Welcome to the North American Subaru Impreza Owners Club Friday July 29, 2016
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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. 
Reply
 
Thread Tools Display Modes
Old 04-24-2011, 07:26 PM   #1
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default 06 WRX Stalls Out When Clutch is Depressed

I have an 06 WRX with a VF39, EWG, AP and protune and supporting mods. Recently I have noticed that when I am on a highway doing 70 - 80mph and need to slow down to pass through a toll both the car stalls out when I push the clutch in or put the car in neutral. I usually push the clutch in and put the car in neutral for maybe a 1/4 mile before the toll both. When the car is in neutral I can watch the rpms drop down to idle speed (approximately 600rpm) and then they start bouncing around and going below 600rpm and maybe up to 1000rpm. While this is occurring I have been watching oil pressure and it usually bounces around from a minimum of 20psig to 40psig. Eventually if I do not blip the throttle the car stalls out.

Sorry for the long story. If any one has some insight I would greatly appreciate it.

Dan
* Registered users of the site do not see these ads.
dan1587wrx is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-24-2011, 07:38 PM   #2
abrumlev
Scooby Specialist
 
Member#: 197920
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Indiana
Vehicle:
2005 Legacy GT
ABP

Default

Check your vacuum connections...that's the most common cause of crappy idle.
abrumlev is offline   Reply With Quote
Old 04-24-2011, 07:57 PM   #3
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default

The thing is the car does not idle rough when just sitting there. This only happens as the car is moving.
dan1587wrx is offline   Reply With Quote
Old 04-24-2011, 10:30 PM   #4
NemesisSi
Scooby Specialist
 
Member#: 79805
Join Date: Jan 2005
Chapter/Region: TXIC
Location: DFW
Vehicle:
2011 Acura TSX 2.4
Blue

Default

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.
NemesisSi is offline   Reply With Quote
Old 04-25-2011, 03:07 AM   #5
GDBF
Scooby Specialist
 
Member#: 108473
Join Date: Feb 2006
Chapter/Region: NWIC
Location: Lakeland Auburn, WA
Vehicle:
2006 WRX Blouch
340whp/363wtq

Default

Do you have an after market intake? Your maf is reading too much air when theres no load.
GDBF is offline   Reply With Quote
Old 04-25-2011, 12:36 PM   #6
elevenpoint7five
Scooby Specialist
 
Member#: 187798
Join Date: Aug 2008
Chapter/Region: MWSOC
Location: Elk Grove Village IL
Vehicle:
04 2 liters of
AWESOME!

Default

Quote:
Originally Posted by GDBF View Post
Do you have an after market intake? Your maf is reading too much air when theres no load.
Yep. 3 solutions, get the tune fixed, get rid of the intake, or stay in gear when you're coming to a stop(obviously clutch in at some point, but not at 80mph).
elevenpoint7five is offline   Reply With Quote
Old 04-25-2011, 01:18 PM   #7
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

if you decel in gear, clutch pedal out....your injectors are OFF as in not injecting fuel and you will save gas

and see above for the 'fix' many times this is a vac leak issue
Uncle Scotty is offline   Reply With Quote
Old 04-25-2011, 06:55 PM   #8
NemesisSi
Scooby Specialist
 
Member#: 79805
Join Date: Jan 2005
Chapter/Region: TXIC
Location: DFW
Vehicle:
2011 Acura TSX 2.4
Blue

Default

Quote:
Originally Posted by Uncle Scotty
if you decel in gear, clutch pedal out....your injectors are OFF as in not injecting fuel and you will save gas

and see above for the 'fix' many times this is a vac leak issue
I could see reduced in cycle but not off. If they were off then my motor would shut off totally due to fuel starvation.
NemesisSi is offline   Reply With Quote
Old 04-25-2011, 09:31 PM   #9
elevenpoint7five
Scooby Specialist
 
Member#: 187798
Join Date: Aug 2008
Chapter/Region: MWSOC
Location: Elk Grove Village IL
Vehicle:
04 2 liters of
AWESOME!

