Welcome to the North American Subaru Impreza Owners Club Saturday August 23, 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 06-27-2010, 05:20 PM   #1
rinna chan
Scooby Newbie
 
Member#: 195927
Join Date: Nov 2008
Have a Nice Day? 99 Legacy L 2.2 boging and hesitation

So here is my story. I bought a 1999 Legacy L 2.2 Auto (160k miles) with a bad transmission and have been fixing it up. I replaced the trans and that works beautifully. Unfortunately that is not the case for the engine.

These are my current symptoms. The car idles a bit low but fine overall. When you go to hit the gas (in park) it bogs down. It will eventually rev ok in park but will not rev over 4000rpm. Once you go to drive it it bogs down again, but if you hold the throttle just so it will go, if you give it more gas it bogs again.

I tried unplugging the MAF but it immediately dies and it idles OK, so I'm thinking that it's fine. I'm not getting a code for the knock sensor either, tried unplugging it and it ran a lot worse.

I've had several check engine lights for IAC. It's on again but I haven't gone out to check what it is.

I know that the car had been sitting for about a year, maybe two.

Things that I've tried:
new plugs.
new O2 sensor
coil (tried swapping with an outback and it ran the same)
new (used) TPS.
New (used) IAC.
Checked for a clogged cat (still did it with the cat off)
Added a ground to behind the coil, the drivers strut tower, and to the drivers headlight location. Replaced the power and ground battery cables and cleaned most of the other ones I could find.
Changed the fuel filter (old one was dripping out black chunks)
Put a bottle of chevron in but haven't driven it enough to run it through.
Ran half a bottle of sea foam through the intake.
CTS reads ok
Transmission selector tested ok.


Things that I'm considering:

clogged fuel injectors (how to test?)
clogged or weak fuel pump or relay (starts every time though)
Some weak sensor going out, O2, MAF (not getting codes for those)
plug wires ? But it revs fine at certain times so I'm guessing no.
I took the wires out and cleaned them so I don't think they're shorting out.

I've been searching the forums for weeks trying to figure this out so If anyone has anything to offer besides throwing parts at it I would be most appreciative!
* Registered users of the site do not see these ads.

Last edited by rinna chan; 07-07-2010 at 08:41 PM.
rinna chan is offline   Reply With Quote
Old 06-27-2010, 06:38 PM   #2
Jessekrs123
Scooby Specialist
 
Member#: 236927
Join Date: Jan 2010
Chapter/Region: NESIC
Location: Oakville CT
Vehicle:
1993 Legacy Sedan
1984 BRAT

Default

Could be the crank or cam position sensor, if you replaced all of the other ignition components. I do not believe the IACV would be the problem if it only happens when you rev it up because the IACV operates the idle. The crank and cam sensors tell the engine when to fire, so they could be burnt out and sometimes not send a signal. This happened to me and when I replaced the crank position sensor it fixed this problem.
Jessekrs123 is offline   Reply With Quote
Old 06-27-2010, 08:53 PM   #3
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

Have you cleaned the MAF? Reset the ECU? Check those codes, could be a new signature. Try unplugging the front O2 sensor and see if it runs differently.
yarrgh is online now   Reply With Quote
Old 06-27-2010, 09:40 PM   #4
rinna chan
Scooby Newbie
 
Member#: 195927
Join Date: Nov 2008
Default

sprayed the heck out of MAF through the metal screen on the front. Probably didn't do much but the senor itself has those torx security bits with the nub in the middle, which I consequently do not have yet. I have reset the ECU. Unplugged the front O2 sensor and it ran slightly worse. I do need to venture out to get the codes scanned again. Hopefully something useful will come up.
rinna chan is offline   Reply With Quote
Old 06-27-2010, 11:56 PM   #5
SubyRS03
Scooby Newbie
 
Member#: 245297
Join Date: Apr 2010
Chapter/Region: South East
Location: Greer,SC
Vehicle:
2004 WRX vf48 93 oct
WRB

Default

had the same problem on my 03 rs the more i pressed down on the gas the more it bogged i replaced the bad fuel pump n filter but since you have replaced the filter may just be the pump or something else just throwing my experiences with those symptoms hope it helps

Last edited by SubyRS03; 06-27-2010 at 11:58 PM. Reason: added more txt
SubyRS03 is offline   Reply With Quote
Old 07-07-2010, 08:40 PM   #6
rinna chan
Scooby Newbie
 
Member#: 195927
Join Date: Nov 2008
Default

It wasn't the O2 sensor either. Just replaced that and it still wont go past a certain throttle position without bogging. Fuel pump goes in tomorrow. CEL went out before I could scan it.
rinna chan is offline   Reply With Quote
Old 07-09-2010, 11:05 PM   #7
thegonz
Scooby Newbie
 
Member#: 180208
Join Date: May 2008
Chapter/Region: Tri-State
Location: new york
Vehicle:
2008 DGM 2.5i sedan
96 leggy wagon ls

Default

i replaced my fuel filter and did that trick for but when its hot out it starts like crap for some reason
thegonz is offline   Reply With Quote
Old 07-10-2010, 05:35 PM   #8
rinna chan
Scooby Newbie
 
Member#: 195927
Join Date: Nov 2008
Default

already tried the fuel filter. I just did the pump and it's not that either. Plug wires and valve cover gaskets are next...
rinna chan is offline   Reply With Quote
Old 07-28-2010, 03:59 PM   #9
rinna chan
Scooby Newbie
 
Member#: 195927
Join Date: Nov 2008
Default

Turned out to be the MAF. No CEL even though the car barely ran.
rinna chan is offline   Reply With Quote
Old 09-02-2010, 09:12 AM   #10
thegonz
Scooby Newbie
 
Member#: 180208
Join Date: May 2008
Chapter/Region: Tri-State
Location: new york
Vehicle:
2008 DGM 2.5i sedan
96 leggy wagon ls

Default

glad you were able to find the problem

what i did to fix my car was i used seafoam and now my car runs like brand new even though it has 138000 miles on it
thegonz 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
WTB : 90 Legacy 2.2 A/C compressor CO S13 Private 'Wanted' Classifieds 4 06-29-2010 02:10 PM
WTB: Idaho - 97-99 Legacy Outback hood, 2.5L engine spdracr00 NWIC Private Classifieds 0 09-15-2009 12:52 PM
Problems with 08 2.5i. ticking and hesitation.. Redneck Ricer Normally Aspirated Powertrain 5 09-19-2008 12:31 PM
WTB: 99 Legacy Exhaust Manifold 2.5 DOHC WagonGGA Private 'Wanted' Classifieds 9 02-28-2008 04:56 AM
97-99 Legacy GT/L Diffy Questions and Brakes Paisan Subaru Conversions 9 03-01-2007 11:46 AM


All times are GMT -4. The time now is 11:54 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.