STi: fuel cut or hesitation in hard 90 degree left-hand turns

Signa · 09-15-2003, 11:51 PM

I've had my 2004 STi for a month now and it's got 2500KMs on it.
The other day I was sitting at the lights waiting to make a left-hand turn. I nailed it while turned left quite hard and the car hesitated for about an eighth of a sec, then kicked back in. It was like a bunny hop of sorts.

If I rev it enough, say above 3000 you don't really notice the problem, and it's worse with the A/C on.

I'm running 94 octane, and it happens bwt 1/3 and a full tank.

My service manager does not know what's causing the problem.

Any ideas?

Thanks!

Signa

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Nivek-CA · 09-16-2003, 01:58 AM

Its defective.

Ok, not really, but I am sure with enough G force, the stock fuel pump cannot overcome the oppossing forces. My friend had a Porsche C4s and during cornering hard the oil pressure would drop significantly because the oil pump could not overcome the G-force.

There I go again, comparing the STI to the porsche.

ANZAC_1915 · 09-16-2003, 09:56 AM

Imprezas seem to have a long history (going back to the GC8) of misadjusted or fault fuel tank pickups.

Treefallen · 09-16-2003, 10:47 AM

I have this happening to me too.

Low revs (~2500), low speed (20mph), 90 degree left turns, then you stamp accelerator coming out of the turn... engine does not cut off, just no power to all wheels for a quarter of a second (seems forever). Real real weird. I hear no diff binding noises, dccd set to auto.

Don't think it has to do with gas...don't think. We should experiment and see if this happens with dccd set in manual mode with diff set to full open... could this be a querk of the auto diff mapping?

Have not reproduced this during a right turn...

Opinions?

bikerboy · 09-16-2003, 05:18 PM

Are you sure it was to the left?

I was at a track day this weekend and when cornering hard to the right with less than 1/3 of a tank induced a momentary sputter or in my case the thing shut completly off as I was entering the next corner! I almost used the STI as a high speed lawn mower.

Mrt does sell a surge tank if you are in my position I think it would be a worthy mod. Check there site it is 1/3 the way down on the subi page.

Bikerboy

ciper · 09-16-2003, 09:39 PM

Dude, seriously SEARCH!!!!!!!!!!!!!!!!!!!!

http://forums.nasioc.com/forums/show...hreadid=415370

http://www.rotaryextreme.com/fuel.html

XT6Wagon · 09-16-2003, 11:44 PM

more to the point subaru has a history of not telling lies with the fuel guage. Most modern cars have a literal 1/4 tank left when it hits empty on the dash. This is to prevent fuel slosh problems, and to keep the fuel pump from overheating.

DanzBorin · 09-17-2003, 12:23 PM

with less than 1/3 of a tank of course a hard right screws you up... that's common in the subaru world... fuel goes to the opposite side of the tank from the pump... badaboom... no gas = no go...

just make sure to keep more fuel in it...

Treefallen · 09-17-2003, 03:25 PM

Car just did it again on a left turn at an "intersection" with low rpm (2500)... right at the "apex", no splutter, its like the car goes into neutral!!!... no power to any of the wheels for about 2/3 of a second. Tank in this case was 2/3 full...

Broeli · 09-17-2003, 04:20 PM

Quote:

with less than 1/3 of a tank of course a hard right screws you up... that's common in the subaru world...

It is? There is no way a car with that much gas should slosh enough to cause it to not pump fuel. I autox with 1/4 to 1/3 tank of gas. Get it checked out...it can't be normal.

DanzBorin · 09-17-2003, 04:22 PM

Quote:

Originally posted by Broeli
It is? There is no way a car with that much gas should slosh enough to cause it to not pump fuel. I autox with 1/4 to 1/3 tank of gas. Get it checked out...it can't be normal.

That's notorious on the RS... tons of us had that problem... we always have to make sure to show up with 1/2 a tank +...

