weird boost problem.

soob noob · 10-29-2009, 10:57 PM

my car threw a CEL and said that it was lean in bank one and maybe a bad MAF, after this the car ran like crap it stuttered under stress idled ruff it was weird. i changed the plugs got and got a smoke test done and there was a very very very small leak around the BOV. anywho the CEl went away and and the stutter went away kind of.... it still stutters a tiny bit but not to bad and not as often as it did previously. but when i get to peak boost in any gear it fluctuates like 5psi up and down up and down. and it only stutters when i have the car WOT.

any ideas as to what the hell this is? thanks for any info

the mods are TBE, recirculating BOV and a mild stage 2 tune

soob noob · 10-30-2009, 12:07 AM

anyone? help please?

Tut4u2 · 10-30-2009, 12:08 AM

Clean out your MAF and check for vacuum leaks.

soob noob · 10-30-2009, 12:14 AM

i cleaned the MAF and nothing happened so i bought a new one and nothing happened. got a smoke test and there was a tiny tiny leak around the BOV.. im going to get another gasket for that but is there anything else that could cause the problem?

before i changed the plugs the car was stuttering every time i got above boost. but now it only stutters at WOT. im not getting a CEL though and i just got my stage 2 tune right before i changed the plugs could it be the ECU trying to learn the map?

thanks

soob noob · 10-30-2009, 02:49 AM

anyone else this is really bugging me and any help is MUCH appreciated.

Tut4u2 · 10-30-2009, 08:45 AM

A leak around the bov will cause you not hit full boost.

soob noob · 11-01-2009, 03:33 AM

well tonight my car threw a CEL again i havent been able to see what the code is yet but the code before was P0171 and it said lean in bank 1. the causes could be bad MAF, large vac leak, clogged injector and/or bad fuel pressure.

i changed the MAF and it still drove the same and my vac on my boost gauge is around 17ish so do you guys have any idea as to what to do next? check injectors, fuel pump?

thanks i also read that it could be a bad front o2 sensor....

any help would be awesome

soob noob · 11-01-2009, 02:10 PM

bump................anyone

soob noob · 11-06-2009, 11:25 PM

bump... stutter is gone NO CELs but like i said in my first post the boost is fluctuating up and down up and down.. like im giving it gas and pulling off a little bit.

any ideas? it an 02 wrx stage II stage II light open source tune.. could it be the wastgate?

thanks

Richbmxer87 · 11-06-2009, 11:36 PM

yea man im wondering about this to still waiting on replys on mine that make sense some to but this kinda is a hard thing to look at specially leaks cuz they can be anywhere well i should say if your losing boost its all before the turbo. Ive gotta check my bov. what kind of Bov do you have. i have a Txs RFL and they are known to leak so i think thats where im gonna look im gonna tare my intake manifold off monday and look at the turbo and all. but check that bov

Richbmxer87 · 11-06-2009, 11:37 PM

go back to stock BPV is my recommendation thats what im doing.

soob noob · 11-07-2009, 01:07 AM

i have an agency power recirculating BOV and its tightened all the way down... i had a smoke test done and there was a tiny leak around that and im going to get a new gasket for it but yeah i may end up going to the the BPV but ill have to find one cuz my car came with the BOV on it.

but yeah its weird it just goes up and down up and down... so i dunno thanks for the recommendation

EsubaruJ · 11-07-2009, 02:24 AM

So you are getting boost spikes? The first time that happened to me, I replaced the turbo and it fixed it. The second third and fourth time it happened I just re flashed my ECU and that took care of the problem. Try a reflash, if that doesn't work, see if you can borrow a stock BPV from someone in our local forum. Just start small and don't buy things just to test.

soob noob · 11-07-2009, 03:16 AM

^^^im in YOUR local forum haha... but yeah ill try a re-set tomorrow and see if that helps.. i cant really reflash the map because i dont know what the hell im doing and i dont have the cable to do so...

i had jokerDMX flash a map so maybe ill have to contact him.

*edit* cuz i put this similar thread in the RMIC and got a couple short answers for things to check(which i already checked) so i figured i'd put it here

EsubaruJ · 11-07-2009, 03:40 AM

Oh haha. Yeah get in contact with Joker and see if he will reflash it for you. Just tell him whats going on. And I have a td04 on my EJ20G I have sitting here, we can use the WG on it to see if yours is bad. If its bad then you know what to buy

soob noob · 11-07-2009, 05:20 PM

sweet man yeah ill try and get ahold of him this week..