Default

Quote:
Originally Posted by NemesisSi View Post
I could see reduced in cycle but not off. If they were off then my motor would shut off totally due to fuel starvation.
:shakes head: No, they are definitely off. 95% of modern cars are set up that way.
elevenpoint7five is offline   Reply With Quote
Old 04-25-2011, 09:59 PM   #10
NemesisSi
Scooby Specialist
 
Member#: 79805
Join Date: Jan 2005
Chapter/Region: TXIC
Location: DFW
Vehicle:
2011 Acura TSX 2.4
Blue

Default

Quote:
Originally Posted by elevenpoint7five
:shakes head: No, they are definitely off. 95% of modern cars are set up that way.
My bad... I misread the initial quote from Uncle Scotty. I just realized he said clutch pedal out meaning you are coasting while in gear. The injectors are cutoff and the gears are forcing the motor to push air out. Spark is turned off to I think preventing lean explosions.

What I have noticed on my car is when my clutch pedal is put in and I rev at speed it seems my car will not rev unless I give it a good blip vs just sitting at a light and give it a light tap. My thoughts are possibly issue is because of my light flywheel, my tune or the inj cycle is reduced to save gas. From my understanding the inj do have to be on if the clutch is detached from the tranny, I.e. pedal pushed in.

If its a vacuum leak would I have other noticible issues. This has been going on since day one of the new tune.

And another thought....it maybe my dumb*** just not giving it enough gas because I rev match (heal and toe) without issues.
NemesisSi is offline   Reply With Quote
Old 04-26-2011, 12:17 AM   #11
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

Quote:
Originally Posted by NemesisSi View Post
My bad... I misread the initial quote from Uncle Scotty. I just realized he said clutch pedal out meaning you are coasting while in gear. The injectors are cutoff and the gears are forcing the motor to push air out. Spark is turned off to I think preventing lean explosions.

What I have noticed on my car is when my clutch pedal is put in and I rev at speed it seems my car will not rev unless I give it a good blip vs just sitting at a light and give it a light tap. My thoughts are possibly issue is because of my light flywheel, my tune or the inj cycle is reduced to save gas. From my understanding the inj do have to be on if the clutch is detached from the tranny, I.e. pedal pushed in.

If its a vacuum leak would I have other noticible issues. This has been going on since day one of the new tune.

And another thought....it maybe my dumb*** just not giving it enough gas because I rev match (heal and toe) without issues.
no...yer STILL wrong

if you are in gear.....no throttle pedal....slowing down.....the injectors are OFF as in no gas....no pedal at all of any kind....feet in the back seat...no injectors firing

and if this only started with the new tune, the tune is bad

trust me on this
Uncle Scotty is offline   Reply With Quote
Old 04-26-2011, 12:25 AM   #12
NitroTrike
Scooby Specialist
 
Member#: 62408
Join Date: May 2004
Chapter/Region: South East
Location: GWR, Florida
Vehicle:
2002 wrx w/ STi guts
174k miles on Mobil 1

Default

Quote:
Originally Posted by Uncle Scotty View Post
no...yer STILL wrong

if you are in gear.....no throttle pedal....slowing down.....the injectors are OFF as in no gas....no pedal at all of any kind....feet in the back seat...no injectors firing

and if this only started with the new tune, the tune is bad

trust me on this
Explain deceleration backfire if there's no fuel (which happens on completely stock cars).
NitroTrike is offline   Reply With Quote
Old 04-26-2011, 01:14 AM   #13
elevenpoint7five
Scooby Specialist
 
Member#: 187798
Join Date: Aug 2008
Chapter/Region: MWSOC
Location: Elk Grove Village IL
Vehicle:
04 2 liters of
AWESOME!

Default

Quote:
Originally Posted by NitroTrike View Post
Explain deceleration backfire if there's no fuel (which happens on completely stock cars).
If every last bit of fuel was burnt there would be no "need" for catalytic converters. There's still fuel vapors in the exhaust system. Also, just because you snap the throttle shut, doesn't mean the injectors can stop quite as quickly.

