Welcome to the North American Subaru Impreza Owners Club Saturday December 27, 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 2.0L Turbo Powertrain (EJ Series Factory 2.0L 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 12-31-2009, 01:55 AM   #1
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default Hesitation at 5k rpms under boost

Today on a 190 mile trip home, after I stopped halfway home, my car started hesitating every time I hit 5k rpms and try to boost. It's never done this before and i'm around 1100 miles into a fresh ECU reset. Could this be something as simple as spark plugs or is it a sign of something worse such as turbo failure(i've been feeling that coming on for a while) or boost/vaccum leak? I know the plugs do need replaced, i've had a bunch of misfires on them from the previous owner's "home tuning".

I am barely able to boost over 10-11psi at WOT in any gear, but it's been that way since the ECU reset.

2005 WRX
Unknown BOV (plan to remove asap)
Invidia Bellmouth catless DP
K&N Panel Filter
No tune whatsoever
UTEC installed but not currently in use
* Registered users of the site do not see these ads.
chuckrfish is offline   Reply With Quote
Old 12-31-2009, 01:59 AM   #2
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

Also, if I attempt to keep accelerating after the hesitation starts, the car will kinda stutter it's way to the redline. Seems to run alright under 5k though, even with boost.
chuckrfish is offline   Reply With Quote
Old 12-31-2009, 04:05 AM   #3
soob noob
Scooby Specialist
 
Member#: 220158
Join Date: Aug 2009
Chapter/Region: RMIC
Location: santaquin/orem
Vehicle:
02 bugeye
medamullet tuned

Default

ive had a wierd problem similar to this. first i changed the plugs and cleaned my MAF and that helped but it was still there.. now im finding out it was the tune thats on my car. so you could start with cleaning your MAF with cleaner from autozone thats probably the cheapest starting point
soob noob is offline   Reply With Quote
Old 12-31-2009, 09:08 AM   #4
scprs
Scooby Specialist
 
Member#: 172359
Join Date: Feb 2008
Chapter/Region: MAIC
Location: virginia
Vehicle:
2005 STi
PSM

Default

check the vacum hose for the pressure regulator.
scprs is offline   Reply With Quote
Old 12-31-2009, 09:39 AM   #5
penusai
Scooby Specialist
 
Member#: 102808
Join Date: Dec 2005
Chapter/Region: Tri-State
Location: Queens, NY
Vehicle:
2002 v8 EJ207
v7 6spd FP Green

Default

yeah, you need to get rid of the BOV and get it tuned.
penusai is offline   Reply With Quote
Old 12-31-2009, 12:18 PM   #6
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

Quote:
Originally Posted by penusai View Post
yeah, you need to get rid of the BOV and get it tuned.
yes, it's the most generic looking BOV i've ever seen and I've only heard it blow off twice in the 3 months of owning the car, any wonder things aren't running right..

Thanks for the help and keep the ideas coming. I'll try and find some MAF cleaner today, and I'll get around to changing the plugs later.

Any idea if trying to run a base stage 1 map on the UTEC would do me any good, or would that just complicate things?
chuckrfish is offline   Reply With Quote
Old 12-31-2009, 02:18 PM   #7
Flyin_Hayn
Scooby Specialist
 
Member#: 175031
Join Date: Mar 2008
Chapter/Region: NWIC
Location: Sauce Town, OR
Vehicle:
2005 PSM STi
Stage2 303awhp / 331awtq

Default

Its your bov. Gvet it off.
Are you having idleing issues aswell???
The bov unless its a hybrid bpv ****s with your maf readings and in somecases shortly after installation can make the car run funky in many different ways.
Also, the car can be hesitating under high rpm cause the bov suck so much its not able to hold boost at high pressure. Stick with the stock bpv until you find a hybrid, than tune it with the hybrid.
Flyin_Hayn is offline   Reply With Quote
Old 12-31-2009, 03:56 PM   #8
spinningcain
Scooby Specialist
 
Member#: 176490
Join Date: Apr 2008
Chapter/Region: SWIC
Location: Las Vegas
Vehicle:
2005 STI
WRB

Default

Tune........
spinningcain is offline   Reply With Quote
Old 12-31-2009, 04:46 PM   #9
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

I don't doubt that any of the mentioned suggestions are wrong, just another thought, it's never done this before and i've had the car for over 11,000 miles. but yeah, i'm looking for the stock BPV, the BOV on there now looks like a full vent to atmosphere, i know it's a POS. I'm looking to get it tuned but I can't find anywhere close and it's gonna cost more than I can afford right now...