jakety8 · 11-13-2009, 01:15 PM

my car just did this same sh**. i reflashed twice an the CEL hasnt come on anymore but it idols funny and the boost is hittin wierd, its bouncy. what did u do to fix it?
THanks

soob noob · 11-13-2009, 02:01 PM

my boost problem is still there but i hope to fix that soon.. im really new to this whole car thing this is my first "fast" car haha. so i need to talk to my buddy that knows what he's doin so if i figure it out ill post it up

but i got rid of my stutter by changing plugs and cleaning the MAF with MAF cleaner from autozone...

spinningcain · 11-13-2009, 02:06 PM

get a real tune

mplspilot · 11-13-2009, 06:21 PM

Your tune's boost control most likely needs to be adjusted.

soob noob · 11-13-2009, 07:18 PM

i had the map flashed when i had the horrible stuttering problem... so we couldnt do any logs or anything.. so ill get it re-flashed and logged this weekend i think

Cone Klr · 11-13-2009, 07:44 PM

the tune is your problem get with your tuner and have him look over the wastegate duty cycles they are what will cause your boost to fluctuate at the max levels!!!

soob noob · 11-13-2009, 09:45 PM

thanks man! im trying to get it done asap but he's in the middle of re-building his motor so he's busy and i dont want to be that annoying ******* haha..

but thank you

jakety8 · 11-14-2009, 08:36 PM

i guess i jynxed myself cuz my cel came on again. piss.

soob noob · 11-14-2009, 10:58 PM

have you tried cleaning the MAF? or getting a smoke test? those were the two main things that i did..

10-29-2009, 10:57 PM	#1
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	weird boost problem. my car threw a CEL and said that it was lean in bank one and maybe a bad MAF, after this the car ran like crap it stuttered under stress idled ruff it was weird. i changed the plugs got and got a smoke test done and there was a very very very small leak around the BOV. anywho the CEl went away and and the stutter went away kind of.... it still stutters a tiny bit but not to bad and not as often as it did previously. but when i get to peak boost in any gear it fluctuates like 5psi up and down up and down. and it only stutters when i have the car WOT. any ideas as to what the hell this is? thanks for any info the mods are TBE, recirculating BOV and a mild stage 2 tune

11-07-2009, 03:16 AM	#14
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	^^^im in YOUR local forum haha... but yeah ill try a re-set tomorrow and see if that helps.. i cant really reflash the map because i dont know what the hell im doing and i dont have the cable to do so... i had jokerDMX flash a map so maybe ill have to contact him. edit cuz i put this similar thread in the RMIC and got a couple short answers for things to check(which i already checked) so i figured i'd put it here Last edited by soob noob; 11-07-2009 at 03:34 AM.

11-13-2009, 07:44 PM	#22
Cone Klr Scooby Newbie Member#: 73072 Join Date: Oct 2004 Chapter/Region: NWIC Location: Eugene Vehicle: 02 wrx, 04sti WRB squared!	boost the tune is your problem get with your tuner and have him look over the wastegate duty cycles they are what will cause your boost to fluctuate at the max levels!!!

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10-30-2009, 12:07 AM	#2
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	anyone? help please?

10-30-2009, 12:08 AM	#3
Tut4u2 Scooby Specialist Member#: 40424 Join Date: Jul 2003 Chapter/Region: MAIC Location: Northern VA Vehicle: 02 GDB #2 MBP	Clean out your MAF and check for vacuum leaks.

10-30-2009, 12:14 AM	#4
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	i cleaned the MAF and nothing happened so i bought a new one and nothing happened. got a smoke test and there was a tiny tiny leak around the BOV.. im going to get another gasket for that but is there anything else that could cause the problem? before i changed the plugs the car was stuttering every time i got above boost. but now it only stutters at WOT. im not getting a CEL though and i just got my stage 2 tune right before i changed the plugs could it be the ECU trying to learn the map? thanks

10-30-2009, 02:49 AM	#5
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	anyone else this is really bugging me and any help is MUCH appreciated.

10-30-2009, 08:45 AM	#6
Tut4u2 Scooby Specialist Member#: 40424 Join Date: Jul 2003 Chapter/Region: MAIC Location: Northern VA Vehicle: 02 GDB #2 MBP	A leak around the bov will cause you not hit full boost.