Scotty is right, if it started with the tune, then it's the tune.
elevenpoint7five is offline   Reply With Quote
Old 04-26-2011, 01:17 AM   #14
elevenpoint7five
Scooby Specialist
 
Member#: 187798
Join Date: Aug 2008
Chapter/Region: MWSOC
Location: Elk Grove Village IL
Vehicle:
04 2 liters of
AWESOME!

Default

Quote:
Originally Posted by NemesisSi View Post
My bad... I misread the initial quote from Uncle Scotty. I just realized he said clutch pedal out meaning you are coasting while in gear. The injectors are cutoff and the gears are forcing the motor to push air out. Spark is turned off to I think preventing lean explosions.

What I have noticed on my car is when my clutch pedal is put in and I rev at speed it seems my car will not rev unless I give it a good blip vs just sitting at a light and give it a light tap. My thoughts are possibly issue is because of my light flywheel, my tune or the inj cycle is reduced to save gas. From my understanding the inj do have to be on if the clutch is detached from the tranny, I.e. pedal pushed in.

If its a vacuum leak would I have other noticible issues. This has been going on since day one of the new tune.

And another thought....it maybe my dumb*** just not giving it enough gas because I rev match (heal and toe) without issues.
Just to elaborate a bit, the injectors come back on at ~1100rpm. This varies per ecu and car, but they're all in the same general area. So even coasting in neutral, from redline until ~1100rpm, your injectors are still off.

If you have to hit the throttle pretty hard, then ask your tuner to adjust your DBW mapping to proper settings.
elevenpoint7five is offline   Reply With Quote
Old 04-26-2011, 08:42 AM   #15
NemesisSi
Scooby Specialist
 
Member#: 79805
Join Date: Jan 2005
Chapter/Region: TXIC
Location: DFW
Vehicle:
2011 Acura TSX 2.4
Blue

Default

Quote:
Originally Posted by Uncle Scotty

no...yer STILL wrong

if you are in gear.....no throttle pedal....slowing down.....the injectors are OFF as in no gas....no pedal at all of any kind....feet in the back seat...no injectors firing

and if this only started with the new tune, the tune is bad

trust me on this
Ummm.....I think that was what I just said in my second post. You might want to read it again. I'm saying that the inj are on when you are out of gear, no attachment to tranny. Motor needs fuel then to keep running....very little.....but still needs fuel. I agree with you on the other part when in gear, pedal out that they are turned off.
NemesisSi is offline   Reply With Quote
Old 04-26-2011, 08:45 AM   #16
NemesisSi
Scooby Specialist
 
Member#: 79805
Join Date: Jan 2005
Chapter/Region: TXIC
Location: DFW
Vehicle:
2011 Acura TSX 2.4
Blue

Default

Quote:
Originally Posted by elevenpoint7five
Just to elaborate a bit, the injectors come back on at ~1100rpm. This varies per ecu and car, but they're all in the same general area. So even coasting in neutral, from redline until ~1100rpm, your injectors are still off.

If you have to hit the throttle pretty hard, then ask your tuner to adjust your DBW mapping to proper settings.
Ya will probably ask Cobb since they are the ones who tuned the car originally. I have always wondered about the sensitivity of the DBW. Friend of mine does a lot with the new Mustangs and he is always fixing the factory calibrations!
NemesisSi is offline   Reply With Quote
Old 04-27-2011, 07:58 PM   #17
Operanal
Scooby Newbie
 
Member#: 127249
Join Date: Sep 2006
Location: NJ
Vehicle:
2006 WRX Limited
Black

Default

I have been having this same exact problem for the past few weeks on my bone-stock '06 WRX. I drive about 40 miles on the highway to and from work. Driving to work in the morning is no problem, but as I approach the end of my highway commute home, if I go into neutral and/or hold in the clutch, the revs bounce around (as does the negative boost levels from -4 to -7 PSI), followed by a stall. To start the thing back up, I have to press in the gas pedal as I turn over the engine. The following morning, the car runs fine again. This happens just about daily.

