New owner - need troubleshooting help asap

Hey everyone,

 

New owner (well, purchased a few months back) of an 05' LGT w/86k miles. It's been over a decade since I've been in the Subie community. Glad to be back! Also, located in the NW Florida area.

 

That said, I'm having trouble getting this LGT to run right. Bought it mostly stock (intake, lowering springs). The car wasn't running smooth when I bought it, though I was pretty sure (and still am) that it was the previous owner running an intake without a tune.

 

I've added a new Cobb DP, Grimmspeed uppipe, Grimmspeed MBC, new exhaust manifold and DP sensors, and Cobb AP3.

 

I've now found 2 random vacuum hoses that were not connected, and I don't know where they should go. As a modding novice, I'm in over my head, and have a follow-up tune scheduled for Monday.

 

From the video below, you can see the hoses I'm referring to, and how the car is (barely) running.

 

Any advice would be more than appreciated!

 

The hose that came off with the white nipple thing is to your manifold pressure sensor. Did you say you got it tuned? I have no idea how they would tune your car with that sensor disconnected because all of you boost tables are based off of that sensor. Not sure why the Manual boost controller instead of a 3 port but I assume the car is tuned for the MBC? The line not connected goes to your purge solenoid which controls vaccum in the fueling system so that would make it run real rough. Its one of the sensors bolted on the bracket by the turbo inlet.

 

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This may help

 

The hose that came off with the white nipple thing is to your manifold pressure sensor. Did you say you got it tuned? I have no idea how they would tune your car with that sensor disconnected because all of you boost tables are based off of that sensor. Not sure why the Manual boost controller instead of a 3 port but I assume the car is tuned for the MBC? The line not connected goes to your purge solenoid which controls vaccum in the fueling system so that would make it run real rough. Its one of the sensors bolted on the bracket by the turbo inlet.

 

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This may help

 

 

Thanks guys. I'm still just confused with disconnecting the purge solenoid (looking at MCB installs, I think this is the way to do it. But obviously I have something entirely wrong. I don't see how you can run the 2-port MCB AND the solenoid together.

 

If either of you would be willing, I'd Venmo/Paypal to get on a Facetime call today to get some help over the phone.

Thanks guys. I'm still just confused with disconnecting the purge solenoid (looking at MCB installs, I think this is the way to do it. But obviously I have something entirely wrong. I don't see how you can run the 2-port MCB AND the solenoid together.

 

 

 

If either of you would be willing, I'd Venmo/Paypal to get on a Facetime call today to get some help over the phone.

Did the car start to run rough after the MBC install? I think your biggest issue is the line disconnected under the intake. The line looks too small to be the purge controll solenoid so it probably either came off of the black T or of the small black purge solenoid (not the sensor). Also a MBC is not preferable for our veichles because you completely eliminate the ecu's ability to compensate for underboost and overboost conditions. You can do a hybrid setup with the stock boost controller, but why not just get a 3 port if you're getting it tuned?

 

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Honestly I’d put everything back to stock locations as per that diagram (don’t forget the pill) and reattach the factory boost control solenoid for now since you’re under the gun for the tune. Get the car running right first. If you’re not gonna lose a deposit you may want to reschedule. Otherwise get tuned on the factory BCS. Like DW said above an MBC doesn’t really make sense in a car that can control through the ecm. 3 port would be the right way to go but do you even need one with your mods? Your tuner would know best.

I just watched your video again. I think you’re getting that code due to no connection to the map sensor. The little white filter should connect on one end to the front of the intake manifold and on the other to the map sensor which has a nipple on the bottom. Its the sensor on the metal bracket straight ahead of your fingers in this pic.

 

does that help ?

Thanks guys for the help here. dwmccauley01 was gracious enough to jump on a call and walk through vacuum line routing yesterday.

 

I just watched your video again. I think you’re getting that code due to no connection to the map sensor. The little white filter should connect on one end to the front of the intake manifold and on the other to the map sensor which has a nipple on the bottom. Its the sensor on the metal bracket straight ahead of your fingers in this pic.

 

I saw yesterday morning the map sensor nipple wasn't attached, fixed that (coming from the bottom intake manifold. What's interesting is that I have no white filter on this line. I wonder how much that affects things. If you guys suggest, I'll find that part somewhere, splice the line and run it between the sensor and manifold. I also wonder why it was removed in the first place.

 

[ATTACH]285241[/ATTACH]

 

does that help ?

 

That is really helpful to see the routing you normally can't see. Thank you!

 

Getting tuned this afternoon. Car is running terrible, but I'm almost certain that all lines are run correctly for the first time in who knows how long. So my assumption is that the ECU is responding accordingly, and it needs to be tuned.

 

Will post an update here after tune.

https://parts.subaru.com/a/Subaru_2005_Legacy-25L-TURBO-5MT-4WD-GT-Wagon/_54102_6026549/INTAKE-MANIFOLD-INTAKEMANIFOLD-SYSTEM--THROTTLE--06MY/B13-050-11.html

 

In the upper left hand corner is the part, $33.00

While we are at it...an '05 with the stock uppipe running a tune...Might want to go with a catless uppipe.

While we are at it...an '05 with the stock uppipe running a tune...Might want to go with a catless uppipe.

 

It is. I installed a GS catless uppipe a few weeks back. Getting the stock one out without raising the motor or removing the manifold heatshield was a b*&ch.

It is. I installed a GS catless uppipe a few weeks back. Getting the stock one out without raising the motor or removing the manifold heatshield was a b*&ch.

Drop the manifold its not bad. Getting the Oil return line back in from turbo is a bitch

Was supposed to get car re-tuned yesterday. For context - he dyno-tuned it about a month ago. It put out terrible numbers because of all the boost leaks, ACVS acting up, bad MAF, clogged uppipe, etc. So I fixed all those things leading up to yesterday's road tune. But he did tune it.

 

During re-tune yesterday, the left AVCS readings were running from 0-48 intermittently, which tuner was saying what was causing the terrible hesitation and little power. He told me to remove the AVCS solenoid and clean it. Tbh, I didn't think that would make a difference at all. But he was right. At least since last night after cleaning the solenoid (hook up to battery to open/close solenoid while spaying with MAF cleaner, then coating in oil before putting back in), car is running better than it has since I bought it. Pulls pretty hard, flat 16.5lbs with the MBC.

 

Pulling a P0103 - MAF sensor circuit high input with the new MAF. I'm hoping it clears as ECU relearns. Fb knock also occasionally hits -6 or so under low load, low rpm in 3rd gear, which I can't figure out.

 

Now I have to fix completely torn CV boot on driver's side. I'm assuming stick with OEM, correct?

 

And I thought I got a good deal with this car, lol.

Yes, you want to save the OEM axle as long as possible. Any boot from the auto parts store should be fine.

 

So the Tuner did know what he was talking about...