21 replies to this topic

[Len GT]

Right where to start. Aside from I'm no mechanic and a noob with the set up.

Bought my bg legacy knowing it didn't boost correctly and hoped it would be a simple fix.
It wasn't.

The list.

Both turbo's were rebuilt prior to purchase, receipts to prove.

All vacuum lines have been mapped to correct points.

Turbo's have both been out and tested and work fine.

Bbod was bypassed and issue persisted.

Ecv and intake sensors were checked for operation and no probs there.

There has been more done but can't think of exactly what off the top of my head.

And go!

[tmh983]

need more info on the 'not boosting correctly' symptoms.
Have all the vac lines been replaced? if so, then maybe the restrictor pills are missing?

[Murf B4]

primary boost controll solenoid , bypass this with a bleed valve to test,

[Len GT]

Thanks guys, I dont know if they have been replaced or not, they all look old so I'd assume they are original artifact. i will have a go at the latter and see what that does.

[Len GT]

Also it's an import so the pills would be in different location to ADM pill locations yeah? Any idea where I'd find diagrams on JDM pill locations?

[tmh983]

not sure if the jdm pills are in different spots to the adm ones. Yours is a gen2 tt yeah? They were a bit different, they've got an extra wastegate that the gen3 doesn't have.
What exactly is the problem your having?

[Len GT]

Fuel cut at positive pressure point?
was boosting to 2 or 3 psi but nothing now I think, its been at the mechanics since I bought it back from the mainland.
Kinda deal where the do a bit in their spare time, I pay no labour.

And yeah gen 2.

[Murf B4]

[Len GT]

Thanks, are restrictor pills readily available? If so I'd like to replace all the lines some time soon.

[Murf B4]

MIg tips,?

[acres]

Gen 2 only has one pill. It's at the T in the vaccum line for the primary wastegate.

[Murf B4]

In the pic above^^^

[tmh983]

What error code is the ecu showing?
Could be an AFM problem.

[Murf B4]

try a manual bleed valve across the primary wastgate,

[Len GT]

Got a new Afm didn't work so now I don't need to source one if one breaks

Got a new Afm didn't work so now I don't need to source one if one breaks

[acres]

Diff pressure sensor will cause a fuel cut. It will also throw a code. This might be worth looking into.

[BigWillieStyles]

Thanks, are restrictor pills readily available? If so I'd like to replace all the lines some time soon.

Ive seen restrictor pills for sale recently on uklegacy.com. Also might be worth a search for boost issues on that forum as there are heaps of discussions on gen2 tt setups.

http://www.uklegacy....howtopic=120712

[Len GT]

Someone explain this concept to me please. Why would you bypass? How do you bypass? What it achieves? I assume it's a diagnosis thing. Go!

From what I was told by mechanic all vacuum was passed by flowing all exhaust gas straight in to turbo 1.

[Jimbo]

Dont worry about restrictor pills, its not likely to be the problem.

From what i gather you have a 1st series TT so you have wastegates on both turbos. I would suggest clearing your ECU and starting again to see what code its throwing. My guess is as acres suggested is the Pressure Differential Sensor. Try find someone who has some spares and replace this sensor and if you can replace the entire solenoid clusterfuck, do that too. Can be had cheap, someone is surely using one as a door stop somewhere. The fault your having sounds like electrical dramas sourcing from a sensor or solenoid.

If anything mechanical within the system was naff you would know about it.