Welcome to the North American Subaru Impreza Owners Club Friday December 19, 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 (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 09-29-2012, 05:10 PM   #1
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default 2006 STI starts then dies. Can anyone tell me what's wrong with it? (w/ video)

FIXED: Bad fuel pump. Fuel pressure test on the feed line confirmed that the fuel pump wouldn't hold pressure. Used pump assy from ebay fixed the problem.



2006 STI
Invidia N1 Race Catback
Cobb AP Stock-like OTS map (though problem exists whether I'm stock, stock-like, or Stage 1)

The car turns over just fine. Sometimes it starts right up. Sometimes it turns over a few times and then starts. Sometimes it doesn't start at all. Usually it starts eventually. Problem used to only occur when the car was hot, now it occurs even when cold.

I replaced the fuel pump relay but it didn't help. I think my next step is going to be a fuel pressure test.

Anyone have any idea whats wrong with it? What I should test next?

Thanks in advance!
* Registered users of the site do not see these ads.

Last edited by LaffyTaffy; 12-13-2012 at 02:10 PM. Reason: FIXED!
LaffyTaffy is offline   Reply With Quote
Old 09-29-2012, 05:25 PM   #2
TheFugitiveMind
Scooby Specialist
 
Member#: 98012
Join Date: Oct 2005
Chapter/Region: SCIC
Location: THE NARD, CA
Vehicle:
2006 Aspen White STi
Captain makes it Happen!

Default

its possible that the chip in the key for the immobilizer is failing. or the immobilizer unit itself is failing.
TheFugitiveMind is offline   Reply With Quote
Old 09-29-2012, 05:29 PM   #3
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default

How would I test for that?
LaffyTaffy is offline   Reply With Quote
Old 09-29-2012, 05:33 PM   #4
funk32
NASIOC Supporter
 
Member#: 245787
Join Date: May 2010
Chapter/Region: W. Canada
Location: Canada
Vehicle:
2004 STi
PSM

Default

check you tmic or fmic couplers, I know when i had a coupler go lose it would start then die and sometimes take a few tries before it would start. can you rev it and it stays running? or does it die no matter what?
funk32 is offline   Reply With Quote
Old 09-29-2012, 05:35 PM   #5
holyjoetart
Scooby Newbie
 
Member#: 232986
Join Date: Dec 2009
Location: Rock Springs, WY
Vehicle:
07 Legacy GT
OBP

Default

Might want to start with a simple approach.

Any CELs?
Fuel pressure
Vacuum leak check
holyjoetart is offline   Reply With Quote
Old 09-29-2012, 05:50 PM   #6
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default

No CELs. If you give it gas it still dies. Will check the couplers, then vacuum, then fuel pressure.
LaffyTaffy is offline   Reply With Quote
Old 09-29-2012, 05:51 PM   #7
UK-Wagon
Scooby Specialist
 
Member#: 232430
Join Date: Dec 2009
Chapter/Region: SCIC
Location: On the Left side
Vehicle:
555 XTi
1 AW & 1 CGM

Default

Quote:
Originally Posted by LaffyTaffy View Post
How would I test for that?
Only the dealer can try to diagnose that issue

Quote:
Originally Posted by funk32 View Post
check you tmic or fmic couplers, I know when i had a coupler go lose it would start then die and sometimes take a few tries before it would start. can you rev it and it stays running? or does it die no matter what?
No, its ignition related for sure! If it was one of those it would be noticable at other times. The engine shuts off jsut as if someone turned it off.

Quote:
Originally Posted by holyjoetart View Post
Might want to start with a simple approach.

Any CELs?
Fuel pressure
Vacuum leak check
Maybe, but I believe otherwise.

OP, its not the battery. So dont let people tell you that. To me it sounds ignition related or immobilizer system related. I would get it to the dealer and get their opinion. If they think its immobilizer related just as i suspect..... then i would start with a new ignition key, and reprogram. If thats not it, then some further testing of the immobilizer system or ignition system is needed.

Sometimes just dropping youre keys on the ground a couple times can damage the key and the chip that is imbedded into it. Or the more common... slamming the door with keys in youre hand and bashing the ignition key between the door in the process. It happens fairly often believe it or not
UK-Wagon is offline   Reply With Quote
Old 09-29-2012, 06:02 PM   #8
UK-Wagon
Scooby Specialist
 
Member#: 232430
Join Date: Dec 2009
Chapter/Region: SCIC
Location: On the Left side
Vehicle:
555 XTi
1 AW & 1 CGM

Default

Also....
Does the security light flash?
Do you have an aftermarket alarm installed?
UK-Wagon is offline   Reply With Quote
Old 09-29-2012, 06:08 PM   #9
funk32
NASIOC Supporter
 
