Running rich between shifts

candyredfish · 06-06-2013, 01:11 PM

Just noticed my car is starting to run rich between shifts or whenever I let off the accelerator. I'm not talking like little spikes, it will go full rich for a split second and then go full lean which is to be expected.
I just cleaned the MAF to see if that would help, it didnt.
Don't really know where to go next.
A/F ratios are all observed from an AEM UEGO wideband with sensor ~1 month old

Background of the car:
Brand new EJ205 with ~800 miles on the block
td04
02 wrx stock TMIC and stock BPV(?)
turbo back exhaust
Cobb OTS stage 2 map
Leightweight fly wheel (don't know if this makes a difference)

another side note, recently took the intercooler off to put a heat shield on, car seemed to run fine afterwards so I assume everything was connected correctly.

Anyways I hope someone can help! Getting a little frustrated with the subie lately. Thanks all!

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cosseywrx · 06-06-2013, 01:25 PM

Possible leak when you reinstalled and is the ? Mean you dont know if you have a stock bpv?

ierichuljev · 06-06-2013, 01:29 PM

So you have a bov venting to the atmosphere ?

cosseywrx · 06-06-2013, 01:30 PM

^^THATS what im thinking

candyredfish · 06-06-2013, 01:43 PM

Quote:

Originally Posted by cosseywrx

Possible leak when you reinstalled and is the ? Mean you dont know if you have a stock bpv?

The ? Mark is idk what it's called, but it is the stock unit that comes from the factory, so I should check all my connections on the intercooler?

cosseywrx · 06-06-2013, 01:50 PM

I would. Got a smoke tester that would work the best.

candyredfish · 06-06-2013, 10:45 PM

Just an update, I'm running almost perfect stoich while cruising so is it still safe to drive? I'll be conducting a boost leak test as soon as I can gather the materials to make a tester

cosseywrx · 06-06-2013, 11:19 PM

Do some data logs. Post them. Do a learning shot as well

candyredfish · 06-06-2013, 11:47 PM

No way to data log

mechatricity · 06-07-2013, 09:05 AM

Quote:

Originally Posted by candyredfish

No way to data log

You don't have an accessport?

candyredfish · 06-07-2013, 11:23 AM

Quote:

Originally Posted by mechatricity

You don't have an accessport?

AP v1

WRXt4cy · 06-07-2013, 11:29 AM

Are you certain this is new behavior?

Its fairly normal to see this, its called injector overrun. When you let off the throttle, the injectors don't immediately shut off; they keep spraying for a bit. The quicker you let off the throttle, the richer you will see.

I believe its an emissions strategy to cool the down the catalytic converters but I'm not certain about that.

candyredfish · 06-07-2013, 12:49 PM

Quote:

Originally Posted by WRXt4cy

Are you certain this is new behavior?

Its fairly normal to see this, its called injector overrun. When you let off the throttle, the injectors don't immediately shut off; they keep spraying for a bit. The quicker you let off the throttle, the richer you will see.

I believe its an emissions strategy to cool the down the catalytic converters but I'm not certain about that.

To be honest I dont know how "new" this condition is. I remember when i first installed the wideband I monitored it and I dont think i remember this but it could be wrong. I just was paying attention to it the other day and it kind of freaked me out. Seems like my wideband has turned into a worry-band gauge

tec_41 · 06-07-2013, 01:41 PM

Quote:

Originally Posted by candyredfish

Seems like my wideband has turned into a worry-band gauge

They always do

. When I installed one in my old Talon I couldn't stop worrying...To be fair, it did blow up eventually.

Gotta cover the basics, but the stock BPV (bypass valve) is recirculating, correct? Wouldn't hurt to throw up a pic of your engine bay if you aren't sure.

candyredfish · 06-07-2013, 02:24 PM

However it comes from the factory it is but I'll throw up a picture tomorrow, working the rest of the day

but I also ordered a boost leak test kit (way too lazy to make my own lol)

mechatricity · 06-07-2013, 04:34 PM

2nd'd on the worry-band haha. I think you may find that there's nothing wrong...

...but a boost leak tester is a great tool to have.

candyredfish · 06-07-2013, 05:56 PM

Quote:

Originally Posted by mechatricity

2nd'd on the worry-band haha. I think you may find that there's nothing wrong...

...but a boost leak tester is a great tool to have.

