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Old 09-25-2012, 11:14 AM   #1
SubWrx13
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Default Boost/Drivability issues

Hey guys. I have an 02 wrx I recently purchased. Already have a newer trans in there because I bought it with bad trans. Anyways I also installed a cheap boost guage. The car is lagging on acceleration and even driving a bit rough. Im not sure what the problem is but here are the issues at hand:

Studders to accelerate. Very choppy
Boost guage flutters wild. Then sits at 5psi then flutters again.
Front upstream o2 sensor heat code is going off as soon as car is turned on even after clearing codes.


Any help is GREATLY APPRECIATED. you guys are my only hope. My local mechanics all suck.. Pretty sure im the only one within 50 miles who owns a turbo and a bov. Lol
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Old 09-25-2012, 11:26 AM   #2
SubWrx13
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Just started it and gave it gas in neutral and boost was fluttering up whole way.
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Old 09-25-2012, 11:27 AM   #3
tebriel
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you're going to have to datalog.
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Old 09-25-2012, 11:34 AM   #4
SubWrx13
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Quote:
Originally Posted by tebriel
you're going to have to datalog.
Thats not good.. Dont have the tools for that
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Old 09-25-2012, 11:34 AM   #5
biodude
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Start with replacing your front O2 sensor.
report back

also. Mileage?, any known maintenance performed by the previous owner?
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Old 09-25-2012, 11:49 AM   #6
SubWrx13
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That I can do. Unknown maintainance... Sadly.

Heres upgrades:
Hks bov
Hks 3"turboback exhaust
Aem intake
Bigger intercooler
Aluminum radiator

132k on 02 engine
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Old 09-25-2012, 11:51 AM   #7
Andrewxxcarlson
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First step is replacing your o2 sensor.
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Old 09-25-2012, 12:00 PM   #8
GrimmSpeed
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Definitely replace the o2 sensor but you should also be looking into a tune. A cobb AP would be an easy and effective solution. You could also work with an E-tuner if you don't have anyone in your area.

Mike
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Old 09-25-2012, 01:43 PM   #9
biodude
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Quote:
Originally Posted by SubWrx13 View Post
That I can do. Unknown maintainance... Sadly.

Heres upgrades:
Hks bov
Hks 3"turboback exhaust
Aem intake
Bigger intercooler
Aluminum radiator

132k on 02 engine


given the mileage I'd be curious if the timing belt was ever changed. I would do some basic maiuntenace as well.
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Old 09-25-2012, 02:18 PM   #10
SubWrx13
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Hey so I am gonna tune as soon as I can afford to. Already found a nice awd dyno shop and talked to them about it.

Also will replace timing when I can afford to as well. Thanks.

I am 99% sure that the boost guage was installed on the wrong line by the mechanic. Theres no vacuum it stays at 0 and upon throttle fluctuates like crazy and then chills out and then fluctuates. Pretty sure its just his mistake.
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Old 09-25-2012, 08:26 PM   #11
SubWrx13
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Ok so my SUPER handy mechanic hooked up my boost gauge to the wastegaste line I believe. Thats what I pay him for... Apparently!

I fixed that connection up and found the right line to hook up to. My vacuum no longer reads 0 at idle (what a moron) and its idle vacuum is 15-20 and boost climbs to 15 on open throttle. Doesnt seem to boost very well in first gear is this normal? Wish I knew what a definitely healthy wrx feels like.

Anyways ill be replacing my front 02 sensor and reporting back. Car seems to be running better and better as I drive her around. Some serious power.

Also after replacing coils and spark plugs she is no longer showing signs of afterfire.


However still significant have a significant jerky and choppy accelerstion mostly on low rpms when first get going. Most noticeable in gears 1-3
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Old 09-25-2012, 08:42 PM   #12
Dr. octagon
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Quote:
Originally Posted by SubWrx13 View Post
Ok so my SUPER handy mechanic hooked up my boost gauge to the wastegaste line I believe. Thats what I pay him for... Apparently!

I fixed that connection up and found the right line to hook up to. My vacuum no longer reads 0 at idle (what a moron) and its idle vacuum is 15-20 and boost climbs to 15 on open throttle. Doesnt seem to boost very well in first gear is this normal? Wish I knew what a definitely healthy wrx feels like.

Anyways ill be replacing my front 02 sensor and reporting back. Car seems to be running better and better as I drive her around. Some serious power.

Also after replacing coils and spark plugs she is no longer showing signs of afterfire.


However still significant have a significant jerky and choppy accelerstion mostly on low rpms when first get going. Most noticeable in gears 1-3
That a boy, your figuring it out. Where are you Houghton.......my wife is from there.
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Old 09-25-2012, 08:55 PM   #13
SubWrx13
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Quote:
Originally Posted by Dr. octagon

That a boy, your figuring it out. Where are you Houghton.......my wife is from there.
Thanks im a very quick learner and very open to help. And all help here is greatly appreciated. Im from Iron Mountain which isnt too far. Go up to mt bohemia for skiing and boarding in houghton though. Cant wait to conquer the snow in my subaru!