Member#: 245787
Join Date: May 2010
Chapter/Region: W. Canada
Location: Canada
Vehicle:
2004 STi
PSM

Default

well that's how my car shut off after i blew a coupler, it would start then die because it wouldn't have enough oxygen and too much fuel since the are was already measured threw the maf... but your a subaru tech so id go with your advice
funk32 is offline   Reply With Quote
Old 09-29-2012, 06:42 PM   #10
FIREROCK27
Scooby Newbie
 
Member#: 279726
Join Date: Apr 2011
Default

Uk-wagon Just helped me with a similar problem with my car today... It turns out that one of my keys was bad. The car would turn on and turn off soon after like yours. They key worked fine until last week and for some reason will work 50% of the time. Might try using your second set of keys and see if you still have the same problem.
FIREROCK27 is offline   Reply With Quote
Old 09-29-2012, 10:57 PM   #11
06rexwagon
Scooby Specialist
 
Member#: 114730
Join Date: May 2006
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2006 WRX Limited Wag
9.8@150

Default

What intake? If it is a short ram make sure the maf is facing the right way. Seems simple but I've seen it more than a few times.
06rexwagon is offline   Reply With Quote
Old 09-30-2012, 02:28 AM   #12
UK-Wagon
Scooby Specialist
 
Member#: 232430
Join Date: Dec 2009
Chapter/Region: SCIC
Location: On the Left side
Vehicle:
555 XTi
1 AW & 1 CGM

Default

Quote:
Originally Posted by 06rexwagon View Post
What intake? If it is a short ram make sure the maf is facing the right way. Seems simple but I've seen it more than a few times.
General common sense after reading this bit of info the Op stated;

"Sometimes it starts right up. Sometimes it turns over a few times and then starts. Sometimes it doesn't start at all. Usually it starts eventually. Problem used to only occur when the car was hot, now it occurs even when cold."

His MAF is in correctly. If its not throwing codes for the MAF or P171/P0172.... its NOT the MAF failing either. Next suggestion?
UK-Wagon is offline   Reply With Quote
Old 09-30-2012, 10:50 AM   #13
06rexwagon
Scooby Specialist
 
Member#: 114730
Join Date: May 2006
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2006 WRX Limited Wag
9.8@150

Default

Quote:
Originally Posted by UK-Wagon

General common sense after reading this bit of info the Op stated;

"Sometimes it starts right up. Sometimes it turns over a few times and then starts. Sometimes it doesn't start at all. Usually it starts eventually. Problem used to only occur when the car was hot, now it occurs even when cold."

His MAF is in correctly. If its not throwing codes for the MAF or P171/P0172.... its NOT the MAF failing either. Next suggestion?
It won't give a code if the short ram is backwards. But thanks for being hard headed when people offer help.
06rexwagon is offline   Reply With Quote
Old 10-01-2012, 09:11 PM   #14
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default

I briefly investigated a few of the vacuum hoses and intercooler lines in the engine bay and nothing seemed loose. Stock intake. I tried all three keys and the same result with all. Played with idle settings and timing on Cobb AP. Switched to Stage 1 map. Still no luck. Not sure how I'm going to do a proper vacuum test when the car only runs for 3 seconds at a time, so fuel pressure test may be next. I ordered an OBDII to USB cable and plan on using RomRaider to log parameters at startup. I also read about someone who had a similar problem and the AVCS solenoid was the culprit?
LaffyTaffy is offline   Reply With Quote
Old 10-01-2012, 10:30 PM   #15
Franko
Scooby Newbie
 
Member#: 193628
Join Date: Nov 2008
Chapter/Region: E. Canada
Location: Canada
Vehicle:
2010 STI
SSM

Default

What happens if you try and keep it running by giving gas? Will it stay running?

If the security light isn't flashing, its not the transponder.

Seems like a fueling issue. When was the last time you changed the fuel filter?

Do the test again like you did in this video, but this time dont give the fuel pump a chance to prime. At 0:20 in you turned the key on and left it for a few seconds, this gave the pump a chance to prime and it started again.

Start the car and let it die then immediately start it again without delay. If it doesn't start the second time then it is a fueling issue (pump, clogged filter or lines).

When you turn the key on without starting can you hear the pump priming? How does it sound? It should be fairly quiet.

Testing your fuel pressure is a good easy next step.

