666
Scooby Newbie
 
Member#: 332644
Join Date: Sep 2012
Chapter/Region: SCIC
Location: A whales Vagina
Vehicle:
07 STI
It's white

Default

My 07 would randomly stall when pushing in the clutch at low rpm sometimes when the A/C was on, it was like the idle was too low and it would not catch itself when the A/C clutch engaged right as I pushed in the clutch. I bumped the idle up 50 rpm with A/C on and A/C off in the AP and the problem never came back. Have you tried that?
Dillinja666 is offline   Reply With Quote
Old 11-30-2013, 03:54 PM   #46
Andrewxxcarlson
Scooby Specialist
 
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:
2006 WRX
WRB

Default

This has happened to me twice on my 06 wrx, the anti blip system doesn't catch the falling rpms and just dies. Starts back up perfect. Too random.
Andrewxxcarlson is offline   Reply With Quote
Old 12-01-2013, 10:30 PM   #47
ShawDizzle
Scooby Specialist
 
Member#: 118902
Join Date: Jun 2006
Chapter/Region: Tri-State
Location: Jersey City, NJ
Vehicle:
08 WRX Premium Sdn
White

Default

Happens on my 08 very rarely but don't stall at all really. I heard that raising your idle rpm a hair also resolves the issue.
ShawDizzle is offline   Reply With Quote
Old 12-02-2013, 03:25 AM   #48
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

Quote:
Originally Posted by Clark Turner View Post
Yes. The 06/07 WRX have a very odd and different ECU with a different processor for the DBW. They only used this ECU for those two years. The other quirk they have is if you turn the steering wheel back and forth rapidly at a stop, the RPMS will go up and down. Some setups/tunes really exacerbate this and when you turn the wheel to back up, the engine rpm will shoot up a bit and can stall the motor. I have spent years perfecting and tuning this platform and my maps have anti stall built in. So if you have a Cobb Ap2. or Ap3. My map will fix the stalling.

Make 100% sure there are no intake leaks. Even factory stock cars have leaks and if it does, the problem will be much much worse.

C
yeah....i have found that these cars...especially the early dbw cars are very twitchy with intake/vac leaks and/or leaking bpv/bov's

and i hated my 06 wrx throttle response when i got the car....tuning it made it MUCH m0 betta
Uncle Scotty is offline   Reply With Quote
Old 12-04-2013, 11:59 AM   #49
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default

I figured out my issue awhile ago and wrote up a nice post on how I troubleshoot the issue here:

http://forums.nasioc.com/forums/show....php?t=2456918

After replacing the harness I have not had a problem since.

Dan
dan1587wrx 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
06 WRX Squeal On Cold Starts When Clutch Is Engaged dan1587wrx Transmission (AT/MT) & Driveline 35 06-19-2009 02:36 PM
Weird jingling noise when clutch is depressed... DoodieHead Transmission (AT/MT) & Driveline 9 01-14-2008 02:23 PM
Bad noise when clutch is depressed, dealer says tranny going out... AnthonyA182 Transmission (AT/MT) & Driveline 5 06-04-2007 01:45 PM
Car tries to stall when clutch is depressed. PolarisSnT Factory 2.0L Turbo Powertrain 15 12-05-2006 11:59 PM
Metallic Clicking sound when clutch pedal depressed Craig W Transmission (AT/MT) & Driveline 4 07-31-2005 10:14 PM


All times are GMT -4. The time now is 04:08 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.