Welcome to the North American Subaru Impreza Owners Club Monday July 14, 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 > Pre-2002 Factory Turbo 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 10-04-2009, 05:16 PM   #1
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default Rough idle, intermitent and rough cold starts...

Hey guys, new here...and having some wierd issues with my JDM 94 sube...its got the 2.0L of course...117 xxxkm's

well, its intermitent, one day i came home and it had a bouncy idle and the CEL came on but when driving it drove normal as if there was no issue. I shut it off...bought a case of beer and came out...and it ran fine...

also while running, when it decides to idle normal and smooth you can hear it hicup (for lack of a better work) slightly like its misfiring.

a few weeks later i started it after work and it idled up to 2000 rpm and wouldn't go down, so i limped it home and checked hoses, conections etc. i took the maf out and it appeared to be clean. The sensor conected to the TB i beleive is the throttle possition sensor? i unplugged that and and the idle dropped to almost normal. I should add that turning the A/C on would make it drop as well.

I pulled it off to see if i could clean it...couldn't, it apears to be a sealed unit so i reinstalled it and adjusted itso it'll idle at 1000 rpm at idle. plugged it back in and works fine.

Now that the cold weather is here (around 0 celcius) it is not happy about starting, it'll have a real rough low idle for 5 seconds and then idle up to 1000 and be fine.

Recently i've also noticed when doing a hard pull it'll surge around 5000 rpm...feels like it loses boost but the boost gauge says 13 psi and doesnt move...it maybe a misfire too...

- I plan on doing a tune up (plugs, air filter, possibly coilpacks? anything else?) this weekend but, i know this wont fix my non existant high idle when cold problems...anyone have a clue of whats going on? And is there a way to check what the CEL means on these older cars? thanks
* Registered users of the site do not see these ads.
carter_wrx is offline   Reply With Quote
Old 10-05-2009, 03:42 PM   #2
Cbgrandtheftauto
Scooby Specialist
 
Member#: 184977
Join Date: Jul 2008
Chapter/Region: South East
Location: TN
Vehicle:
99 Impreza RS
'13 BRZ

Default

Mine ran rough when it was cold out...once it warmed up it ran fine...after I tuned it it got a little better...answer this...what ecu are you running and what gas do you usually put in?...has it been tuned???...any mods??
Cbgrandtheftauto is offline   Reply With Quote
Old 10-05-2009, 09:24 PM   #3
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

Quote:
Originally Posted by Cbgrandtheftauto View Post
Mine ran rough when it was cold out...once it warmed up it ran fine...after I tuned it it got a little better...answer this...what ecu are you running and what gas do you usually put in?...has it been tuned???...any mods??

Im not sure exactly which ecu...its a stock 94 JDM with the Ej20... what should i look for?

mine hasnt been tuned, its bone stock other than a boost gauge and boost controller I added a few months ago.

I've ALWAYS ran 91 or 94 when i can, in my town the best fuel here is shells v power 91. It seems to act this way reguardless of the fuel and where i got it from...
carter_wrx is offline   Reply With Quote
Old 10-05-2009, 10:50 PM   #4
Cbgrandtheftauto
Scooby Specialist
 
Member#: 184977
Join Date: Jul 2008
Chapter/Region: South East
Location: TN
Vehicle:
99 Impreza RS
'13 BRZ

Default

so you added a boost controler and guage???...did you turn up the boost??..more than likely you have a stock restrictive DP and turning up the boost past stock will cause the boost not to raise to desired PSI or it will be a eratic boost that wont stay constant..do you have a knock sensor??..I had a simular experience when I turned my boost instead of 1.1 bar I changed it to 2 bar on my stock setup...the car laged, burped, stuttered, and black smoked and caused a CEL..finally I reset the ECU and it quit

Last edited by Cbgrandtheftauto; 10-05-2009 at 10:56 PM.
Cbgrandtheftauto is offline   Reply With Quote
Old 10-06-2009, 01:01 AM   #5
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

i turned the boost up to 12 psi and it is consistant...its never spiked or anything...it also ran fine when i got it and ran fine for a long time after the boost controller and gauge were installed...