I suggest upgrading the pump anyway. Its only $80 and really makes a difference.
Franko is offline   Reply With Quote
Old 10-05-2012, 03:14 PM   #16
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default

Ok. I havent done any of that other stuff yet, but I got a VAG-COM KKL cable and RomRaider and recorded some parameters during startup (I'll post the logs shortly). I wasn't sure which parameters to record though so I just grabbed ones that sounded important. Anyone have suggestions as to what parameters to record? Or should I just record all of them?
LaffyTaffy is offline   Reply With Quote
Old 10-05-2012, 03:21 PM   #17
clipsy
Scooby Newbie
 
Member#: 227451
Join Date: Oct 2009
Location: Rockland NY
Vehicle:
2006 wrx
white

Default

MY car was doing this same thing. It would start up then idle like **** and stallout. I unplugged the maf sensor to see how it ran with it disconnected, ran fine. Purchased a new maf sensor an the problem stopped.
clipsy is offline   Reply With Quote
Old 10-05-2012, 04:45 PM   #18
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default


Last edited by LaffyTaffy; 10-05-2012 at 06:34 PM.
LaffyTaffy is offline   Reply With Quote
Old 10-05-2012, 05:22 PM   #19
scott06sti
Scooby Newbie
 
Member#: 320340
Join Date: May 2012
Chapter/Region: TXIC
Location: East Bernard, Tx.
Vehicle:
2006 Subaru STI
Silver

Default

It sounds like your chip in the key has gotten messed up, I have an 06 STI same thing got the other key an ran perfect.
scott06sti is offline   Reply With Quote
Old 10-05-2012, 06:33 PM   #20
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default

Here's a better link to the log:
https://docs.google.com/spreadsheet/...FpxQld3LXhtLWc

I have tried all three keys (two black and one grey), with all of the keys very close to the ignition, so if one of them is gone, they're all gone. My local stealership is f***tarded so if I do end up going the new key route, it will probably be a new key, ECM, and ignition cylinder from ebay.

I also tried unplugging the MAF, but it still died.
LaffyTaffy is offline   Reply With Quote
Old 10-05-2012, 08:59 PM   #21
funk32
NASIOC Supporter
 
Member#: 245787
Join Date: May 2010
Chapter/Region: W. Canada
Location: Canada
Vehicle:
2004 STi
PSM

Default

something like this happened to a local member, and it turned out to be a o-ring.

"So i took the car Apex Specialized to find the problem. $600 dollar later the problem was a cracked rubber O-ring. the O-ring was around the Fuel filter. This cracked O-Ring basically killed the fuel pressure. When I checked the Fuel Pressure i thought it was enough but apparently i was wrong. the entire upper part had to be replaced and now she is running fine. It hurts cause this is something i could have replaced myself but i did not know what was wrong. here is a picture of what went wrong...."

funk32 is offline   Reply With Quote
Old 10-07-2012, 10:16 PM   #22
LaffyTaffy
Scooby Newbie
 
Member#: 235719
Join Date: Jan 2010
Chapter/Region: South East
Location: Pooler, GA
Vehicle:
2006 STI
WRB

Default

Another log, with only RPM and rear O2 sensor:
https://docs.google.com/spreadsheet/...2tNM0ZZSm4waHc

I don't know much about what an O2 sensor reading ought to look like, but I feel like once the car is running, the O2 sensor should register an appreciable change and it does not.

I still need to investigate fuel pressure and I'll look into that o-ring.
LaffyTaffy is offline   Reply With Quote
Old 11-12-2012, 11:02 PM   #23
flyboynextdoor
Scooby Newbie
 
Member#: 308314
Join Date: Jan 2012
Location: High Level, Alberta
Vehicle:
1999 Impreza RS
Metallic White

Default

My 99 2.5RS is doing the exact same thing. Stalled on the highway, starts like no problem then dies seconds after like its starving for fuel. I've replaced the Pump with a Walbro, replaced the fuel pressure regulator, and the fuel filter. Still no luck. Cleaned my MAF and tried unplugging my Cam sensor. Nothing has helped. My car has been in the garage a month now. It shows no codes, I'm lost on this.
flyboynextdoor is offline   Reply With Quote
Old 11-12-2012, 11:30 PM   #24
flyboynextdoor
Scooby Newbie
 
Member#: 308314
Join Date: Jan 2012
Location: High Level, Alberta
Vehicle:
1999 Impreza RS
Metallic White

Default

Theres at least three of us guys having the same problem on rs25.com right now...

http://www.rs25.com/forums/f13-troubleshooting

You'd think with this many people having problems we could hatch a solution.
flyboynextdoor is offline   Reply With Quote
Old 11-13-2012, 05:11 PM   #25
wrx_impreza02
Scooby Newbie
 
Member#: 254711
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: eldon, mo
Vehicle:
07 STI
OBP

Default

My 07 sti did this and it was the immobilizer module.
wrx_impreza02 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


All times are GMT -4. The time now is 09:14 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.