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View Full Version : How To: Outlander Intake Manifold Swap



Prophet
12-04-2009, 09:48 AM
Note: original author is underated4g64
Note: Galant Forums.com Refrence: Click Here (http://www.dnaelite.com/gf/phpbb/viewtopic.php?f=91&t=7557)

Mitsubishi Outlander Intake Manifold Swap for the 99-03 Galant

Why:
The OEM 99-03 galant de/es 4cyl intake manifolds are known to crack due to wear and vibration which causes vacuum leaks and for those with turbo, boost leaks. The leaks cause driving issues like poor gas mileage, stalling and increased emissions.

Tools:
Assorted sockets and wrenches (basic sizes) 7mm, 8mm, 10mm, 12mm, 14mm
Extensions for 3/8th and ¼
Swivel sockets if possible make the bolts under the manifold easier
Sealant (for reinstalling the water neck)
Blade
Carb and choke cleaner or brake cleaner
Sewing needle
Screwdriver (Philips)
18 gauge wire (color is up to you)
Non insulated butt connectors or solder
Shrink tubing
Gasket sealant

Parts:
Try to get the complete assembly but if you have to piece them together you will need

From Outlander:
Manifold
Throttle body
Manifold support
Throttle position sensor (galant sensor will not work) (MD628074)

From Galant:
Oil dipstick tube and gauge
Reuse all other sensors other then the throttle position sensor

You can use either the galant or the outlander:
Injectors *NOTE* This information maybe wrong. You might only be able to use the Galant infectors: Click Here (https://www.thegalantcenter.org/showthread.php?p=677145#post677145)
Fuel rail
Fuel pressure regulator

New:
Intake manifold gasket (MD420945)

Disassembly:
Relieve fuel pressure by removing the fuel pump relay (located in the fuse box under the hood)turn the car on and let it run till it stops by itself, be sure to replace relay when done

Drain coolant (I can’t stress this enough if you don’t you WILL have a floor full of coolant) even though you don’t touch the radiator the throttle body does have coolant running through it and you will need to pull the lower radiator hose and water neck off later to access bolts on the manifold

Remove the hood (trust me it helps) (4) 12mm bolts Remove the battery from the car (frees up space to work)

Remove the whole intake piping from the throttle body and place it aside, use the socket that is right for your piping.

Unbolt throttle position sensor, absolute manifold pressure sensor, ignition failure sensor unplug EGR connectors, and unbolt the grounding cable. Unclip the fuel injector connectors. (Be sure to replace the bolts after you remove the sensors so you don’t loose them)

Disconnect throttle cable from the throttle body by removing the (2) bolts on the valve cover and the (2) on the throttle adjustment plate to give some slack. Push the throttle lever down like your opening it and push the cable through and to the side to free it from the lever. You might have to remove the throttle body to get enough slack if so, disconnect the (2) vacuum lines on top of the TB, then unclamp the feed and return coolant lines from the
TB, then remove the (4) bolts holding it to the manifold they are 12mm bolts.

Remove hoses connecting to the manifold; remove the vacuum hose coming from the brake booster.

Once you have the cable off you can jack up the car (BE SURE TO USE JACKSTANDS ON BOTH SIDES OF THE CAR) it would be best to raise it pretty high because its tight space under there. Remove the exhaust piping if you need to my arms are pretty long and I was able to get around in there without removing the exhaust piping.

Once under the car you will see a rectangular bracket (manifold support bracket) it is held on by (4) bolts all 14mm remove them and remove the bracket. There is a wire loom connected to the bracket, unclip that also. Once you removed the bracket there are (4) 12mm bolts that you will be able to access
remove those

Now back on top of the car start on the passenger side there is one 12mm bolt on the far corner, 3 12mm nuts across the top of the manifold flange, and (3) 12mm bolts in a triangle configuration that hold on the water neck on the driver side of the car 2 you can see 1 you cant you have to feel underneath for it.

Now unbolt the fuel feed line from the fuel rail, and disconnect the return line form the fuel pressure regulator. (Have a rag handy to catch excess fuel left over after the depressurizing step earlier) if you didn’t do that step you will have a lot of fuel coming out now

Unclip the connecter from the coolant temp sensor on the Water neck. Unclip the clamp on the lower radiator hose that connects to the water neck also. Now pull the water neck while making rotating motions and it will come off. (Be careful with the o-ring still on the water pipe) cleanout the sealant in the little groove of the neck, place the water neck aside for now

The manifold should move a little by now. DOUBLE CHECK ALL HOSES, CONNECTORS, WIRES, SENSORS ARE FREE FROM THE MANIFOLD BEFORE PROCEEDING

CAREFULLY REMOVE THE MANIFOLD FROM THE HEAD, BE CAREFUL NOT THE DAMAGE THE THREADS ON THE 3 STUDS BY SLIDING THE MANIFOLD OFF.

