ClintUK

Ok Guys yet another boost problem.

Have been away for 10 days and I've come home to a duff motor

97UK car hybrid turbo Apexi and 3 port boost solenoid.

Basically I'm getting no boost at all, but the turbo is spinning like a mad thing - noise is not nice, but I'm driving really gently to keep it down sol hopefully I can sort this before i do any damage.

Obviously I'm going to check all the control pipes, but as I'm getting NO positive boost as all I don't think it can be one of the smaller pipes.

Can the boost solenoid play up in anyway?

The noise I'm hearing is a whistling noise that changes pitch as the turbo speeds up - not just linerarly, sometimes it changes in a step up of frequency - almost like a squeak from a wind instrument so I guess I'm hearing a combination of the turbo spinning and the leaking air.

but where's it leaking from?

I had the intercooler pipe blow off a couple of times and the engine pretty mich dies but that's not happening now.

Anyone got any pointers, hopefully will have a look this afternoon.
Cheers

jd5217

just double check all the hoses

johnnyroper

by the sound of it i would suspect it is not a split boost pipe,normally they run like **** and black smoke from over fuelling.

waste gate stuck open maybe? check the clip on the wastegate actuator to make sure it is still on.

if ok check the boost solenoid,one way to do this is connect a small vac pipe directly from outlet on compressor housing to the wastegate actuator you should get 0.6-0.7 bar boost then.

ClintUK

thanks Johnny

Have checked pipes I can easily get at and nothing obvious. I've even checked IC by filling it with water no probs there.

i wondered about the pipe that goes from the IC down the right hand side of the engine and under the IC - it's not easy to see or check and it's old, but what I could see seemed OK.

Will have a look at waste gate I like the though of that. I'm getting 0 positive boost - pain in **** :-(

Cheers

gti00eater

this the exact problim i have at the min happened the other day no 0 bar of boost and a wineing spooling up noise thought the turbo was nackerd tho no sign of smoke or anything if i stay below 2k it doesnt make the noise but the min i touch the throttle it starts spooling up poped the bonet and noticed there was a nut missing off where the up pipe bolts the the turbo and there was a load of black suit around from where the gasses have been comeing out so i asumed it was this but replaced the nut and still doing this realy hopeing it not a new turbo cant afford it lol

Emoe

""this the exact problim i have at the min happened the other day no 0 bar of boost and a wineing spooling up noise thought the turbo was nackerd tho no sign of smoke or anything if i stay below 2k it doesnt make the noise but the min i touch the throttle it starts spooling up poped the bonet and noticed there was a nut missing off where the up pipe bolts the the turbo and there was a load of black suit around from where the gasses have been comeing out so i asumed it was this but replaced the nut and still doing this realy hopeing it not a new turbo cant afford it lol""


In english?

ClintUK

I think now that it's not the turbo spooling that's making the noise but a stuck dump valve after doing further research on here.

Where is and what does the dump valve look like - I think I've found it, but Subaru don't call it a dump valve in their workshop manual.

Adam K

I had a very similar problem, twice, first time it was the BOV, second the wastegate lever that became unfastened....

This is the BOV on a MY98 (right), and a GFB recirc one (left).


And where it's mounted. (left side of IC, facing forward)

ClintUK

Thanks Adam

I have standard one and now I know where it is (It isn't where I thought it was).

Any idea if the standard valve can be 'unstuck' ie repaired or are they a completely sealed unit?

Cheers

Adam K

The plastic is cast, no way to get inside as far as I have seen, they are a diaphragm type anyway so if it si the BOV there's probably a hole in the rubber.
IMHO buy a new one.

ClintUK

Cheers for that Adam
Now hunting for dealers / suppliers

gti00eater

is it that hard to read !!!!!

gti00eater

if it was the dump valve would you not hear it comeing from there ??