Source
r/subarulegacy•
DrippIV

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Question / Discussion

Hey guys, I have a problem. So my father and bought an 06 legacy gt back in December. Bought it for 3k because the only major problem was a blown turbo...we went from a vf40 to a vf52 and everything was running fine after we got it everything hooked up. I had to go back in and take the turbo of because I had a ripped oil return line that needed replacing. After I replaced it and hooked everything back in, the car started initially and would stay on during idle, but after we shut it off and went to start up again. Problem is now, she starts up but shuts off if left at idle, the car stays on while holding your foot on the peddle keeping it away from idle, but if you let off the car will shut down. I had to disconnect the fuel pump fuse to prime the turbo, but the car still starts, so I don’t believe that’s the problem. I apologize for the long post, but does anyone have any input on what may be the issue before I result to a dealer?

Posted May 29, 2021, 9:18 PM UTC

610
dwntwnDan•

I think you need to have the throttle relearn itself. I had the same issue in my 05 LGT after install the engine back in ( I pulled it to do a whole refresh of gaskets) and I had symptoms similar to what you had. And I kept starting it, and disconnect it from the batteries a few times. And at some point it just started normally.

8
DrippIVOP•

Ok thank you, I appreciate the input

1
OhNoItsNoble•

It probably needs a tune. The ECU is very specific about air/fuel ratios.

3
[deleted]•

[deleted]

1
DrippIVOP•

Well we actually were able to drive it, the previous owner already had a stage 1 tune installed so I got lucky, now if I plan on pushing the car it will need to be retuned but for normal daily driving it should be alright

1
WildMineTurtle•

If you look up anything dealing with Subaru’s and changing anything that adds air or fuel or less restrictive exhaust, you will need a tune. You can get away with running it on stock or a OTS tune for a while but it’s best to get a pro tune as soon as you can if you’ve swapped out any critical areas of the engine. A stage 1 tune from Cobb’s accessport only deals with their air box being installed, after that it’s not tuned correctly for what’s been added. Highly recommend a pro tune.

2
krokislegend•

Check pre turbo leaks around the turbo inlet

1
abaig97•

The factory tune should allow the car to run fine Look into the airbox/turbo inlet hose

Oem turbo inlet hose are very weak and rip easily at the turbo side

Clean ur maf and make sure it's all hooked up

I had the same issue when i had my oem intake not properly secured

1
abaig97•

Source: i ran a vf52 on mine on stock tune for a day when i first installed it cuz i had issues with my accessport not loading files

1
DrippIVOP•

Funny thing is, you mention my MAF and then an error code involving it pops up

1