Wiring:
Locate the throttle position connector. Cut the 3 wires about and inch or 2 away from the connector to give you enough wire to work with. Add about 3-4 inches of wire between the 2 sections because the outlander sensor is on the firewall side of the manifold now.

Next locate the 2 clips for the EGR connections (black and brownish-red clips) 2 wires each. These to will have to be made substantially longer because the clips are now on the passenger side instead of on the drivers’ side. So add about 5-6 inches to the 4 wires.

Locate the throttle position sensor again and notice the color and location of the wires in the connecter. If you place the 2 sensors face up (part that connects to throttle body) the galant sensor will have 2 pins on the left then a space then one pin (--x-), the outlander will have 1 pin n the left then a space and 2 on the right (-x--). So now that you notice the difference you will have to remove the wire from the connecter using the sewing needle and rearrange them. The black wire goes to the single pin, the brown/white wire goes on the middle pin and the green/white goes to the other outside pin then reconnect the clip to the sensor.

Wiring all done, not too bad right

Reassembly:
This is pretty easy if you took my advice about putting the bolts back in there place if you are going to use the outlander fuel rail and injectors then you don’t have much to do, if you are going use your stock components then now is the time to switch them over

Next put the new intake manifold gasket back on the head

Reinstall the manifold

Hold the manifold while you secure the manifold with the old bolts and nuts (finger tight)

Connect the EGR clips to there sensors they are color coded and they only go on one way so it’s pretty easy. Bolt up the TPS to the manifold.

Reconnect the fuel injector clips

Hook up the FPR to the small vacuum port on the left side of the new manifold

Reconnect the brake booster vacuum line to the manifold

Bolt the ground cable back up to the manifold

Reconnect the coolant hoses to the throttle body

Reconnect the throttle cable to the TB

Get back under the car and reinstall the manifold bracket (4) 14mm bolts

Now you can fill the groove inside the water neck with a gasket making sealant and reinstall it with the (3) 12mm bolts

Torque down the intake manifold bolts and nuts to the factory specs

Bolt up the fuel feed line and clamp down the fuel return line

Now some custom fab work you will have to bend the galant oil dip stick to fit the outlander tube is too short and does not come close to the mounting point when used on the galant. Use an L bracket to secure the tube to the head.

Make sure all coolant and vacuum lines have some type of clamp on them to get rid of leaks there is nothing worse then finishing up a project and finding out you have to take stuff apart again to fix a small mistake that could have been avoided.

Double, triple, quadruple check EVERYTHING you touched during the install once you are sure everything is in its place Start the car. AND YOU ARE DONE

Here are some pictures during the install
http://i13.photobucket.com/albums/a268/DryBear/8G%20Diagrams/MitsubishiOutlanderIntakeManifol-1.jpg
http://i13.photobucket.com/albums/a268/DryBear/8G%20Diagrams/MitsubishiOutlanderIntakeManifoldSw.jpg

es_fact
12-04-2009, 12:15 PM
Great info! signed for future reference!!!

99Galant4G64
01-17-2010, 07:27 PM
Thanks another thing to add to Project 4G64 Monster!!!

g-ride
02-26-2010, 08:39 PM
ive been looking for this info everywhere and i cant seem to find it, it may be on here but... what exactly are the advantages of the outlander manifold? i know that it is stronger however im curious of what any power gains might be, and if its worth doing...i may turbo my car in the future but are their any advantages without the car being turboed?