right now when its cold and i start it it'll have a low roguh idle and if i try give it some gas to help it warm up it'll almost stall out...

i'll try returning it to stock and see what happens tho so we can rule that out if it doesnt work...
carter_wrx is offline   Reply With Quote
Old 10-06-2009, 02:12 AM   #6
BNR32 DRIFTER
Scooby Newbie
 
Member#: 222655
Join Date: Sep 2009
Chapter/Region: W. Canada
Location: Winnipeg Manitoba Canada
Vehicle:
1994 JDM GC8 WRX

Default

If your car is like mine the idle only studders or jumps when the engine is cold in the morning, but regarding the TPS did you adjust it by the voltage output? That could be the problem and if not than maybee the IACV?
BNR32 DRIFTER is offline   Reply With Quote
Old 10-06-2009, 10:49 AM   #7
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

no, i had it run and adjusted it to where it idled at 1000 rpm so it'd run normal so i could get home (i was about 5 hours away) that was the time it decided to idle at 2000 rpm and bounce to and from 1500. if i unplugged the tps it ran normal...

wheres the IACV located? and can it be serviced or cleaned?

thanks for all the input guys
carter_wrx is offline   Reply With Quote
Old 10-06-2009, 03:34 PM   #8
Marnix
Scooby Specialist
 
Member#: 51480
Join Date: Dec 2003
Chapter/Region: International
Location: The Netherlands
Vehicle:
1984 AM5, 1994 BC4,
2010 BR5

Default

Remove the coil packs and check the condition of the rubber boots, they tend to crack causing all sorts of problems (difficult starting, cutting out under boost etc).
Marnix is offline   Reply With Quote
Old 10-06-2009, 09:25 PM   #9
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

where are the rubber boots located? i'll pull these out this weekend and inspect them...

also where can i get new coilpacks? or am i forced to use the 02+ packs now?
carter_wrx is offline   Reply With Quote
Old 10-07-2009, 12:01 AM   #10
Cbgrandtheftauto
Scooby Specialist
 
Member#: 184977
Join Date: Jul 2008
Chapter/Region: South East
Location: TN
Vehicle:
99 Impreza RS
'13 BRZ

Default

the boots Marnix is refering to are the boots connected to the spark plugs and to the coil pack...you can use a coil pack from a 98 RS...did turning the boost down to stock help any??
Cbgrandtheftauto is offline   Reply With Quote
Old 10-07-2009, 10:33 AM   #11
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

havent had a chance to replace the boost control sol. i've been at my gf's place for the last few days.

you can use the rs25 coilpacks?? are they the same? or is there mods i have to do?
carter_wrx is offline   Reply With Quote
Old 10-07-2009, 12:29 PM   #12
Cbgrandtheftauto
Scooby Specialist
 
Member#: 184977
Join Date: Jul 2008
Chapter/Region: South East
Location: TN
Vehicle:
99 Impreza RS
'13 BRZ

Default

There direct bolt up...but use the 98 rs..99 had like a male end on it
Cbgrandtheftauto is offline   Reply With Quote
Old 10-07-2009, 02:19 PM   #13
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

alright i'll probably just order those...on a jdm car 117 xxx km's im almost possitive mine are cracked... im surprised the 98rs coilpacks fit the JDM motor because i've been told in the past my only option was the 02+ packs and re wiring them
carter_wrx is offline   Reply With Quote
Old 10-07-2009, 02:42 PM   #14
Cbgrandtheftauto
Scooby Specialist
 
Member#: 184977
Join Date: Jul 2008
Chapter/Region: South East
Location: TN
Vehicle:
99 Impreza RS
'13 BRZ

Default

After re-reading your first post I thought you had a 20k...you have cop don't you??
Cbgrandtheftauto is offline   Reply With Quote
Old 10-07-2009, 02:45 PM   #15
Marnix
Scooby Specialist
 
Member#: 51480
Join Date: Dec 2003
Chapter/Region: International
Location: The Netherlands
Vehicle:
1984 AM5, 1994 BC4,
2010 BR5

Default

The ones you need were not available in the US, the part number is 22433AA330 and dealers in Europe charge 75 Euro each. I think you can get them through Japanparts.com.