The car had thrown two CEL codes relating to the throttle position sensor, so I bought a ported-and-polished throttle assembly (with TPS) replacement from Grimmspeed. Prior to that, I tried fuel cleaner, as well as cleaning the throttle plate itself with the appropriate cleaner with no luck. Now, even with the changed throttle assembly I am consistently seeing the behavior described above.

I am stumped, but I think the mods and tuning probably aren't your problem, either.
Operanal is offline   Reply With Quote
Old 04-27-2011, 08:30 PM   #18
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

my 06 wrx dont do that....

I dont have any vac leaks, either
Uncle Scotty is offline   Reply With Quote
Old 04-27-2011, 11:11 PM   #19
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default

The car was tuned about 3 years ago and has not changed. It was tuned with an SPT intake which has not been removed. I dont think the tune is an issue because this has only started happening with in the last 6 months. And i dont believe there are any vac leaks. I have pressure tested the system and could not find anything. Also i am still making and holding boost exactly like it did when the car was tuned.

Could this have something to do with the gas available currently having 10% ethanol. I have heard that the increase in ethanol creates more water vapor in the fuel tank and fuel system but I dont know how to check for this.

Could something be wrong with the EGR valve?

Last edited by dan1587wrx; 04-27-2011 at 11:47 PM.
dan1587wrx is offline   Reply With Quote
Old 04-28-2011, 01:10 AM   #20
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

Quote:
Originally Posted by dan1587wrx View Post
The car was tuned about 3 years ago and has not changed. It was tuned with an SPT intake which has not been removed. I dont think the tune is an issue because this has only started happening with in the last 6 months. And i dont believe there are any vac leaks. I have pressure tested the system and could not find anything. Also i am still making and holding boost exactly like it did when the car was tuned.

Could this have something to do with the gas available currently having 10% ethanol. I have heard that the increase in ethanol creates more water vapor in the fuel tank and fuel system but I dont know how to check for this.

Could something be wrong with the EGR valve?
you dont have an egr vlve...you DO have a pcv valve and that may cause some of this if it is sticking a bit
Uncle Scotty is offline   Reply With Quote
Old 04-28-2011, 07:07 PM   #21
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 will have to check that. But if it was sticking wouldnt the car stall all the time when in neutral.
dan1587wrx is offline   Reply With Quote
Old 04-30-2011, 11:12 AM   #22
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 NitroTrike View Post
Explain deceleration backfire if there's no fuel (which happens on completely stock cars).
Our cars run 10-11:1 AFRs at WOT. The stoichiometric ratio for gas is 14.7. This means that a good 30-40% of the fuel you're spraying into the engine at WOT does not get burned. Most leaves the combustion chamber as vapor, some leaves as liquid. There's no fresh air in the exhaust though, so this fuel can't ignite, it just blows straight through the exhaust. When you let off the gas and the injectors shut off, combustion stops and the engine pumps fresh air into the exhaust system, which allows the little bit of fuel that's left floating around in there to ignite. This is what causes afterfire or afterlighting.

Get a wideband, when you let off the gas the readings change to straight air until you get to ~1200 RPM and the injectors turn back on.
the suicidal eggroll is offline   Reply With Quote
Old 05-05-2011, 05:23 AM   #23
dan1587wrx
Scooby Newbie
 
Member#: 132107
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2006 WRX Stage 3
340WHP 340WTQ WRB

Default

Does this mean that the car will stall out due to the backfire or because the injectors turn off.
dan1587wrx is offline   Reply With Quote
Old 05-05-2011, 06:03 AM   #24
143subaru
Scooby Specialist
 
Member#: 157982
Join Date: Aug 2007
Chapter/Region: MWSOC
Location: Warrenton, MO
Vehicle:
2002 Impreza WRX
World Rally Blue

Default

I have an 02 wrx and what caused my car to do this was it was flooding itself like mad... It got so bad for me that I had to engine brake, or leave it in gear until revs hit about 1k before pushing the clutch in... So next time you push the clutch in watch your air to fuel...
143subaru is offline   Reply With Quote
Old 05-05-2011, 11:49 AM   #25
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
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 (EJ Series Factory 2.0L Turbo) 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 08:28 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.