GALANT59
03-06-2010, 05:09 PM
my stock broke off last nite...time to upgrade to this setup...thanks for the write out helps

GSpeed
04-18-2010, 08:34 PM
Prophet, would you have photo of the Manifold Support bracket from the Outlander?

krispy03
04-19-2010, 01:05 PM
i used the same bracket off the galants oem manifold, just painted it
http://i2.photobucket.com/albums/y34/KRISPY03/100_0082.jpg

GSpeed
04-20-2010, 10:01 PM
krispy03, thanks for your reply and posting the photo, much appreciated. So the intake manifold bracket (painted black in photo just right of the Evolution emblem) was OEM part on Galant and not taken from doner vehicle (04 Outlander 2.4 SOHC non-MIVEC engine)?

krispy03
04-21-2010, 10:34 AM
correct, its from the galant manifold, i painted and used it on the outlander manifold

Waka Flocka Eric
04-21-2010, 11:06 PM
can anyone dumb down the tps wiring for me...it's the only thing i need to finish up on.

krispy03
04-22-2010, 10:31 AM
"Locate the throttle position sensor again and notice the color and location of the wires in the connecter. If you place the 2 sensors face up (part that connects to throttle body) the galant sensor will have 2 pins on the left then a space then one pin (--x-), the outlander will have 1 pin n the left then a space and 2 on the right (-x--). So now that you notice the difference you will have to remove the wire from the connecter using the sewing needle and rearrange them. The black wire goes to the single pin, the brown/white wire goes on the middle pin and the green/white goes to the other outside pin then reconnect the clip to the sensor."

the wires are color coded, theres only 3

00GalantX
08-20-2010, 06:06 PM
Is the egr valve on the galant the same as the one on the outlander

thestig
09-28-2010, 07:18 PM
has anyone dyno tested the manifold yet to see if it will make a differance power/ torque wise? i got a dyno at my shop i just dont know if i wana buy a new manifold if it wont do anything.

mrg7243
10-13-2010, 11:10 AM
now i was wondering since it does not say in the tut, do we need to get a different throttle cable??, i am going to buy the manifold and use my v6 throttle body with it, instead of buying a outlander one. But i read somewhere that the butterfly on the TB, only will open about 75%.

Question 2, Will i have a issue running the V6 tb since the throttle cable connects on the other side, the v6 TB connects on the right side of the manifold, and the outlander tb connects on the left side on the manifold

IVORY_G
11-03-2010, 06:01 PM
No answers for the man's questions? ^^

mrg7243
11-03-2010, 08:37 PM
ill have to find out myself when i get around to buying it hahah

IVORY_G
11-07-2010, 09:14 AM
Haha thanks Len for posting that I havent been on the boards for awhile, but the swap is very easy... there are a few other things you need that are not on that list on the first post... and some that are there that you dont need....

You dont need the FPR, fuel rail, or injectors.

But you do need the manifold support bracket, and you do need to bend you stock dipstick tube and you do need the outlander throttle cable or you can place washers under the gas peddel to bring it out farther... If you dont do this the throttle will only open 75%.

Also you have to swap the 2 outer wire on the throttle position sensor clip or you will get incorrect readings.

Read the tutorial I covered everything in it with pictures


You need the the Outlander or Evo TPS and you need to swap the wires around inside the connector or else your car will not run correctly:
http://i138.photobucket.com/albums/q260/will_nate/0dbe2a83.jpg

Quoted to add content to this thread.

IVORY_G
11-07-2010, 07:41 PM
Anybody have pix of the fuel/coolant hoses on the TB side? Im mixed up on which ones go where rt now...

IVORY_G
11-08-2010, 10:17 AM
Hey folks I need some help with this swap. Ive run into a few connection questions. Pics below...

This sensor was bolted to the top of the manifold before but now theres no mounting point that I can see:
http://i138.photobucket.com/albums/q260/will_nate/3f02500a.jpg

This comes from the branch of fuel lines, but IDK where to put it now:
http://i138.photobucket.com/albums/q260/will_nate/2deac3d5.jpg

This line goes to the EGR connections but IDK what connects to this? Possibly the fuel line above ^ ?
http://i138.photobucket.com/albums/q260/will_nate/51abd60f.jpg

This coolant line comes from the metal pipeline that runs along the head and connects to the water neck/ thermostat housing, which line does this connect to on the TB?
http://i138.photobucket.com/albums/q260/will_nate/be99975e.jpg

This coolant line runs directly from the water neck/ thermostat housing, which line does this connect to on the TB?
http://i138.photobucket.com/albums/q260/will_nate/6e9aff54.jpg

From what Ive gathered these two lines above ^ connect to these two lines on the TB, but which one where?
http://i138.photobucket.com/albums/q260/will_nate/909685b4.jpg

For those of you who have any clue on this please post your thoughts. Thx

Isaurio
11-08-2010, 12:19 PM
I will try to help you as much as I can. I need to go to the car and take pictures of my settup.