P.s. Nice screenname you train any MMA? Im a white belt in brazilian jui jitsu under the gracies and train mma as much as possible although my original sport of choice was hockey growing up lol
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Old 09-25-2012, 09:01 PM   #14
Dr. octagon
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Quote:
Originally Posted by SubWrx13 View Post
Thanks im a very quick learner and very open to help. And all help here is greatly appreciated. Im from Iron Mountain which isnt too far. Go up to mt bohemia for skiing and boarding in houghton though. Cant wait to conquer the snow in my subaru!

P.s. Nice screenname you train any MMA? Im a white belt in brazilian jui jitsu under the gracies and train mma as much as possible although my original sport of choice was hockey growing up lol
Nice...........p.s. i'm not into mma..........I am a professional hip hop artist, check me out on youtube.
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Old 09-25-2012, 11:38 PM   #15
SubWrx13
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Hey thats hella tight too. Nice.
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Old 09-27-2012, 02:42 AM   #16
SubWrx13
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Can someone tell me if trans should shift into all gears smoothly on level surface with engine off?


Seems to be good in all gears with few tries and play

No problems when clutch is engaged.
A little tighter than my last car but no grinds or noises.
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Old 09-27-2012, 02:47 AM   #17
SubWrx13
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Quote:
Originally Posted by GrimmSpeed
Definitely replace the o2 sensor but you should also be looking into a tune. A cobb AP would be an easy and effective solution. You could also work with an E-tuner if you don't have anyone in your area.

Mike
P.s. Grimmspeed if you represent the company, just got in your 3" 2x gaskets for downpipe and theyre badass! Would recommend them to everyone!! Only thing I need now is a decal to represent! Lol
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Old 09-27-2012, 08:18 AM   #18
biodude
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I've found these transmission to be a little notchy at times.. well at least mine has always been

Last edited by biodude; 09-27-2012 at 09:09 AM.
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Old 09-27-2012, 12:12 PM   #19
neo8222
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Yeah the Subaru manuals have A LOT going on in them, I'm not at all surprised that some gears feel a little like that. I got a 6 speed and depending on the gear with engine off sometimes I will have to press the clutch in to go into gear when shifting through the pattern.
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Old 09-27-2012, 06:13 PM   #20
SubWrx13
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Ok I figured it was expected
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Old 09-30-2012, 04:29 PM   #21
SubWrx13
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Got an upstream o2 sensor and cant get old one out. So mother ****ing sick of this car already. What now? Heat shield wont allow for ANYTHING...... Got two different o2 removal sockets an offset and a regular one... No luck!
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Old 09-30-2012, 05:32 PM   #22
socalflat4
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I had to remove mine this weekend to put in a new up pipe and yeah its a pain. Did you pull the plastic/rubber panel in the fender well for easier access? Only managed a half turn before the shield got in the way,adust and repeat. Going to notch the heat shield tomorrow so it won't be an issue next time! Oh and use some anti seize on the new O2 threads.
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Old 10-01-2012, 05:20 PM   #23
SubWrx13
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Hey I just paid a shop $30 to remove it. They broke old one in half and used a socket instead. Its in such a horrid spot. Unfortunately I dont think he put anti sieze on it. Good news! My car lag is gone and she is a bit slower sadly now but runs 100x smoother and shifts without jerkyness as well as overall runnimg much better and quieter. Much bigger difference in the wrx turbo than a bad o2 on my previously tuned Maxima....




Anyways back to the only remainimg boost/drivability problem I hope.. My car is fluttering boost (could just be the cheap gauge itself too)

And its at low throttle/steady throttle only or once I climb to 15psi boost then the flutter starts. Posting youtube video shortly any help appreciated. Will link you all shortly
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Old 10-01-2012, 07:48 PM   #24
SubWrx13
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Ok... Stupid tablet wont let me upload right now.
Here are symptoms:

Idle:
Vacuum 18-20 in idle with no loss or flutter. Very smooth

Idle with throttle:
Moves around a little on vacuum side but no flutter.






PROBLEM IS HERE:
Low acceleration and some normal driving speeds:
Flutter in vacuum side as well as boost side






Mid acceleration: smooth operation to boost and all up boost to 15

Full WOT:
Boost builds smooth to 15psi and after new o2 sensor previous flutter at 15psi seems to have vanished amd car holds 15psi smooth.
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Old 10-02-2012, 01:33 AM   #25
SubWrx13
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Bump? Also noticed it will flutter under low acceleration in idle as well.
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