Welcome to the North American Subaru Impreza Owners Club Monday November 19, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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. 
View Poll Results: Leaky Valve or Poor Rings?
Poor Rings 1 12.50%
Leaky Valv 7 87.50%
Voters: 8. You may not vote on this poll

Reply
 
Thread Tools Display Modes
Old 08-23-2006, 10:54 PM   #1
NITROS
Scooby Specialist
 
Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

Default Leaky Valve or Poor Rings? Video inside

Alright as the title state which one do you guys think it is?

I was using this site as a refernce
http://www.therangerstation.com/Maga...acuumLeaks.htm

Here is the video


Let me give a little more info.

This is an EJ25 with wrx heads, sti head gasket.
Invidia DP
STI uppipe
Perrin Crank Pulley
UTEC

Misfire occur randomly on cylinders. (mostly 2 and 4)

Compression test results:

1 - 165
2 - 180
3 - 175
4 - 175


Any idea's guys?
* Registered users of the site do not see these ads.

Last edited by NITROS; 09-18-2006 at 07:08 PM.
NITROS is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 08-23-2006, 11:27 PM   #2
sonic rx
Scooby Specialist
 
Member#: 33457
Join Date: Feb 2003
Chapter/Region: PRSIC
Location: 430 whp & 400 wtq 22 psi 93oct
Vehicle:
HAHA EVERYONE KNOWS
DYNO JET IS NOT REAL WHP

Default

boxer motor . lumpy idle ,these to will make a guage jump. as for the misfires .... has the car been tuned? compression is increased with the gaskets you are using this will cause misfire problems.. compression looked ok to me was it hot or did ya check cold?
sonic rx is offline   Reply With Quote
Old 08-23-2006, 11:38 PM   #3
NITROS
Scooby Specialist
 
Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

Default

Quote:
Originally Posted by sonic rx
boxer motor . lumpy idle ,these to will make a guage jump. as for the misfires .... has the car been tuned? compression is increased with the gaskets you are using this will cause misfire problems.. compression looked ok to me was it hot or did ya check cold?
The engine was tuned to by me its pretty smoothe the IDLE AFR is messed they jump up and down between 14.2-15.5. Most of the time 14.7 - 15.1.

The vacuum check was done on a hot engine.
the compression check was done on a warm engine.
NITROS is offline   Reply With Quote
Old 08-23-2006, 11:47 PM   #4
Jasper
Scooby Specialist
 
Member#: 80136
Join Date: Jan 2005
Chapter/Region: NESIC
Location: Saugus, MA
Vehicle:
2006 Ford F-150
Black

Default

15.1 ?!


christ you run it lean. please dont tell me its that high above anything but idle?!

what do the plugs look like? are all your timing marks lined up?


(the misfire could very easily be caused by running that lean...makes predetonation VERY easy)
Jasper is offline   Reply With Quote
Old 08-24-2006, 12:02 AM   #5
RP31
Scooby Specialist
 
Member#: 123574
Join Date: Aug 2006
Vehicle:
2005 STi
CGM

Default

Quote:
Originally Posted by JasperSTi
15.1 ?!


christ you run it lean.
It does say idle AFRs.

I run my car 13:1 at redline.
RP31 is offline   Reply With Quote
Old 08-24-2006, 12:59 AM   #6
subalou1
Scooby Specialist
 
Member#: 57966
Join Date: Mar 2004
Chapter/Region: Tri-State
Location: new york
Vehicle:
2002 wrx Sedona Red
[email protected], best trap 131

Default

off topic but is 13:1 at redline lean?
subalou1 is offline   Reply With Quote
Old 08-24-2006, 02:26 AM   #7
NITROS
Scooby Specialist
 
Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

Default

Quote:
Originally Posted by JasperSTi
15.1 ?!


christ you run it lean. please dont tell me its that high above anything but idle?!

what do the plugs look like? are all your timing marks lined up?