TypeC · 09-17-2003, 04:56 PM

Quote:

Originally posted by Treefallen
Car just did it again on a left turn at an "intersection" with low rpm (2500)... right at the "apex", no splutter, its like the car goes into neutral!!!... no power to any of the wheels for about 2/3 of a second. Tank in this case was 2/3 full...

My '02 WRX does the SAME thing. The fuel pump has never been touched.

Broeli · 09-17-2003, 04:57 PM

Quote:

That's notorious on the RS... tons of us had that problem... we always have to make sure to show up with 1/2 a tank +...

Hmm...that sucks.

WRSport · 09-17-2003, 10:07 PM

I can't honestly believe this OLD, OLD problem is still in the 2004 USDM STI.....When subaru? 2007? '09?

wistful · 09-18-2003, 11:54 AM

fuel starvation sounds like the car is about to shut off. ITs sputtering and dying and can barely sustain idle.

Some people's description just sounds like turbo lag.

Don

rlavalle · 09-19-2003, 01:19 PM

I had a momen t of fuel starvation on the track last Wednesday... Happened on extremely hard cornering at about 1/8 tank.

Seems semi-reasonable.

My pickup may not be perfectly adjusted... I started running out of gas on slow city streets once with 1.5 gallons in the tank.

Careful driving on Empty.

Russ

Treefallen · 09-24-2003, 01:05 PM

Quote:

Originally posted by wistful
fuel starvation sounds like the car is about to shut off. ITs sputtering and dying and can barely sustain idle.

Some people's description just sounds like turbo lag.

Don

Hmmm, in a way it does feel like turbo lag...like its sucking up everything (to the extreme). No such cut-offs at higher rpms...

sackytar · 10-01-2015, 02:35 PM

Sure I'll put this here!
http://www.ludicrous-speed.com/wiki/...fuel_slosh_mod

09-15-2003, 11:51 PM	#1
Signa Scooby Newbie Member#: 43551 Join Date: Sep 2003 Location: Toronto, Canada Vehicle: 2004 STi Blue	fuel cut or hesitation in hard 90 degree left-hand turns I've had my 2004 STi for a month now and it's got 2500KMs on it. The other day I was sitting at the lights waiting to make a left-hand turn. I nailed it while turned left quite hard and the car hesitated for about an eighth of a sec, then kicked back in. It was like a bunny hop of sorts. If I rev it enough, say above 3000 you don't really notice the problem, and it's worse with the A/C on. I'm running 94 octane, and it happens bwt 1/3 and a full tank. My service manager does not know what's causing the problem. Any ideas? Thanks! Signa * Registered users of the site do not see these ads.

09-16-2003, 05:18 PM	#5
bikerboy Scooby Specialist Member#: 5477 Join Date: Apr 2001 Chapter/Region: MWSOC Location: in the garage! Vehicle: 2007 R171.473 2009 SWP Spec B	Are you sure it was to the left? I was at a track day this weekend and when cornering hard to the right with less than 1/3 of a tank induced a momentary sputter or in my case the thing shut completly off as I was entering the next corner! I almost used the STI as a high speed lawn mower. Mrt does sell a surge tank if you are in my position I think it would be a worthy mod. Check there site it is 1/3 the way down on the subi page. Bikerboy Last edited by bikerboy; 09-16-2003 at 05:24 PM.

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09-16-2003, 01:58 AM	#2
Nivek-CA Scooby Specialist Member#: 41415 Join Date: Aug 2003	Its defective. Ok, not really, but I am sure with enough G force, the stock fuel pump cannot overcome the oppossing forces. My friend had a Porsche C4s and during cornering hard the oil pressure would drop significantly because the oil pump could not overcome the G-force. There I go again, comparing the STI to the porsche.

09-16-2003, 09:56 AM	#3
ANZAC_1915 Scooby Guru Member#: 456 Join Date: Oct 1999 Chapter/Region: NWIC Location: Redmond, WA, USA Vehicle: 2008 Forester XT Steel Gray Metallic	Imprezas seem to have a long history (going back to the GC8) of misadjusted or fault fuel tank pickups.

