»  BC-BF Legacy Discussion »  Engine
#Need quick help!!!!!

Custom Search
Login | Register




Post new topic Reply to topic  [ 29 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Need quick help!!!!!
PostPosted: Sat Jun 04, 2011 2:42 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
Saw that one of the wires on the IACV was broke open and exposed copper showing. Took the top part of the valve off the magnet part I guess. Spliced a new connector put it all back together in the same spot and not it idles at like 2100 rpm.

I let it idle for like 5-10 mins to see if it would readjust but nothing just idles super high.. Anyone know what I should do? I have a spare computer should I try changing them? It's a turbo model incase that helps

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Sat Jun 04, 2011 4:34 am 
Fifth Gear
Joined: Tue Jan 25, 2005 9:14 pm
Posts: 3043
Location: Twin Cities, MN
Coolant temp sensor is a common failure point to cause that. Also, if you have the IAC vale off clean it with something. A brake or carb cleaner made from petroleum distillates is a good start.

_________________
→Dan

piddster34 at h0tma1l d0t c0m


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Sat Jun 04, 2011 5:17 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
Put the car in reverse to maybe try and drive it around to figure it out or the computer might relearn and the check engine light comes on, Code 24 IACV. Now when that happens is it just the little top part that shorts out or is the whole thing fubar?

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Sat Jun 04, 2011 6:21 am 
First Gear
Joined: Sun Apr 03, 2011 7:44 am
Posts: 62
Location: Durango, CO
try reversing the wires and see if that makes a difference

_________________
- 94 Touring Wagon, Quicksilver Metallic 95k miles


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Sat Jun 04, 2011 6:37 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
all the wires are good test light confirms it. Ill try replacing the top part of the unit. Just a shitty design by subaru. CEL comes on at a stop but goes away while driving, still idles really high though. Super frustrating everytime i fix something on this car another thing breaks.

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Sat Jun 04, 2011 8:05 pm 
Second Gear
Joined: Tue Jul 06, 2010 7:47 am
Posts: 417
Location: Spokane, WA
Did you mark where it sat before you took it off? I had to turn mine a hair to adjust it cuz i forgot to mark it before i took it off.

_________________
93 Black Legacy SS
93 Legacy L sedan
93 Legacy Wagon
95 Impreza coupe- EJ22t swap, 02 Forester 5mt, 01 RS LSD rear diff, TD05, Robtune-550
98 RHD Legacy-Current build-EJ22E/96EJ25D, TD05, Robtune-550, 5spd swap
97 Outback-Wife's car, 5 spd swap


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Mon Jun 06, 2011 2:54 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
i didnt have to mark it cause the spots where the screws have been like sunburned onto the metal so i know its basically in the correct spot. can i adjust that thing while the cars running?

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Mon Jun 06, 2011 3:15 am 
Fifth Gear
Joined: Sun Nov 23, 2003 12:22 am
Posts: 2774
Location: Western WA!
2100 rpm is about where it is with the IAC valve wide open. If it's mounted in the same location as when you took it off, I would say it's your wiring at the connector. Or maybe the valve is dirty and stuck open?

_________________
90 L+ wgn


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Mon Jun 06, 2011 3:22 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
the valve might be dirty but i did just clean it a week ago, not very well cause i was pressed for time.. sucks. Ill recheck the wiring, how would you recommend slicing those wires together.

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Mon Jun 06, 2011 6:46 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27123
Location: Houston, Tx
Check the resistance of each side of the IAC coil. Here's the snippet from the FSM.

http://www.main.experiencetherave.com/s ... C_Diag.zip

If the wiring from the connector at the IAC to the ECU is good, then it's likely the coil.

Also, have you tried resetting the ECU?

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Mon Jun 06, 2011 9:48 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
http://i630.photobucket.com/albums/uu27/lucas_ej22t/IMG_0529.jpg


The one on the right is the stock one, note part number. The one on the left is one from a 92 N/A. Both are identical other than part number.

I have changed the computer, reset it, and sprinkled holy water. Im gonna try and recrimp the wires using heat shrink type butt splicers, in conjunction with heat shrink stuff. If this doesnt work im gonna drive off a cliff in it.

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 12:28 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
ok recrimped everything really good, all tight and secure. Still idles anywhere from 1500-2800, and no matter how i adjust the IACV its always the same except for the very extremes of the adjustment ( higher idle with CEL code 24 ). So im stumped... can i just pour sea foam down the hole on the side of the valve body? Could the coolant temp sensor be bad and not show a code?

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 5:15 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27123
Location: Houston, Tx
How did the car idle before you fixed the wire?

Did you trace back all the wiring from the ECU to the connector? What is the resistance on each coil of the IAC top?

