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Old 09-29-2012, 04:10 PM   #1
LaffyTaffy
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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!
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Last edited by LaffyTaffy; 12-13-2012 at 01:10 PM. Reason: FIXED!
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Old 09-29-2012, 04:25 PM   #2
TheFugitiveMind
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2015 XV Limited - Orange!

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its possible that the chip in the key for the immobilizer is failing. or the immobilizer unit itself is failing.
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Old 09-29-2012, 04:29 PM   #3
LaffyTaffy
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How would I test for that?
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Old 09-29-2012, 04:33 PM   #4
funk32
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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?
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Old 09-29-2012, 04:35 PM   #5
holyjoetart
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Might want to start with a simple approach.

Any CELs?
Fuel pressure
Vacuum leak check
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Old 09-29-2012, 04:50 PM   #6
LaffyTaffy
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No CELs. If you give it gas it still dies. Will check the couplers, then vacuum, then fuel pressure.
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Old 09-29-2012, 04:51 PM   #7
UK-Wagon
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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
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Old 09-29-2012, 05:02 PM   #8
UK-Wagon
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Also....
Does the security light flash?
Do you have an aftermarket alarm installed?
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Old 09-29-2012, 05:08 PM   #9
funk32
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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
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Old 09-29-2012, 05:42 PM   #10
FIREROCK27
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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.
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Old 09-29-2012, 09:57 PM   #11
06rexwagon
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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.
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Old 09-30-2012, 01:28 AM   #12
UK-Wagon
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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?
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Old 09-30-2012, 09:50 AM   #13
06rexwagon
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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.
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Old 10-01-2012, 08:11 PM   #14
LaffyTaffy
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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?
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Old 10-01-2012, 09:30 PM   #15
Franko
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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.
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Old 10-05-2012, 02:14 PM   #16
LaffyTaffy
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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?
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Old 10-05-2012, 02:21 PM   #17
clipsy
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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.
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Old 10-05-2012, 03:45 PM   #18
LaffyTaffy
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Last edited by LaffyTaffy; 10-05-2012 at 05:34 PM.
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Old 10-05-2012, 04:22 PM   #19
scott06sti
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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.
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Old 10-05-2012, 05:33 PM   #20
LaffyTaffy
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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.
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Old 10-05-2012, 07:59 PM   #21
funk32
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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...."

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Old 10-07-2012, 09:16 PM   #22
LaffyTaffy
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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.
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Old 11-12-2012, 10:02 PM   #23
flyboynextdoor
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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.
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Old 11-12-2012, 10:30 PM   #24
flyboynextdoor
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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.
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Old 11-13-2012, 04:11 PM   #25
wrx_impreza02
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My 07 sti did this and it was the immobilizer module.
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