(the misfire could very easily be caused by running that lean...makes predetonation VERY easy)

I dont run it liek that. it runs itself like that. the AFR are not stable they jump up and down at idle. i run 11:1 at red line.
NITROS is offline   Reply With Quote
Old 08-24-2006, 03:25 PM   #8
sonic rx
Scooby Specialist
 
Member#: 33457
Join Date: Feb 2003
Chapter/Region: PRSIC
Location: 430 whp & 400 wtq 22 psi 93oct
Vehicle:
HAHA EVERYONE KNOWS
DYNO JET IS NOT REAL WHP

Default

when you use wrx heads with sti block ,and use stock head gaskets . you make more power with less timing ,and less boost. if you are running more timing you are probably causing your misfires that way. i run a similar setup ,but my heads are p&ped and i am running 264 cams with oe head gaskets,and a built (forged internals) 2.5l . timming and your afr would be my concerns. my vacuum moves a little also.
sonic rx is offline   Reply With Quote
Old 08-24-2006, 04:34 PM   #9
AZScoobie
Scooby Guru
 
Member#: 8785
Join Date: Jul 2001
Chapter/Region: SWIC
Vehicle:
02 [email protected]
netcom.com

Default

15.1 is NOT lean for cruise or idle Jasper. This is normal for it to jump around a bit. Lean cruise is 15.4 to 1. This engine looks normal to me. Misfire codes are common. The ECU;s are very sensitive to it.


Clark
AZScoobie is offline   Reply With Quote
Old 08-24-2006, 04:40 PM   #10
Jasper
Scooby Specialist
 
Member#: 80136
Join Date: Jan 2005
Chapter/Region: NESIC
Location: Saugus, MA
Vehicle:
2006 Ford F-150
Black

Default

Quote:
Originally Posted by AZScoobie
15.1 is NOT lean for cruise or idle Jasper. This is normal for it to jump around a bit. Lean cruise is 15.4 to 1. This engine looks normal to me. Misfire codes are common. The ECU;s are very sensitive to it.


Clark

he said up to 15.5:1, which is what bothered me

my idle and cruise is set to 14.7:1, and doesnt stray far from that (+/- .2 maybe via borrowed LM-1)....and for safetys sake i run it 11.2:1 @ redline, and ~ 11.5:1 most anywhere above 5200rpm. for a TD04 powered 2.0, it pulls like a freight train, so im rather happy with it.
Jasper is offline   Reply With Quote
Old 08-24-2006, 05:04 PM   #11
AZScoobie
Scooby Guru
 
Member#: 8785
Join Date: Jul 2001
Chapter/Region: SWIC
Vehicle:
02 [email protected]
netcom.com

Default

Ok Great. But even 15.5 is not real lean.. I was just pointing that out. The idle and cruise AFR can be changed from the factorys 14.7 to 1 in the map. I run most cars around 15.4 to 1 which returns a slight gain in fuel economy according to owners.

Cya

Clark
AZScoobie is offline   Reply With Quote
Old 08-24-2006, 07:13 PM   #12
RP31
Scooby Specialist
 
Member#: 123574
Join Date: Aug 2006
Vehicle:
2005 STi
CGM

Default

<threadjack>
Clark, do you happen to know what the leanest mixture is that the ECU can see before it throws a CEL? I assume it is load site dependent... Do you know anything about this? I'm tuning my car to run on E85 using a UTEC, and I keep getting a CEL for running too lean of a mixture. I am running 12-15:1 depending on load, and I can't figure out why I keep getting the CEL. The only times AFRs go above that are during shifts and while coasting.
</threadjack>
RP31 is offline   Reply With Quote
Old 08-24-2006, 07:31 PM   #13
AZScoobie
Scooby Guru
 
Member#: 8785
Join Date: Jul 2001
Chapter/Region: SWIC
Vehicle:
02 [email protected]
netcom.com

Default

You get the Bank to lean codes when the Fuel trims are out of wack. Get an OBD Scan tool and check your long and short term trims. Adjust the injector scale settings or the 0 column to get the Trims near zero and your problem will go away.

Clark
AZScoobie is offline   Reply With Quote
Old 08-24-2006, 07:34 PM   #14
RP31
Scooby Specialist
 
Member#: 123574
Join Date: Aug 2006
Vehicle:
2005 STi
CGM

Default

Ahhh, okay. Thanks! I will do that.
RP31 is offline   Reply With Quote
Old 08-24-2006, 08:52 PM   #15
NITROS
Scooby Specialist
 
Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

Default

At cruise my AFR are spot on 14.7 - 14.8 its only at idle it feels like it runs really rough. They are also spot on when im WOT.

I do feel the misfires when they occur. Hippy mentioned that it might be the lighthen crank pulley causing the misfires. I bought one off a nasioc member and it got here today.

I have to say that in the subaru manual it said the vacuum should be a steady 17.72 mg in.
NITROS is offline   Reply With Quote
Old 08-25-2006, 01:15 AM   #16
sonic rx
Scooby Specialist
 
Member#: 33457
Join Date: Feb 2003
Chapter/Region: PRSIC
Location: 430 whp & 400 wtq 22 psi 93oct
Vehicle:
HAHA EVERYONE KNOWS
DYNO JET IS NOT REAL WHP

Default

Quote:
Originally Posted by NITROS
At cruise my AFR are spot on 14.7 - 14.8 its only at idle it feels like it runs really rough. They are also spot on when im WOT.