09-16-2003, 10:47 AM	#4
Treefallen Scooby Newbie Member#: 42319 Join Date: Aug 2003 Chapter/Region: Tri-State Location: Lake George, NY Vehicle: 2004 WRX STI Black	I have this happening to me too. Low revs (~2500), low speed (20mph), 90 degree left turns, then you stamp accelerator coming out of the turn... engine does not cut off, just no power to all wheels for a quarter of a second (seems forever). Real real weird. I hear no diff binding noises, dccd set to auto. Don't think it has to do with gas...don't think. We should experiment and see if this happens with dccd set in manual mode with diff set to full open... could this be a querk of the auto diff mapping? Have not reproduced this during a right turn... Opinions?

09-16-2003, 09:39 PM	#6
ciper Scooby Guru Member#: 15543 Join Date: Feb 2002 Vehicle: 555 Having a Subaru shop means too many cars	Dude, seriously SEARCH!!!!!!!!!!!!!!!!!!!! http://forums.nasioc.com/forums/show...hreadid=415370 http://www.rotaryextreme.com/fuel.html

09-16-2003, 11:44 PM	#7
XT6Wagon Scooby Specialist Member#: 524 Join Date: Nov 1999 Location: WA Vehicle: 04 STi White	more to the point subaru has a history of not telling lies with the fuel guage. Most modern cars have a literal 1/4 tank left when it hits empty on the dash. This is to prevent fuel slosh problems, and to keep the fuel pump from overheating.

09-17-2003, 12:23 PM	#8
DanzBorin Subaru Bounty Hunter Moderator Member#: 7131 Join Date: Jun 2001 Chapter/Region: TXIC Location: Houston - Downtown Julie Brown Vehicle: 2015 Outback - Croc Dundee Edition Ice Silver	with less than 1/3 of a tank of course a hard right screws you up... that's common in the subaru world... fuel goes to the opposite side of the tank from the pump... badaboom... no gas = no go... just make sure to keep more fuel in it...

09-17-2003, 03:25 PM	#9
Treefallen Scooby Newbie Member#: 42319 Join Date: Aug 2003 Chapter/Region: Tri-State Location: Lake George, NY Vehicle: 2004 WRX STI Black	Car just did it again on a left turn at an "intersection" with low rpm (2500)... right at the "apex", no splutter, its like the car goes into neutral!!!... no power to any of the wheels for about 2/3 of a second. Tank in this case was 2/3 full...

09-17-2003, 10:07 PM	#14
WRSport Scooby Specialist Member#: 2060 Join Date: Aug 2000 Chapter/Region: BAIC Location: Bay Area Vehicle: 00 2.5RS Coupe 01 black boxster hardtop	I can't honestly believe this OLD, OLD problem is still in the 2004 USDM STI.....When subaru? 2007? '09?

09-18-2003, 11:54 AM	#15
wistful Scooby Specialist Member#: 745 Join Date: Jan 2000 Vehicle: 2004 STi Java Black Pearl	fuel starvation sounds like the car is about to shut off. ITs sputtering and dying and can barely sustain idle. Some people's description just sounds like turbo lag. Don

09-19-2003, 01:19 PM	#16
rlavalle Scooby Specialist Member#: 18384 Join Date: May 2002 Location: Seattle 'burb (Kirkland) Vehicle: 2004 STi: 580 AWHP Java Black Pearl	I had a momen t of fuel starvation on the track last Wednesday... Happened on extremely hard cornering at about 1/8 tank. Seems semi-reasonable. My pickup may not be perfectly adjusted... I started running out of gas on slow city streets once with 1.5 gallons in the tank. Careful driving on Empty. Russ

10-01-2015, 02:35 PM	#18
sackytar Scooby Guru Member#: 149262 Join Date: May 2007 Chapter/Region: MWSOC Location: Grand Rapids MI Vehicle: 03WR rallycarFXTleg PrimerGrey	Sure I'll put this here! http://www.ludicrous-speed.com/wiki/...fuel_slosh_mod