That said, I don't know if changing the coil packs will fix your problem!
Marnix is offline   Reply With Quote
Old 10-08-2009, 01:37 AM   #16
Speed Stick
Scooby Newbie
 
Member#: 202852
Join Date: Feb 2009
Chapter/Region: W. Canada
Location: Red Deer, Alberta Canada
Vehicle:
1993 JDM GC8 Sedan
Graphite Gray Pearl 1C6

Default

The reason for that 5000rpm is most likely the coils. Mine were bad in mine when i first got it. They were cracked. I converted it to work with 04sti coils and it works flawlessly now. I would just get 02+ coils. I'm pretty sure the 98rs coils don't work because only the turbo engines had the actually coils rather then coilpacks like the NA model. And if you want you can go to Subaru with the coil part number and order them, I know they can get them in. I know someone who has ordered them here in Canada and got them.

Your idle issue may have been caused from you IACV. I know mine went high a couple times and immedietly after a cel came on and it was a iacv code. Only happened twice.

Every Ej20g starts ****ty in the cold, not exactly sure what causes it but I know some guys cleaned there IACV out and it fixed the problem while others made it worse. Another guy bought a whole brand new unit and it still starts crappy which is odd.
Speed Stick is offline   Reply With Quote
Old 10-09-2009, 02:11 AM   #17
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

Quote:
Originally Posted by Speed Stick View Post
The reason for that 5000rpm is most likely the coils. Mine were bad in mine when i first got it. They were cracked. I converted it to work with 04sti coils and it works flawlessly now. I would just get 02+ coils. I'm pretty sure the 98rs coils don't work because only the turbo engines had the actually coils rather then coilpacks like the NA model. And if you want you can go to Subaru with the coil part number and order them, I know they can get them in. I know someone who has ordered them here in Canada and got them.

Your idle issue may have been caused from you IACV. I know mine went high a couple times and immedietly after a cel came on and it was a iacv code. Only happened twice.

Every Ej20g starts ****ty in the cold, not exactly sure what causes it but I know some guys cleaned there IACV out and it fixed the problem while others made it worse. Another guy bought a whole brand new unit and it still starts crappy which is odd.

Hmm...i'll pull mine out and have a look at the coils...still havent gotten time to do that yet.

also just to verify...the IACV...wheres it located? thanks!

also it kinda sucks that the 20g starts ****ty in the cold as i bought this for my winter car mostly haha...oh well live and learn, thanks for the help guys
carter_wrx is offline   Reply With Quote
Old 10-09-2009, 04:29 PM   #18
linsavy
Scooby Specialist
 
Member#: 11620
Join Date: Oct 2001
Location: Ontario
Vehicle:
1997 GF4-STiV3 clone

Default

I suffered with poor cold starts for a long time on my V3. Hot starts would be OK sometimes and some times not. Turns out that I had leaking injectors that flooded the cylinders over-night. New injectors have fixed the start up and smoothed out the engine.

You might want to pull your injectors and send them out to Deatschwerks or RC for cleaning and a nice performance report.
linsavy is offline   Reply With Quote
Old 10-09-2009, 09:51 PM   #19
Speed Stick
Scooby Newbie
 
Member#: 202852
Join Date: Feb 2009
Chapter/Region: W. Canada
Location: Red Deer, Alberta Canada
Vehicle:
1993 JDM GC8 Sedan
Graphite Gray Pearl 1C6

Default

I've heard it to be injectors too. I hope I don't have to replace or rebuild mine because I would be out of a car for a while.

This is where the iacv is.



EDIT: What kind of turnaround time does DeatschWerks Injector Services have?

