Welcome to the North American Subaru Impreza Owners Club Friday July 11, 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 > Normally Aspirated Powertrain

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 04-16-2002, 09:40 AM   #1
artulo
Scooby Newbie
 
Member#: 13243
Join Date: Dec 2001
Chapter/Region: MWSOC
Location: underneath the dash
Vehicle:
2010 Legacy
metallic grey

Question Performance Issues

Hey folks --

I'm just looking for a little insight into what may be going on. I'm pretty sure I know but want some advice first. Some of the descriptions may be a little vague but bear with me.

My '01 RS has been acting a little "off" the past week or so, in that it takes 5-10 secs of cranking to get it started sometimes (though not often).

Second, the idle seems rougher. Not a lot but it's noticeable. When I turn it off it doesn't stop idling right away, goes for maybe 0.5-1 sec kinda like a diesel but not quite the same.

Also, my "butt-dyno" says that the pull to redline really isn't what it should be. I rarely even get to 5000-5500 so it's not like I'm bouncing off the red constantly, mostly staying 2500-4000 RPM.

My gas mileage for the last 3 tankfuls has been a pitiful 17 MPG! I realize that these aren't the most fuel economizing vehicles, and my car IS used as a daily driver for city driving a lot, but 17??

The car just went over 24k miles, so I'm guessing it's time for a little tune up maybe? Get rid of those champion plugs, get new wires, etc?

Oh and the car is completely stock. Mo mods whatsoever.

Any insight?? Or am I just crazy? It is under arranty, so take it to the dealer?
* Registered users of the site do not see these ads.
artulo is offline   Reply With Quote
Old 04-16-2002, 11:55 AM   #2
Yebisu69
Scooby Specialist
 
Member#: 11989
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
2006 LegacyGT LTD
Brilliant Metallic Silver

Default Re: Performance Issues

Quote:
Originally posted by artulo
Hey folks --

I'm just looking for a little insight into what may be going on. I'm pretty sure I know but want some advice first. Some of the descriptions may be a little vague but bear with me.

My '01 RS has been acting a little "off" the past week or so, in that it takes 5-10 secs of cranking to get it started sometimes (though not often).

Second, the idle seems rougher. Not a lot but it's noticeable. When I turn it off it doesn't stop idling right away, goes for maybe 0.5-1 sec kinda like a diesel but not quite the same.

Also, my "butt-dyno" says that the pull to redline really isn't what it should be. I rarely even get to 5000-5500 so it's not like I'm bouncing off the red constantly, mostly staying 2500-4000 RPM.

My gas mileage for the last 3 tankfuls has been a pitiful 17 MPG! I realize that these aren't the most fuel economizing vehicles, and my car IS used as a daily driver for city driving a lot, but 17??

The car just went over 24k miles, so I'm guessing it's time for a little tune up maybe? Get rid of those champion plugs, get new wires, etc?

Oh and the car is completely stock. Mo mods whatsoever.

Any insight?? Or am I just crazy? It is under arranty, so take it to the dealer?
I think you due for a tune up. I have read that the Champion plugs weren't so good when they were new.

BTW I get about 18 mpg in the city with just a ganzflow intake.

I don't think wearable items are covered under warranty, (belts, hoses, etc)
Yebisu69 is offline   Reply With Quote
Old 04-16-2002, 12:00 PM   #3
Midwayman
Scooby Specialist
 
Member#: 1997
Join Date: Jul 2000
Chapter/Region: MWSOC
Location: Des Plaines, IL
Vehicle:
2006 Acura TL 6spd
STMGM6 alumni

Default

Might be the o2.....
Midwayman is offline   Reply With Quote
Old 04-16-2002, 12:10 PM   #4
Jademonkey
Scooby Specialist
 
Member#: 9213
Join Date: Aug 2001
Location: My grandma was 6' 6"
Vehicle:
2000 RS
Red

Default

I'd go for a tune up. 17 mpg seems low. What octane gas do you run? You should be using 87. Before I started modding my car, i got 22 mpg for city driving, now I get around 23 or 24. I have a ganz, borla header & catback, and magnecor wires.