I'm not having any idling issues, nor have I had any. I do think it's more the bov leaking than anything because for the last month or so I haven't been able to top 10psi, where I was easily hitting 15-16 with my stage 2 map for a week or so back in september. since then i've been trying to get it back to stock before I ruin things by not being tuned.

Again, thanks for all the input guys, it's hard to find answers where I live, nobody has these cars.
chuckrfish is offline   Reply With Quote
Old 12-31-2009, 04:53 PM   #10
DragginFrame
Scooby Specialist
 
Member#: 188641
Join Date: Sep 2008
Chapter/Region: MAIC
Location: State College, PA
Vehicle:
2005 OBP WRX, 03 EP3
Juiced 93 Ranger

Default

Like everyone else has said, it's your BOV. I see you're from State College....and you're right, very few people around have these... none of the tuning shops around work with Subarus---try an e-tuner or pick up a used Accessport, this and a stock BPV may clear up your issues
DragginFrame is offline   Reply With Quote
Old 12-31-2009, 04:58 PM   #11
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

Hopefully it does. A lot of people say about getting an accessport and all that. I bought the car with the UTEC already installed and functional. Know anyone that could help me out with that? I'd rather make that work, but if I have to, i'll go accessport.
chuckrfish is offline   Reply With Quote
Old 12-31-2009, 05:45 PM   #12
Flyin_Hayn
Scooby Specialist
 
Member#: 175031
Join Date: Mar 2008
Chapter/Region: NWIC
Location: Sauce Town, OR
Vehicle:
2005 PSM STi
Stage2 303awhp / 331awtq

Default

Your best bet is to get a stock bpv and an accesport and download a reputable stage2 map for your climate.

Another thing, the ecu slowely leaRns feul trims, MAF readings etc. The bov will effect performance over time. Different cars have different problems, I would guess yore would be hitting full boost. When York MAF doesn't read air exiting the intake it thinks something is wrong and performs in some sort of limp mode, ie run rich, fuel cut to prevent further damage.
Your poor 2.0l is just confused: ( haha.
Just take it easy and get the bpv on. Get on off eBay or something. I bet you don't even need a tune.
GL brother
Flyin_Hayn is offline   Reply With Quote
Old 01-01-2010, 10:32 PM   #13
ManbroVonDudenhoff
Scooby Newbie
 
Member#: 175534
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Detroit
Vehicle:
'02 WRX Wagon
PSM

Default

TO ADD TO THIS:

K&N filter oil blows through and coats the MAF, as seen above the MAF cleaner will help but from experience just run the OEM subaru panel filter if you're running with an airbox still....they work great.

easy fix though man, likely a dirty MAF to be the cause, fresh plugs wont hurt either.
ManbroVonDudenhoff is offline   Reply With Quote
Old 01-03-2010, 06:41 PM   #14
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

Just an update, I finally got around to changing the oil and cleaning the MAF sensor. God was it dirty. One side of the bulb was amber, and the other side was complete black lol! It's all clean, reassembled and i'm going to take it for a drive in a little bit and see if it worked. By the looks of things, i'd guess that would be enough to make my car run funny!

Great advice guys! Thanks!
chuckrfish is offline   Reply With Quote
Old 01-07-2010, 07:05 AM   #15
silvwrx
Scooby Newbie
 
Member#: 145528
Join Date: Apr 2007
Chapter/Region: Tri-State
Location: Holtwood, Pa
Vehicle:
2011 Impreza WRX
Silver

Default

Has your hesitation problem been resolved?
silvwrx is offline   Reply With Quote
Old 01-07-2010, 03:25 PM   #16
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

Nope, although I was checking over my vacuum lines and also found out that I have no restrictor pill, so i've got one on the way from a dealer... I figure that would also be a good cause of never hitting stock boost and hitting a wall when full boost should be happening! The more I dig, the more retarded problems I find!
chuckrfish is offline   Reply With Quote
Old 01-07-2010, 03:29 PM   #17
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

But anyway, the MAF clean made a significant difference in how smooth the car runs now and improved my gas mileage as well! probably because i'm not able to boost very much lol.
chuckrfish is offline   Reply With Quote
Old 01-08-2010, 09:03 AM   #18
silvwrx
Scooby Newbie
 