Last edited by Speed Stick; 10-09-2009 at 11:02 PM.
Speed Stick is offline   Reply With Quote
Old 10-20-2009, 03:01 AM   #20
carter_wrx
Scooby Newbie
 
Member#: 225745
Join Date: Oct 2009
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX wagon
WRB

Default

thanks for the help guys, im thinking injectors as well...its only after i let it sit over night really... its warmed up a little but the starts have been great lately...no idea why lol
carter_wrx is offline   Reply With Quote
Old 10-20-2009, 12:29 PM   #21
rockcrete
Scooby Newbie
 
Member#: 196721
Join Date: Dec 2008
Chapter/Region: VIC
Location: Maple Ridge
Vehicle:
1993 GF8 WRX Wagon
Black

Default

Coilpacks will give you a crappy start when it's misfiring on a cylinder or two and run a bit better when it's warmed up.

The IACV can also give you trouble and is quite easy to clean - it's basic maintenance, everybody should do it.
rockcrete is offline   Reply With Quote
Old 10-20-2009, 02:32 PM   #22
sniper512
Scooby Newbie
 
Member#: 189923
Join Date: Sep 2008
Chapter/Region: W. Canada
Location: Cranbrook, BC
Vehicle:
1993 JDM WRX
Black

Default

Is the starting issues you needing to keep turning the car over before it fires or is it a normal start but rough like misfires?

If its having to keep turning the car over its the injectors for sure. I have seen this issue on 2 different cars now. Replaced the injectors and it was gone. If its just a rough idle clean a IACV if you like, but it seems normal on most EJ20Gs.
sniper512 is offline   Reply With Quote
Old 10-21-2009, 06:42 PM   #23
MonikAWD
Scooby Newbie
 
Member#: 201488
Join Date: Jan 2009
Chapter/Region: South East
Location: Tampa, FL
Vehicle:
99 JDM V5 RA
STM

Default

I have the V5 RA Motor, mine if left overnight it takes me like 10 times before the car finally turns over, i cant figure my issue out either. When it starts it runs like crap, low idle but if you give it gas it kills the engine, after it warms up, runs fine, but intermittenly runs like a vaccum leak at idle when warm..
MonikAWD is offline   Reply With Quote
Old 10-21-2009, 06:53 PM   #24
rs182
Scooby Newbie
 
Member#: 197511
Join Date: Dec 2008
Chapter/Region: SWIC
Location: Las Cruces, NM
Vehicle:
1999 2.5RS
Black

Default

Quote:
Originally Posted by Cbgrandtheftauto View Post
There direct bolt up...but use the 98 rs..99 had like a male end on it
wow I had no idea the 98 rs coil pack would work on a 20K. That is good to know!


My '97 20g (20k look alike) fires off first try when its cold but idles like **** for about 5 seconds then idles right up and knocks until it get warm lol

ps its funny how you cant say shi* on here

Last edited by rs182; 10-21-2009 at 07:48 PM.
rs182 is offline   Reply With Quote
Old 10-21-2009, 07:02 PM   #25
Speed Stick
Scooby Newbie
 
Member#: 202852
Join Date: Feb 2009
Chapter/Region: W. Canada
Location: Red Deer, Alberta Canada
Vehicle:
1993 JDM GC8 Sedan
Graphite Gray Pearl 1C6

Default

I would just order the correct ignition coils anyways. Just read the part number off of it and get your local Subaru dealership to order it in for you. That way you know you won have any issues.
Speed Stick 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
Getting on throttle from idle as well as cold start, causes AFR swings pwrx Factory 2.0L Turbo Powertrain 14 12-17-2009 02:04 AM
Rough Idle, Stalls, P0011, and Noise on cold start Maddroxx Factory 2.5L Turbo Powertrain 27 12-16-2009 04:04 PM
Rough Idle Troubleshooting, and is this correct vacuum? uuarx Factory 2.0L Turbo Powertrain 6 10-28-2009 08:37 AM
Rough cold starts and idle problems WorldRallyRedneck Service & Maintenance 6 03-25-2008 05:55 AM
Rough to no idle idle at cold starts?? Please help! Clzay Factory 2.0L Turbo Powertrain 11 02-11-2007 12:33 AM


All times are GMT -4. The time now is 10:31 AM.


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.