Can boost leak cause cylinder misfire?

Shanesajda · 11-09-2017, 12:56 AM

I've been getting a code for a cylinder 2 misfire, wondering if boost leak could be a factor. I have thought the car has been sluggish. Now it's sputtering at around 3500rpm/16psi (hence the misfire)
It's an 05 saab 92x, with Blouch 16g turbo upgrade, STI TMIC, 1000cc injectors, fuel pump, exhaust etc. Its a factory auto transmission as well.

The car isn't as fast as I thought itd be. I know turbo lag is real, it just seems more than that to me

Any way to check for boost leak?

Shanesajda · 11-09-2017, 12:59 AM

Just thought I'd mentioned it's obviously shop tuned as well. And I have a boost control solenoid installed

Samurai Jack · 11-09-2017, 08:15 AM

Step #1 - Go back to your tuner
Step #2 - See Step #1

What? No CEL code?
So many things could cause a misfire.

subaru_gc8 · 11-09-2017, 02:47 PM

i had a problem like that, the car would stop reving if I went into boost. no cel light or anything.. anways it ended up being the coils 2 of the 4 went bad but it took like a long time to figure it out

Shanesajda · 11-09-2017, 05:40 PM

Yea I'm getting a cel, it comes and goes. I'm gonna check the coils and plugs

Shanesajda · 11-10-2017, 01:05 PM

My gas mileage dropped quite a bit too. I was at 22 a couple tanks ago, now averaging 17.6. Mostly highway

Shanesajda · 11-10-2017, 05:53 PM

Just found a huge fuel leak

Shanesajda · 11-11-2017, 02:39 PM

Pouring out of the injectors on both sides. Bad O Rings??

foresterstb2001 · 11-14-2017, 01:25 PM

I'm having a similar problem with my stb and thinking it might be an air leak... such a pain trying to trouble shoot. Best of luck!

JayTV1027 · 01-23-2021, 09:44 PM

Not to bring this back from the dead but what was the solution to your problem?

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11-09-2017, 12:56 AM	#1
Shanesajda Scooby Newbie Member#: 460045 Join Date: Dec 2016	Can boost leak cause cylinder misfire? I've been getting a code for a cylinder 2 misfire, wondering if boost leak could be a factor. I have thought the car has been sluggish. Now it's sputtering at around 3500rpm/16psi (hence the misfire) It's an 05 saab 92x, with Blouch 16g turbo upgrade, STI TMIC, 1000cc injectors, fuel pump, exhaust etc. Its a factory auto transmission as well. The car isn't as fast as I thought itd be. I know turbo lag is real, it just seems more than that to me Any way to check for boost leak?

11-09-2017, 12:59 AM	#2
Shanesajda Scooby Newbie Member#: 460045 Join Date: Dec 2016	Just thought I'd mentioned it's obviously shop tuned as well. And I have a boost control solenoid installed

11-09-2017, 08:15 AM	#3
Samurai Jack Scooby Guru Member#: 21145 Join Date: Jul 2002 Chapter/Region: NESIC Location: Not in my own time Vehicle: 2002 Enemy of Aku	Step #1 - Go back to your tuner Step #2 - See Step #1 What? No CEL code? So many things could cause a misfire.

11-09-2017, 02:47 PM	#4
subaru_gc8 Scooby Specialist Member#: 29292 Join Date: Nov 2002 Chapter/Region: SCIC Location: Orange County CA Vehicle: 2004 WRX wagon silver	i had a problem like that, the car would stop reving if I went into boost. no cel light or anything.. anways it ended up being the coils 2 of the 4 went bad but it took like a long time to figure it out

11-09-2017, 05:40 PM	#5
Shanesajda Scooby Newbie Member#: 460045 Join Date: Dec 2016	Yea I'm getting a cel, it comes and goes. I'm gonna check the coils and plugs

11-10-2017, 01:05 PM	#6
Shanesajda Scooby Newbie Member#: 460045 Join Date: Dec 2016	My gas mileage dropped quite a bit too. I was at 22 a couple tanks ago, now averaging 17.6. Mostly highway

11-10-2017, 05:53 PM	#7
Shanesajda Scooby Newbie Member#: 460045 Join Date: Dec 2016	Just found a huge fuel leak

11-11-2017, 02:39 PM	#8
Shanesajda Scooby Newbie Member#: 460045 Join Date: Dec 2016	Pouring out of the injectors on both sides. Bad O Rings??

11-14-2017, 01:25 PM	#9
foresterstb2001 Scooby Newbie Member#: 477704 Join Date: Nov 2017	I'm having a similar problem with my stb and thinking it might be an air leak... such a pain trying to trouble shoot. Best of luck!

01-23-2021, 09:44 PM	#10
JayTV1027 Scooby Newbie Member#: 503227 Join Date: Jun 2019 Chapter/Region: NWIC Location: Seattle, Washington Vehicle: 2009 Impreza WRX Sterling Silver	Not to bring this back from the dead but what was the solution to your problem?