05 GT Vacuum routing issue

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05 GT Vacuum routing issue

Postby mike16889 » Mon Dec 31, 2018 3:16 pm

Just had my engine swapped (for a wrecker engine, old one had bad rings) and it appears the guy that did it for me screwed up the vacuum lines.

he had the fuel regulator line hooked upto the bypass valve and the wastegate line strait to the manifold. there is also a line from an actuator at the at the front of the manafold just tucked under.

I have found a couple of diagrams online but they both mention a black tee and a blue tee, both seem to be missing.
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Wed Jan 02, 2019 2:41 am

http://legacygt.com/forums/showthread.p ... 43225.html
That’s for a 2.5t usdm engine but there should be some similarities...
Also try the diagrams on eg opposed forces or your fsm.
FSM etc: viewtopic.php?f=6&t=34980


...
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Wed Jan 02, 2019 2:46 am

The specific areas to check are fpr to inlet mani pass side, turbo compressor to wastegate to boost controller, fuel purge, the latter two at the front of the inlet manifold, and bov ref hose which goes to the rear center of the inlet manifold.
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Re: 05 GT Vacuum routing issue

Postby mike16889 » Wed Jan 02, 2019 2:43 pm

ok, i have sorted the fpr to the port on the side of the intake.

the black t near the turbo exists and 2 of the lines are connected to the turbo as they should be, the 3rd line from the black t goes to a port on the back of the intake manifold.

that leaves the bov (bypass valve on the intercooler) unconnected and a solenoid on the front of the intake unconnected:
Image


that thread you linked to is the one i was looking at for the diagrams. also i have the fsm but have yet to find the vacuum diagram in it, not sure where to look.
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Wed Jan 02, 2019 5:50 pm

Blue plug is boost control solenoid, the one adjacent is map sensor then fuel purge solenoid.

Take a good look at this diagram from the thread I linked above:
https://legacygt.com/forums/showpost.ph ... stcount=15

Damn! This pic:
https://legacygt.com/forums/attachment. ... 1384657978

You’ll see the diagram is a mashup of a few different pages, eg looking at the inlet manifold from the front and rear, the inlet pipe from the front etc.
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Re: 05 GT Vacuum routing issue

Postby mike16889 » Wed Jan 02, 2019 6:33 pm

Ok, so line from turbo should be going to the "purge valve" under intake (not he port on back of intake)

the disconnected line in my photo should be going to the port on the front of the intake and the other line to "hard line" near the "purge valve"?

the other line from the purge valve should go to a t, then to the back of the manafold and to the "bypass valve" on the intercooler. and one final line from the purge valve under the intake to the intake duct (before turbo) is this correct?
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Wed Jan 02, 2019 6:47 pm

Zoom in on the last pic linked.
Note that it’s for a usdm car, and a 3 port ebcs, not the stock 2 port.

The turbo should have a tee joining the wastegate to the compressor, the long side of the tee goes to the ebcs.
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Wed Jan 02, 2019 7:05 pm

So yeah, I’d take a rough guess and say that disconnected hose on the boost controller goes to the turbo tee.
If not, it’s the return to the inlet.
If you hook it up and test drive it, iirc you will either get boost as usual or only wastegate pressure if wrong way about.

See the second hose on the boost controller?
Trace that back to its termination, hopefully it goes to the intake.

I’ll put out a help request on FB, it’s crucial that you get this hooked up correctly.
Ideally you’d have logging and or a boost gauge for the test drive.

If and when you do test drive it, just ease into it, and back right off if you encounter anomalous behaviour, eg backfires under boost.
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Re: 05 GT Vacuum routing issue

Postby mike16889 » Thu Jan 03, 2019 12:38 pm

I does go back to intake (before turbo) so the disconected one goes to the turbo tee, does that mean that the bypass (on the intercooler) go to the port 9n the back of the manafold?

the car is not currently registered so when i take it for a test drive it will only be to the end of the street anyway.
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Thu Jan 03, 2019 12:41 pm

Yep. Correct on both counts I’d say.
Cross posted to FB lib club:
https://m.facebook.com/story/graphql_pe ... Q2NzQwMzQ2
Yep, pretty much confirmed.

Fpr is just a single hose to side of inlet mani.

Whilst you’re at it, I’d recommend ziptieing all of the little hoses, and check for cracked hoses, especially those in the fuel purge area.
Last edited by bigBADbenny on Thu Jan 03, 2019 1:00 pm, edited 1 time in total.
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Re: 05 GT Vacuum routing issue

Postby mike16889 » Thu Jan 03, 2019 12:57 pm

thanks, ill head out now and give it a shot.

did you end up putting a help request on facebook?
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Thu Jan 03, 2019 1:01 pm

Linked above ^
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Re: 05 GT Vacuum routing issue

Postby bigBADbenny » Thu Jan 03, 2019 9:05 pm

Ok I found the Lib GT 2004 DOTC engine section FSM PDF:

https://drive.google.com/file/d/1kmnIF6 ... sp=sharing

Way easier to search the whole doc using keywords :P

And you can compare the procedural info there to the parts catalogue on Opposed Forces. Relevant page linked:

http://opposedforces.com/parts/legacy/e ... tration_1/

Keep us posted with progress and queries!
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