Check the oil, tranny fluid, and take out those champion plugs. Most would agree NGK's are the way to go. Don't go for platniums like Bosch. Platinum is for longevity, not performance.
Jademonkey is offline   Reply With Quote
Old 04-16-2002, 12:43 PM   #5
Reciprocity
Scooby Specialist
 
Member#: 1165
Join Date: Mar 2000
Chapter/Region: BAIC
Location: Alameda, CA
Vehicle:
2012 dcrawford died
for your sins

Default

Sounds like reactions to a bad tank of gas...

Has this been happening within one tank, or have you re-filled?

NC
Reciprocity is offline   Reply With Quote
Old 04-16-2002, 03:40 PM   #6
artulo
Scooby Newbie
 
Member#: 13243
Join Date: Dec 2001
Chapter/Region: MWSOC
Location: underneath the dash
Vehicle:
2010 Legacy
metallic grey

Default

Most of the idling and starting problems have cropped up with this last tank of gas I put in last week. I usually put in the 89 or 93 octane stuff, but I guess I really don't need to.

So, it may be a bad tank of gas for those problems. However, I'm guessing it really is time for a tune-up and I'd really like to get rid of those champion plugs and put some NGK's and good wires on.

The oil was just changed 1k miles ago.

I'll probably do everything at the same time, since I'm doing the Ganzflo CAI mod soon.

Thanks everyone for your help!
artulo is offline   Reply With Quote
Old 04-16-2002, 04:15 PM   #7
Kevin Thomas
Street Racing Instructor
Moderator
 
Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

Thumbs up Testing

Just run your current tank empty and see what happens with the next 1-2 tank fulls. If the problem persists, change your spark plugs (NGK's recommended by me ). Don't be concerned with your spark plug wires. They should be excellent for a long time to come.

If the problem persists.....let us know. It could get nasty. I doubt it will though.
Kevin Thomas is offline   Reply With Quote
Old 04-16-2002, 04:29 PM   #8
phucvtec
Scooby Newbie
 
Member#: 16261
Join Date: Mar 2002
Location: Buffalo, NY
Vehicle:
2000 Impreza 2.5RS
Blue Ridge Pearl

Default

Just an FYI... I have experienced the same exact problem with my 2000 RS. I replaced the plugs with NGK irridium and replaced the wires with another stock set. The sort of symptoms you describe come and go for me. As hard as I have tried, and trust me, I have tried , I cannot corilate these symptoms with anything. The only thing I have noticed on a consistant basis is that my vehicle has a lot less power (curtacy of said butt dyno ) when it is very humid outside, like after a warm rain. Fortunately, we raraely have more than a warm snow here in buffalo...
phucvtec is offline   Reply With Quote
Old 04-16-2002, 07:01 PM   #9
goobie
Scooby Specialist
 
Member#: 8273
Join Date: Jul 2001
Location: White Rock BC, Canada
Vehicle:
2006 WRX Wagon
WRB

Default same problem

I had my car at the dealer yesterday about an ongoing clutch issue. My car was also bogging of the start and seemed to lack power. My tech tested the coil pack and it was weak. He ordered a new coil pack which will be installed on the 24th of april. I'll let you know how it turns out.
Chad
goobie is offline   Reply With Quote
Old 04-16-2002, 07:36 PM   #10
Jademonkey
Scooby Specialist
 
Member#: 9213
Join Date: Aug 2001
Location: My grandma was 6' 6"
Vehicle:
2000 RS
Red

Default

Quote:
Originally posted by artulo
Most of the idling and starting problems have cropped up with this last tank of gas I put in last week. I usually put in the 89 or 93 octane stuff, but I guess I really don't need to.

!!! 93 octane? That's way to high my friend. Go back down to 87. Unless you have a highly modded engine, then go to 89....but otherwise, I'd switch to 87.