Exactly, that's why I didn't mind spending a couple extra bucks getting a quality took

06-06-2013, 01:11 PM	#1
candyredfish Scooby Newbie Member#: 323959 Join Date: Jun 2012 Chapter/Region: MWSOC Location: IL Vehicle: 02 WRX Sedona Red Pearl	Running rich between shifts Just noticed my car is starting to run rich between shifts or whenever I let off the accelerator. I'm not talking like little spikes, it will go full rich for a split second and then go full lean which is to be expected. I just cleaned the MAF to see if that would help, it didnt. Don't really know where to go next. A/F ratios are all observed from an AEM UEGO wideband with sensor ~1 month old Background of the car: Brand new EJ205 with ~800 miles on the block td04 02 wrx stock TMIC and stock BPV(?) turbo back exhaust Cobb OTS stage 2 map Leightweight fly wheel (don't know if this makes a difference) another side note, recently took the intercooler off to put a heat shield on, car seemed to run fine afterwards so I assume everything was connected correctly. Anyways I hope someone can help! Getting a little frustrated with the subie lately. Thanks all! * Registered users of the site do not see these ads.

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06-06-2013, 01:25 PM	#2
cosseywrx Scooby Specialist Member#: 276443 Join Date: Mar 2011 Chapter/Region: AKIC Location: Fairbanks, AK Vehicle: 2005 Wrexy OBP	Possible leak when you reinstalled and is the ? Mean you dont know if you have a stock bpv?

06-06-2013, 01:29 PM	#3
ierichuljev Scooby Newbie Member#: 330442 Join Date: Aug 2012 Chapter/Region: TXIC Location: Spring, TEXAS Vehicle: 2002 WRX Midnight Black Pearl	So you have a bov venting to the atmosphere ?

06-06-2013, 01:30 PM	#4
cosseywrx Scooby Specialist Member#: 276443 Join Date: Mar 2011 Chapter/Region: AKIC Location: Fairbanks, AK Vehicle: 2005 Wrexy OBP	^^THATS what im thinking

06-06-2013, 01:50 PM	#6
cosseywrx Scooby Specialist Member#: 276443 Join Date: Mar 2011 Chapter/Region: AKIC Location: Fairbanks, AK Vehicle: 2005 Wrexy OBP	I would. Got a smoke tester that would work the best.

06-06-2013, 10:45 PM	#7
candyredfish Scooby Newbie Member#: 323959 Join Date: Jun 2012 Chapter/Region: MWSOC Location: IL Vehicle: 02 WRX Sedona Red Pearl	Just an update, I'm running almost perfect stoich while cruising so is it still safe to drive? I'll be conducting a boost leak test as soon as I can gather the materials to make a tester

06-06-2013, 11:19 PM	#8
cosseywrx Scooby Specialist Member#: 276443 Join Date: Mar 2011 Chapter/Region: AKIC Location: Fairbanks, AK Vehicle: 2005 Wrexy OBP	Do some data logs. Post them. Do a learning shot as well

06-06-2013, 11:47 PM	#9
candyredfish Scooby Newbie Member#: 323959 Join Date: Jun 2012 Chapter/Region: MWSOC Location: IL Vehicle: 02 WRX Sedona Red Pearl	No way to data log

06-07-2013, 11:29 AM	#12
WRXt4cy Scooby Specialist Member#: 172698 Join Date: Feb 2008 Chapter/Region: MWSOC Location: Des Moines, IA Vehicle: 11 STi Stg2 E85 02 v8 Spec C E85	Are you certain this is new behavior? Its fairly normal to see this, its called injector overrun. When you let off the throttle, the injectors don't immediately shut off; they keep spraying for a bit. The quicker you let off the throttle, the richer you will see. I believe its an emissions strategy to cool the down the catalytic converters but I'm not certain about that.

06-07-2013, 02:24 PM	#15
candyredfish Scooby Newbie Member#: 323959 Join Date: Jun 2012 Chapter/Region: MWSOC Location: IL Vehicle: 02 WRX Sedona Red Pearl	However it comes from the factory it is but I'll throw up a picture tomorrow, working the rest of the day but I also ordered a boost leak test kit (way too lazy to make my own lol)

06-07-2013, 04:34 PM	#16
mechatricity Scooby Specialist Member#: 290592 Join Date: Aug 2011 Chapter/Region: TXIC Location: Dallas, TX Vehicle: 2006 WRX Wagon 2004 WRX Wagon	2nd'd on the worry-band haha. I think you may find that there's nothing wrong... ...but a boost leak tester is a great tool to have.