Member#: 145528
Join Date: Apr 2007
Chapter/Region: Tri-State
Location: Holtwood, Pa
Vehicle:
2011 Impreza WRX
Silver

Default

Well I had that same issue a while back and just wanted to let you know that the amber bulb is not the maf but i believe some sort of ambient air sensor the maf sensor is actually locted on behind the bulb up in the tube. Spray some maf cleaner up in the tube and you will see the sensor. I spent a lot of money and time trying to fix the problem because I thought I cleaned the maf when i didnt. After I figured this out and cleaned it it ran perfectly. Hope this helps.
silvwrx is offline   Reply With Quote
Old 01-08-2010, 09:33 AM   #19
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

Awesome and thanks, I'll do that as well. Between that and the restrictor pill, I oughta be set after I get the stock BPV back on!
chuckrfish is offline   Reply With Quote
Old 01-08-2010, 11:46 AM   #20
Haelan
Scooby Specialist
 
Member#: 151045
Join Date: Jun 2007
Location: NW Indiana
Vehicle:
2013 Subaru STI
CBP

Default

Quote:
Originally Posted by silvwrx View Post
Well I had that same issue a while back and just wanted to let you know that the amber bulb is not the maf but i believe some sort of ambient air sensor the maf sensor is actually locted on behind the bulb up in the tube. Spray some maf cleaner up in the tube and you will see the sensor. I spent a lot of money and time trying to fix the problem because I thought I cleaned the maf when i didnt. After I figured this out and cleaned it it ran perfectly. Hope this helps.
^+1

That 'amber bulb' is the intake air temperature sensor. There are two small wires inside the MAF tube--those determine airflow mass. They are fragile so be careful when you spray cleaner in there.
Haelan is offline   Reply With Quote
Old 01-09-2010, 03:42 PM   #21
chuckrfish
Scooby Newbie
 
Member#: 226560
Join Date: Oct 2009
Chapter/Region: Tri-State
Location: State College, PA
Vehicle:
2005 WRX
WR Blue and Black

Default

alright silvwrx, you were absolutely right on about spraying up the tube. I just did that and went for a cruise and wow. No hesitation at all, no stutters, no BS. All i'm waiting for is to order the restrictor pill from the dealer on monday and i'm back in shape! Thanks for all your help everybody!
chuckrfish is offline   Reply With Quote
Old 01-12-2010, 08:05 AM   #22
silvwrx
Scooby Newbie
 
Member#: 145528
Join Date: Apr 2007
Chapter/Region: Tri-State
Location: Holtwood, Pa
Vehicle:
2011 Impreza WRX
Silver

Default

Glad it worked for you.
silvwrx is offline   Reply With Quote
Old 01-19-2010, 06:35 AM   #23
_MFB_
Scooby Newbie
 
Member#: 219676
Join Date: Aug 2009
Chapter/Region: International
Location: The Philippines
Vehicle:
09 Forester XT
Steel Silver

Default

I'll clean mine later and hope to see the hesitation (intermittent) go away.
_MFB_ is offline   Reply With Quote
Old 01-26-2010, 12:16 PM   #24
xtremsiege2
Scooby Newbie
 
Member#: 232721
Join Date: Dec 2009
Chapter/Region: Tri-State
Location: CT
Vehicle:
2013 STI Sedan
Black

Default

Quote:
Originally Posted by _MFB_ View Post
I'll clean mine later and hope to see the hesitation (intermittent) go away.
+1 on this, I think this is my problem now. I got bored the other night and wanted to see how a bov would sound on my stock wrx, just for some rev's. Didn't work out so hot, put the stock one back on and car had a slight boost leak, took off the intercooler and made sure the stock bov lower elbow was connected right and the clamp was tight(also put on a new belt and checked some things over, reset ecu and the motor sounds good, but isn't boosting well. It's idling fine, but doesn't pull well and stutters it's way to 5000 rpm.

Any other places to check? Kind of sounds like a boost leak when accelerating also.
xtremsiege2 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
Car Hesitates And Stumbles At 5k Rpm applesti Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 17 10-06-2008 11:32 AM
My car is hesitating at 5K+ rpm... tEkkGOD Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 4 04-23-2004 10:14 AM
Hesitation at 3K rpm/light boost - dealer fixed rodon Service & Maintenance 9 09-03-2003 02:29 PM
Hesitation through 5k rpm in wrx wrxboy02 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 41 01-03-2002 11:05 PM


All times are GMT -4. The time now is 06:56 PM.


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.