Good luck!
Jademonkey is offline   Reply With Quote
Old 04-16-2002, 07:43 PM   #11
KillerTHC
Scooby Specialist
 
Member#: 4942
Join Date: Mar 2001
Chapter/Region: BAIC
Location: Palo Alto, CA USA
Vehicle:
01 SRP 2.5 RS-T
Ludespeed Stage 3 Link'd

Default

is it possible to use gas that is too good?
KillerTHC is offline   Reply With Quote
Old 04-16-2002, 08:41 PM   #12
Blindeye_03
Scooby Guru
 
Member#: 4418
Join Date: Feb 2001
Chapter/Region: South East
Location: Woodstock, Georgia
Vehicle:
2004 TSX
Blue

Default

Quote:
Originally posted by Jademonkey


!!! 93 octane? That's way to high my friend. Go back down to 87. Unless you have a highly modded engine, then go to 89....but otherwise, I'd switch to 87.


Good luck!
Dunno about you, but when it gets hot outside (like summer weather), my car pings with 87...thats why I switched to 89...but the only mods (performance wise) are an intake, catback exhaust and an UDP.

But thats just me...

-justin
Blindeye_03 is offline   Reply With Quote
Old 04-17-2002, 01:21 AM   #13
Jademonkey
Scooby Specialist
 
Member#: 9213
Join Date: Aug 2001
Location: My grandma was 6' 6"
Vehicle:
2000 RS
Red

Default

Quote:
Originally posted by KillerTHC
is it possible to use gas that is too good?
It is possible to use gas with an ocane rating too high. High octane doesn't necessarily mean better gas. If the octane is too high, not all of it burns, and hence you lose some power, and your mileage goes down. Our EJ25's are designed to run off of 87 octane. 89 would be OK if you're getting some pinging, but if you have to use 91+, something's wrong with your engine. Well, that's what I was told when i was having a chat with one of the grease monkeys where I bought my RS.

I live pretty much at sea level...i rarely get pinging with my mods. Once in a while though, but not often. So it also depends on your weather and altitude.
Jademonkey is offline   Reply With Quote
Old 04-17-2002, 08:51 AM   #14
artulo
Scooby Newbie
 
Member#: 13243
Join Date: Dec 2001
Chapter/Region: MWSOC
Location: underneath the dash
Vehicle:
2010 Legacy
metallic grey

Default

Quote:
Originally posted by Jademonkey


!!! 93 octane? That's way to high my friend. Go back down to 87. Unless you have a highly modded engine, then go to 89....but otherwise, I'd switch to 87.


Good luck!
Sounds like a good Idea! I'll run the tank dry this weekend and fill up with the regular 87 and see how that goes.

I'm still gonna do the plugs and CAI though...
artulo is offline   Reply With Quote
Old 04-17-2002, 10:35 AM   #15
Jademonkey
Scooby Specialist
 
Member#: 9213
Join Date: Aug 2001
Location: My grandma was 6' 6"
Vehicle:
2000 RS
Red

Default

Quote:
Originally posted by artulo


Sounds like a good Idea! I'll run the tank dry this weekend and fill up with the regular 87 and see how that goes.

I'm still gonna do the plugs and CAI though...
Good luck Let us know what happens. You'll have to go through a tank or two until you notice a difference. Get those plugs out of there too. I wouldn't put champions in my lawn mower!
Jademonkey 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
performance issues carguy_25 Factory 2.0L Turbo Powertrain 10 04-19-2007 02:22 PM
Any performance issue with swapping a STi scoop for WRX? jsavage Interior & Exterior Modification 27 08-15-2005 07:38 AM
3.0 performance issue Raoul Outback Forum 0 10-23-2004 01:33 PM
Performance issue wik an '04 WRX Vipre Factory 2.0L Turbo Powertrain 16 12-11-2003 09:35 PM
ECU Reset & Performance Issues chuglobal Factory 2.0L Turbo Powertrain 34 04-08-2002 07:15 PM


All times are GMT -4. The time now is 09:49 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.