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Old 10-05-2006, 08:36 PM   #1
Computergeek24
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Default Strange boost problem with a strange dealer diagnosis. Help?

Hello techs and subie gurus of nasioc, maybe one of you can shed a little light on this problem....

First off, the car:
2002 WRX sedan bought used
65k miles
Still under extended waranty
Intake (was told it is TurboXS (not shorty) but can't find any record of it) Have never gotten a CEL from anything
Idles at 500rpm.
Had TB exhaust from previous owner changed back to stock at 58k when I bought it 8 months ago.
Always gets Chevron 91 octane (no 93 nearby that I can find )
So other than the intake, it's comptetly stock as far as I can tell.

The problem:
About 3 weeks ago I started noticing sort of a flapping/fluttering noise comming from where the turbo is. I would only get the noise while on the throttle (partial) and ONLY while the engine was under load (so I couldn't play hide and go seek for the noise under the hood in the garage). I could only hear it at lower RPMs (1500s to about 4000) and up until about .02Mpa on the stock boost guage, noise might have been there after that but would have been drowned out by the engine and turbo spool. After some searching around the forums I settled on the answer that it was the wastegate doin' its thing and I just never noticed it before.

Well about a week ago while driving, the car just decided to stop boosting all the way. Rather than hitting its usual peak of .09-.1Mpa and settling around .08, it would boost at normal speeds up to .05 and stay firmly there as if the ECU was instructing it to do so. After searchinng for "low boost" and skimming through numerous threads I tried reseting the ECU (to see if it might have been the ecu putting hte car into limp mode due to knock). After the reset, the car ran as usual for aobut another 200 miles until yesterday it did it again, same boost limiting symptoms. Drove it around like this for a day and started noticing that the strange noise was not there. So today I took it into the dealer (south coast subaru) and had them take a look at it after telling them the symptoms. After an hour and a test drive the tech comes in at tells me he thinks it could either be the ecu (doubt it) or that the cat in the up-pipe has come loose and has been moving about in the pipe. Replacing either of them would be free under the waranty so they ordered another up-pipe with a new cat to be installed on tuesday. As I left the dealer the .05 limit was still there but then a few stoplights down the road it opens up all the way to the usual .09 and back with the boost is the damn fluttering noise.

Could the noise have been the cat moving around in the up-pipe and when it stopped (lodged itself somewhere?) it restricted output causing low boost? Or is it more likely something with the wastegate (or one of its operating parts).

I'm prety confused here and would greatly appreciate and suggestions or help.

-Kevin
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Old 10-05-2006, 08:49 PM   #2
kx02wr
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Take the intake off!! your car is not tuned for it. take it off now, reset ecu and see if that helps. your extended waranty will not be honored with that intake.
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Old 10-05-2006, 08:55 PM   #3
Computergeek24
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I've been meaning to snag a used stock intake off someone, but have yet to get around to it.

As for the waranty, the service manager there saw it and said that because it was not causing any check engine lights that it would not effect my waranty (made sure to call and ask about that before bringing it in). The MAF section on the intake is the exact diameter of the stock unit (measured a friends stock intake).
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Old 10-05-2006, 09:09 PM   #4
kx02wr
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This is at a suby dealership? They voided my waranty cause they said my car was off roaded . Get the stock airbox and try it. I really don't know much about the txs intake maybe someone will chime in who does. U def shouldn't have put that catted up pipe back in the mix. Good luck.
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Old 10-05-2006, 09:18 PM   #5
Computergeek24
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Put the catted up pipe back in the mix? I actually don't know if it was ever replaced with a catless one, but the guy who sold me the car (friend of a friend) returned all things exhaust back to stock. I just know that at the very least he had a turbo-back.

And yes, it is a suby dealer. And although they seemed to be friendly about the intake they mentioned it might have been a different story if I had an aftermarket downpipe when the problem occured.
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Old 10-05-2006, 09:43 PM   #6
kx02wr
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Thats weird I can't believe they are cool with yer intake. Have them install an 06 wrx, or any sti up pipe. If you plan on doing anything else to yer car you don't want a cat before your turbo. An intake is suppose to lean out your a/f ratio on a wrx which could have caused the cat to break up and go into your turbo already. Have seen pics of this it's ugly. Your warantied though so i wouldn't worry bout it.
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Old 10-05-2006, 10:07 PM   #7
Computergeek24
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Heh, already asked about a cat-free pipe. Unfourtenetly all they will put in under waranty is a stock replacment.
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Old 10-08-2006, 03:25 PM   #8
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Confused bump.
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Old 10-09-2006, 01:14 AM   #9
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Bump before dealer re-visit tuesday.
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Old 10-09-2006, 01:30 AM   #10
rkramer
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Quote:
Originally Posted by kx02wr View Post
Take the intake off!! your car is not tuned for it. take it off now, reset ecu and see if that helps. your extended waranty will not be honored with that intake.

depends... if it is an aftermarket extended warranty, the intake won't have any effect. in this case it is in subaru's best interest NOT to deny claims, as the dealer makes a ton of money on warranty claims to aftermarket companies.
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Old 10-09-2006, 11:17 AM   #11
Computergeek24
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As far as I know it is the extended waranty (100k/6yrs) bought with the car by the original owner.

And the confusion I have isn't that they are ignoring the intake, it's what the cause the the noise/boost problem is.....
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Old 10-09-2006, 12:28 PM   #12
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I have delt with south coast subaru many times they are good people there. I have a turboxs tbe with cat and they dont mind it at all infact there parts department sells catless downpipes and the works if you go to southcoastperformance.com that is the dealers parts department they are way cool. Just thought i would share that also good luck with your problem im sure they will take care of you.
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Old 10-09-2006, 12:34 PM   #13
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1- your solenoid is having issues

or

2-your pinging causing the ecu to go to wastegate pressure
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