Isaurio
11-08-2010, 01:39 PM
ok answer to your first picture.
http://i726.photobucket.com/albums/ww267/isaurio/IMG_0580.jpg
this picture. Main coolant hose goes to the right side of the tb.
http://i726.photobucket.com/albums/ww267/isaurio/IMG_7169.jpg
on the lefside goes to the engine. I mean you could by pass this lines. Just connect main coolant line strait to the engine.
http://i726.photobucket.com/albums/ww267/isaurio/IMG_1303.jpg
outlander connector you could use the outlander or galant.
http://i726.photobucket.com/albums/ww267/isaurio/IMG_0303.jpg

The main reason for the coolant go thru the tb is to heat up the air coming in the tb Is most for the IAC when engine is cold and it needs to get to operating temp it ajust the hight idle faster when engine is cold. you could always bypass it.

IVORY_G
11-08-2010, 03:33 PM
Thx Bro, I got everything up and running now :)

IVORY_G
11-08-2010, 09:46 PM
So after finishing the swap Ive found out that the speculation in regards to the IAC is false, the Galants IAC works and is identical to the Outlander's; and in regards to the Accelerator cable, we do need the one from the outlander to work, or you would have to somehow modify the galant one by shortening it one to two inches.

Isaurio
11-08-2010, 10:44 PM
Yes, IAC works not the TPS. Galant cable is fine on the oulander and the v6 tb

mrg7243
03-10-2011, 09:09 PM
can somebody please take a picture of the EGR lines on the pass side i need them for mine. Basically showing the brass hard lines to the soft lines going to the EGR solenionds and sensors

djakay
03-10-2011, 10:19 PM
can somebody please take a picture of the EGR lines on the pass side i need them for mine. Basically showing the brass hard lines to the soft lines going to the EGR solenionds and sensors

I completely removed mine and rerouted the hoses bypassing that part, but only because i swapped for the Evo8 steering wheel i got rid of Cruise control

mrg7243
03-10-2011, 10:33 PM
can you post some picts.

Cause mine dindt come with the EGR soleniod or sensors, had the valve but not the stuff to operete the valve. And i am going to fab up the old stuff onto it

mrg7243
05-24-2011, 02:28 PM
Has any body ran the outlander injectors with this???

IVORY_G
05-24-2011, 02:38 PM
Has any body ran the outlander injectors with this???

From my understanding they are the same. So theres no reason to swap over...

mrg7243
05-25-2011, 10:56 AM
From my understanding they are the same. So theres no reason to swap over...

they are not they same actually, that is why i was asking because not only are they different part number but the outlander ones have 12 hole nozzles on them whereas the galants have 4. :wtf: I just did the swap and got a p0170 and one of the possible cause is a injector fueling error and i am running the outlander ones. i am about to swap back to the galant ones but i wanted to see if anyone had ran the outlanders ones and not thrown a code?

IVORY_G
05-26-2011, 07:40 PM
they are not they same actually, that is why i was asking because not only are they different part number but the outlander ones have 12 hole nozzles on them whereas the galants have 4. :wtf: I just did the swap and got a p0170 and one of the possible cause is a injector fueling error and i am running the outlander ones. i am about to swap back to the galant ones but i wanted to see if anyone had ran the outlanders ones and not thrown a code?

Hmm! Interesting... Well the galant ones work so there ya go, lol!

mrg7243
05-30-2011, 01:22 AM
Yeap swapped to the galant ones and was all good. So I will pm prophet and ask him to edit the tut to say only galant injectorss

Prophet
06-01-2011, 10:21 AM
Yeap swapped to the galant ones and was all good. So I will pm prophet and ask him to edit the tut to say only galant injectorss

Thanks Matt for bringing this to my attention. I edited the first post to reflect that information might be wrong...

thegalant
01-26-2013, 07:53 PM
Hey folks I need some help with this swap. Ive run into a few connection questions. Pics below...

This sensor was bolted to the top of the manifold before but now theres no mounting point that I can see:
http://i138.photobucket.com/albums/q260/will_nate/3f02500a.jpg


where does that flat sensor go? I'm done but dont have a place for that yet. thanks

thegalant
01-28-2013, 05:05 PM
i used the same bracket off the galants oem manifold, just painted it
http://i2.photobucket.com/albums/y34/KRISPY03/100_0082.jpg

What connects to the EGR valve? I have the whole thing together and been driving on it for a few days with nothing connected to the EGR. I have the small vacuum line connected to it but those 2 side connections have nothing and I have a short spare hose here, do the coolant lines run to the EGR and then to the TB?