11-01-2009, 03:33 AM	#7
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	well tonight my car threw a CEL again i havent been able to see what the code is yet but the code before was P0171 and it said lean in bank 1. the causes could be bad MAF, large vac leak, clogged injector and/or bad fuel pressure. i changed the MAF and it still drove the same and my vac on my boost gauge is around 17ish so do you guys have any idea as to what to do next? check injectors, fuel pump? thanks i also read that it could be a bad front o2 sensor.... any help would be awesome

11-01-2009, 02:10 PM	#8
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	bump................anyone

11-06-2009, 11:25 PM	#9
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	bump... stutter is gone NO CELs but like i said in my first post the boost is fluctuating up and down up and down.. like im giving it gas and pulling off a little bit. any ideas? it an 02 wrx stage II stage II light open source tune.. could it be the wastgate? thanks

11-06-2009, 11:36 PM	#10
Richbmxer87 Scooby Newbie Member#: 183707 Join Date: Jul 2008 Chapter/Region: MWSOC Location: western KY Vehicle: 2005 WRX BLK	yea man im wondering about this to still waiting on replys on mine that make sense some to but this kinda is a hard thing to look at specially leaks cuz they can be anywhere well i should say if your losing boost its all before the turbo. Ive gotta check my bov. what kind of Bov do you have. i have a Txs RFL and they are known to leak so i think thats where im gonna look im gonna tare my intake manifold off monday and look at the turbo and all. but check that bov

11-06-2009, 11:37 PM	#11
Richbmxer87 Scooby Newbie Member#: 183707 Join Date: Jul 2008 Chapter/Region: MWSOC Location: western KY Vehicle: 2005 WRX BLK	go back to stock BPV is my recommendation thats what im doing.

11-07-2009, 01:07 AM	#12
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	i have an agency power recirculating BOV and its tightened all the way down... i had a smoke test done and there was a tiny leak around that and im going to get a new gasket for it but yeah i may end up going to the the BPV but ill have to find one cuz my car came with the BOV on it. but yeah its weird it just goes up and down up and down... so i dunno thanks for the recommendation

11-07-2009, 02:24 AM	#13
EsubaruJ Scooby Specialist Member#: 200008 Join Date: Jan 2009 Chapter/Region: RMIC Location: Salt Lake City Vehicle: 93 ImprezaEJ20GRHD 01XJcrawler02WRXbroken	So you are getting boost spikes? The first time that happened to me, I replaced the turbo and it fixed it. The second third and fourth time it happened I just re flashed my ECU and that took care of the problem. Try a reflash, if that doesn't work, see if you can borrow a stock BPV from someone in our local forum. Just start small and don't buy things just to test.

11-07-2009, 03:40 AM	#15
EsubaruJ Scooby Specialist Member#: 200008 Join Date: Jan 2009 Chapter/Region: RMIC Location: Salt Lake City Vehicle: 93 ImprezaEJ20GRHD 01XJcrawler02WRXbroken	Oh haha. Yeah get in contact with Joker and see if he will reflash it for you. Just tell him whats going on. And I have a td04 on my EJ20G I have sitting here, we can use the WG on it to see if yours is bad. If its bad then you know what to buy

11-07-2009, 05:20 PM	#16
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	sweet man yeah ill try and get ahold of him this week..

11-13-2009, 01:15 PM	#17
jakety8 Scooby Newbie Member#: 225777 Join Date: Oct 2009 Chapter/Region: NWIC Location: oregon Vehicle: 2005 Wrx wagon Silver	my car just did this same sh**. i reflashed twice an the CEL hasnt come on anymore but it idols funny and the boost is hittin wierd, its bouncy. what did u do to fix it? THanks

11-13-2009, 02:01 PM	#18
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	my boost problem is still there but i hope to fix that soon.. im really new to this whole car thing this is my first "fast" car haha. so i need to talk to my buddy that knows what he's doin so if i figure it out ill post it up but i got rid of my stutter by changing plugs and cleaning the MAF with MAF cleaner from autozone...

11-13-2009, 02:06 PM	#19
spinningcain Scooby Specialist Member#: 176490 Join Date: Apr 2008 Chapter/Region: SWIC Location: Las Vegas Vehicle: 2004 WRX VF39 silver	get a real tune

11-13-2009, 06:21 PM	#20
mplspilot Scooby Newbie Member#: 229889 Join Date: Nov 2009	Your tune's boost control most likely needs to be adjusted.

11-13-2009, 07:18 PM	#21
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	i had the map flashed when i had the horrible stuttering problem... so we couldnt do any logs or anything.. so ill get it re-flashed and logged this weekend i think

11-13-2009, 09:45 PM	#23
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	thanks man! im trying to get it done asap but he's in the middle of re-building his motor so he's busy and i dont want to be that annoying ******* haha.. but thank you

11-14-2009, 08:36 PM	#24
jakety8 Scooby Newbie Member#: 225777 Join Date: Oct 2009 Chapter/Region: NWIC Location: oregon Vehicle: 2005 Wrx wagon Silver	i guess i jynxed myself cuz my cel came on again. piss.

11-14-2009, 10:58 PM	#25
soob noob Scooby Newbie Member#: 220158 Join Date: Aug 2009 Chapter/Region: RMIC Location: santaquin/orem Vehicle: 02 bugeye murdered out	have you tried cleaning the MAF? or getting a smoke test? those were the two main things that i did..