I do feel the misfires when they occur. Hippy mentioned that it might be the lighthen crank pulley causing the misfires. I bought one off a nasioc member and it got here today.

I have to say that in the subaru manual it said the vacuum should be a steady 17.72 mg in.
hippy blames everything on lightend crank pulley even engines blowing up. if tuned for it they will not throw a misfire.lightend flywheel do this sometimes but can also be tuned for to reduce the times it throw mfc.
sonic rx is offline   Reply With Quote
Old 08-25-2006, 11:06 PM   #17
bubba03wrx
Scooby Specialist
 
Member#: 36700
Join Date: May 2003
Chapter/Region: SCIC
Location: boba thread founder
Vehicle:
EVO 9
07 GSXR 750

Default

dont feel like reading rest of thread but from what ive learned at school. A fluctuating vac test like that is most likely a valve train problem. Most likely a messed up valve.

doing a leak down test might help. If you do deicde to do one, do this.

Once the cylinder has pressure in it (make sure the cylinder your testing is at top dead center compression stroke). Listen for a "hissing sound" put your ear on the exhaust, oil cap, intake, radiator. It might be easier to hear these sounds witha stethascope (sp?)

If you hear noise from your exhaust, exhaust valve is messed up.
noise from Intake means intake valve.
noise from oil cap or dipstick means messed up piston rings.
and last and least likely, bubbles in the coolant reservoir or radiator cap means blown head gasket.

hope that helps some

Last edited by bubba03wrx; 08-26-2006 at 09:37 PM.
bubba03wrx is offline   Reply With Quote
Old 08-26-2006, 01:24 PM   #18
ka mano
Scooby Specialist
 
Member#: 78022
Join Date: Dec 2004
Chapter/Region: NWIC
Location: Seattle, Washington 05 WRB GGA
Vehicle:
PdxT built 2.5L 6sp
30R.82, 274/276, H2O+meth

Default

Quote:
Originally Posted by bubba03wrx
... A fluctuating valve like that is most likely a drivetrain problem. Most likely a messed up valve. ...
The pressure-test How To will be helpful to many... but you didn't mean 'drive'train, did you?
ka mano is offline   Reply With Quote
Old 08-26-2006, 09:37 PM   #19
bubba03wrx
Scooby Specialist
 
Member#: 36700
Join Date: May 2003
Chapter/Region: SCIC
Location: boba thread founder
Vehicle:
EVO 9
07 GSXR 750

Default

Quote:
Originally Posted by ka mano
The pressure-test How To will be helpful to many... but you didn't mean 'drive'train, did you?
im sorry i must have been on crack last night when i wrote that. I mean a valve train problem
bubba03wrx is offline   Reply With Quote
Old 08-27-2006, 12:43 AM   #20
Division By Zero
Scooby Specialist
 
Member#: 7555
Join Date: Jun 2001
Chapter/Region: South East
Location: Charlotte NC
Default

Your survey lists: 1.) Leaky Valves or 2.) Poor Rings. You shoud have included a vacuum leak issue. That's what I think it is IMHO. Try spraying starting fluid or similar at the vacuum hoses, intake manifold sealing points, PCV valve, etc. If your idle changes when spraying at the given area then that's you issue.
Division By Zero is offline   Reply With Quote
Old 08-28-2006, 04:14 AM   #21
NITROS
Scooby Specialist
 
Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

Default

I will do a leak down when i come back from arkansas next friday. same for the vacuum. I have installed the stock pulley the car seems to run alot better, i havent experienced (felt) any misfires yet. I need to clear my CODES and we'll see.

Thanks for you help guys.
NITROS 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
Valve Tick/Piston Slap. Video inside, please help! Disco_Inferno Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 18 07-07-2009 11:11 PM
Leaky valve cover gaskets: 1998 2.5 DOHC MaddMax Legacy Forum 5 02-01-2007 12:39 AM
Jumpy vacuum, Leaky Valve? NITROS Built Motor Discussion 0 08-23-2006 11:12 PM
Leak Test - leaky valve guide Joncas Normally Aspirated with bolt-on Forced Induction Powertrain 18 01-18-2005 05:05 AM
Leaky valve covers? wRxbeater11 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 09-11-2004 01:59 PM

All times are GMT -4. The time now is 07:07 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.