OMEGA PHX
01-28-2013, 05:37 PM
In the outlander IM the EGR valve doesn't have coolant lines, the EGR only uses a small vacuum line and thats it, btw ziptie it cause mine liked to pop off and that made the car feel like it had no power and throw a SES code. I also bypassed the TB so I was only running a line from the water neck to the waterpipe

thegalant
01-28-2013, 05:46 PM
In the outlander IM the EGR valve doesn't have coolant lines, the EGR only uses a small vacuum line and thats it, btw ziptie it cause mine liked to pop off and that made the car feel like it had no power and throw a SES code. I also bypassed the TB so I was only running a line from the water neck to the waterpipe

Thanks for the quick reply. yeah I've seen that the outlander doesn't have the hoses the galant one does. I just wanted to hook it up the way it was before. I just talked to a tech at mitsubishi and he said those are indeed coolant lines, so the water neck and water pipe hoses must make a circuit through the egr and tb. In which order I'm not sure, the instructions I've seen on the swap make the lower water hose going to the right side of the tb and the upper water neck hose to the left side of the tb. It's just heating the air in the tb and exhaust in the egr. just curious why you did the bypass? I've got a couple zip ties ready for when I've decided to leave it how it is, I got new hoses on the vac stuff so I'm thinking it's good for the moment. I didn't get the extending tubes from the outlander so I could mount the vac stuff up and I'm using the standard 4 cyl tb.

OMEGA PHX
01-28-2013, 06:13 PM
It's been said before that the hot coolant running through the TB would get the air thats entering the engine hot and affect performance, so the majority of us when we do the TB swap we bypass the coolant lines aswell, It's also done on other platforms and I haven't seen or felt any adverse effect.

thegalant
01-28-2013, 06:49 PM
It's been said before that the hot coolant running through the TB would get the air thats entering the engine hot and affect performance, so the majority of us when we do the TB swap we bypass the coolant lines aswell, It's also done on other platforms and I haven't seen or felt any adverse effect.

Alright, I wonder if I should do the bypass since I don't have the EGR connected. I'll connect the egr once I figure out which way the lines go into it, I wouldn't think it would matter which way the coolant goes through the egr but maybe it does. I care about mpg, so I kinda want this rigged up right. Maybe I should try it connected and disconnected just for my own satisfaction of knowing. Right now it's running like a top with just the coolant lines through the tb.

dlovin123
03-31-2013, 06:55 PM
I found a 03 outlander with the intake, but how do I b sure it's the NON-mivec intake. The owner doesn't know the answer and I was looking for a way to determine if it's the correct one before I fork over cash.

wetamup2k3g
03-31-2013, 11:39 PM
The non-MIVEC should have a throttle cable; the MIVEC one is drive-by wire, no throttle cable.

2003, non-MIVEC

http://carphotos.cardomain.com/ride_images/2/4397/21/23490010002_large.jpg

2004+, MIVEC

http://imgc.classistatic.com/cps/blnc/130308/333r1/6040hh4_20.jpeg

Hope this helps, and good luck!

OMEGA PHX
04-01-2013, 02:05 AM
If it has the engine just look at it they are completely different, Throttle bodies are different too the mivec ones have a really big electrical plug and the non mivec will look really close to yours but with the throttle cable in the opposite side. And as far as I know 2003 outlanders are all non mivec ;)

Rodriguez
05-21-2013, 04:02 PM
ok, guys. I just got the outlander im in along with the galant v6 tb. How do the coolant/water lines match up to the v6 tb. I know the feed is from the port on the head but where does the return go? also,ifim using the galant v6 tb; then i dont have to rewire the tps do i?

also, how is it that krispyo3 used the galant support on the outlander manifold, theres no way that works.

PR8GG
10-21-2013, 06:18 AM
where does that flat sensor go? I'm done but dont have a place for that yet. thanks
This is still a mystery?! can anyone comment on where to put this sensor? Also, after installing the Outlander intake with a V6 throttle body, do we need to re-flash the Ecu or get some sort of tuning?

OMEGA PHX
10-21-2013, 05:42 PM
The outlander IM doesn't have a spot for the IFS aka flat sensor, when I had it, I attached it to one of the tapped holes on the front of the IM where the outlander throttle cable would go.