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 5:40 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
car ran fine before. Took it into PIA this morning and they told me since its not throwing a code that its probably just a gummed up valve and that i should get some GM Upper engine and Fuel injector cleaner, and pour/spray it in there and let it clean the gunk out.

What im wondering; is it possible to take the IACV off with out taking the intake manifold off. keep in mind i have changed the turbo to a TD04 so might be to tight?

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 6:12 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27123
Location: Houston, Tx
Do you have a screw on top of the throttle body that looks like this?

http://www.main.experiencetherave.com/subaru/images/TB/

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 6:23 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
Yes I do looks very similar to that. What do u suggest

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 7:12 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27123
Location: Houston, Tx
Screw it all the way down or at least until the idle comes back down to normal.

I ran into a similar idle issue several years back. Had a high idle, and could not figure out why. I checked everything, and all was good. Turned out I cleaned the throttle body, which had a black layer of sealant around it to only allow a certain amount of air to bypass the throttle plate. When I cleaned it, more air bypassed the throttle plate and caused a high idle. I finally found the screw on the TB after removing the bracket for the engine cover....it covers that screw perfectly. The needle valve chokes off the amount of air bypassing the throttle. Some of the throttle bodies do not have the screw....so I'm not sure why it's there.

Chances are that you may have had that one connector wire bad for a while, and maybe the previous owner tweaked the idle with that screw. In theory you should be able to screw that needle valve screw on the TB all the way in so the IAC valve completely handles the idle. What I did was use the select monitor and adjust the screw so that the duty % on the IAC valve was within factory specs.

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 8:40 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
Ill give that a shot thanks for the help above all. However I did finally get ahold of a multimeter and checked all the wires and so far two of the three are ok. Now either the the wire which is white with little red spots goes somewhere else or I just can't find it on the harness by the washer bottle. Also checked ohms on the sensor and it's within specs like the book says

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Tue Jun 07, 2011 9:06 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
^unfortunately my throttle body doesnt have the idle screw your talking about. super bummer. The whole thing just has me stumped.... I might have a bad wire but theres no check engine light.... but the check engine light comes on if i turn of the AC/DEF and let it sit for a minute.. so idk its really frustrating and i would like to kick the designer of the IACV right in the dick.

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Wed Jun 08, 2011 3:17 am 
Second Gear
Joined: Tue Jul 06, 2010 7:47 am
Posts: 417
Location: Spokane, WA
Did you do anything to the tps while messing with the iacv? Also, did you double check the hose from the iacv to the intake pipe isn't clogged or something? Just some ideas i had trying to figure out why the iacv would go crazy for no apparent reason.

_________________
93 Black Legacy SS
93 Legacy L sedan
93 Legacy Wagon
95 Impreza coupe- EJ22t swap, 02 Forester 5mt, 01 RS LSD rear diff, TD05, Robtune-550
98 RHD Legacy-Current build-EJ22E/96EJ25D, TD05, Robtune-550, 5spd swap
97 Outback-Wife's car, 5 spd swap


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Wed Jun 08, 2011 3:23 am 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
never messed with the Tps and those hoses are such a pain in the ass to get to under the intercooler ill have to tear into it to check that, doesnt over heat though so id say those are fine. Probably and electrical problem or something small and stupid.

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Wed Jun 08, 2011 5:41 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27123
Location: Houston, Tx
I would suspect you still have a wiring issue.

The middle wire at the connector should have 12v to it when the ignition is "ON". The other two leads go back to the ECU to control the idle.

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Wed Jun 08, 2011 7:34 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
Like i said two i got to ring but i didnt check that one with the key on :( . But still if its a bad wire why isnt the CEL coming on?

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Thu Jun 09, 2011 5:52 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27123
Location: Houston, Tx
The OBD1 ECU's are sometimes not great on detecting faults. The OBD2 ECU's have more logic in them to detect faults.

It's just a good idea to check all the wiring and make sure you're getting the voltage/resistance readings you expect.

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: Need quick help!!!!!
PostPosted: Thu Jun 09, 2011 8:26 pm 
Third Gear
Joined: Tue Nov 27, 2007 2:43 am
Posts: 736
Location: tacoma washington
ya ill have to bum the multi meter from my friend again. This is by far the most frustrating car problem ive ever had. I feel like taking a sledge hammer to the IACV to teach it a lesson lol

_________________
1993 legacy ss "Shela"


Profile  Offline
Reply with quote  

Display posts from previous:  Sort by  

Post new topic Reply to topic  [ 29 posts ]  Go to page 1, 2  Next


Who is online

Users browsing this forum: No registered users and 2 guests

Panel

Top You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
Search for:
Jump to:  

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Dizayn Ercan Koc