XsinshineX
01-19-2014, 09:42 PM
did this swap on an 01 I4 I used to have. I just bolted the extra sensor on top using one of the throttle cable mounting screws. looked odd but didn't have any other place for it to mount.

Rodriguez
01-31-2014, 09:03 AM
This is still a mystery?! can anyone comment on where to put this sensor? Also, after installing the Outlander intake with a V6 throttle body, do we need to re-flash the Ecu or get some sort of tuning?

Ive been running the outlander swap with the galant v6 throttle body and no issues so far...so i would say no tuning is required but dont take my word for it.

tamim13
04-09-2014, 12:21 AM
Ive been running the outlander swap with the galant v6 throttle body and no issues so far...so i would say no tuning is required but dont take my word for it.

Sorry to bump this thread, but did you use the Galant v6 TPS or the Outlander i4 TPS (with re-wiring)? Also, did you have to change the throttle cable, since you are using the v6 throttle body?

tamim13
04-09-2014, 12:39 AM
Sorry, I jumped the gun, I should have searched more, finald8ta has already done this comparison and it looks like the v6 TB with the outlander manifold will have leaks -

https://www.thegalantcenter.org/showthread.php?53476-The-differance-between-Trottle-body-and-intakes-for-the-2-4-litler&highlight=outlander

mysticj
05-21-2014, 03:57 PM
Sorry, I jumped the gun, I should have searched more, finald8ta has already done this comparison and it looks like the v6 TB with the outlander manifold will have leaks -

https://www.thegalantcenter.org/showthread.php?53476-The-differance-between-Trottle-body-and-intakes-for-the-2-4-litler&highlight=outlander

So I know the Evo 8/9 TB has a 67mm ID opening and taper down to 60mm at the blade so what about the Outlander TB? What is its opening ID?

nonsense546
10-06-2014, 03:34 PM
how do you hook up the egr system?

why cant i use the galant throttle?

Black8GV6
10-06-2014, 08:08 PM
how do you hook up the egr system?

why cant i use the galant throttle?
Where do you live? that way someone can take you under their wing

krispy03
11-10-2014, 02:36 PM
ok, guys. I just got the outlander im in along with the galant v6 tb. How do the coolant/water lines match up to the v6 tb. I know the feed is from the port on the head but where does the return go? also,ifim using the galant v6 tb; then i dont have to rewire the tps do i?

also, how is it that krispyo3 used the galant support on the outlander manifold, theres no way that works.

because i am boss

charris
12-05-2016, 09:07 AM
they are not they same actually, that is why i was asking because not only are they different part number but the outlander ones have 12 hole nozzles on them whereas the galants have 4. :wtf: I just did the swap and got a p0170 and one of the possible cause is a injector fueling error and i am running the outlander ones. i am about to swap back to the galant ones but i wanted to see if anyone had ran the outlanders ones and not thrown a code?

I've got the Outlander rail/injectors in mine. I had a P0170 on my old car, but I suspect it was my intake piping. I got some small vacuum leaks taken care of, and the code is gone.

I'm running Outlander manifold, throttle body, throttle position sensor, AND fuel rail. For the throttle cable, if you cut/bend some sheet stock, you can make up your own bracket. It will aim the cable properly and let you reuse the 8G one. If you reuse the 8G throttle cable bracket, the cable will scrape at the opening due to the angle.

http://i.imgur.com/aJOYRWQ.jpg

http://i.imgur.com/Mevc0Ea.jpg

charris
12-21-2016, 10:08 AM
Update on the fuel injector situation:
I'm gonna eat my words, I have an intermittent P0170 (bank 1 fuel trim) error. The long term fuel trim rails at +12.5, and the short-term fuel trim floats around 3-10 in normal driving. It's usually enough to keep the light off, and the O2 sensors are reporting the right mixture, but the ECU isn't happy at the adjustments it has to make to accommodate the injectors.

I've gone over every vacuum hose on the intake path, and they all test fine; I'm completely sure there aren't any vacuum leaks, especially not serious enough to cause this much of a fuel trim swing.

As a final workaround, I'm attempting to use the theory over at C3G about the ISS and base fuel trim (http://www.club3g.com/forum/eclipse-performance/71976-fuel-trims-idle-speed-adjustment.html). I discovered my SAS was set almost shut, so I'm slowly backing it out, resetting the ECU, and driving it for a couple tanks of gas to see if I can push the base fuel trim closer to neutral.