Ganguskarn wrote:

whatcha wanna know mate i know the system pretty well. im in tas

Ok, symptoms are. Unsteady vacuum especially on cold start, reads (from boost/vacuum gauge connected to inlet manifold) ~ -16 to -12 until the auto-iddeler kicks in where sometimes idle jumps up to 2000RPM. On warm run vac seems to sit on -16. Spool from primary and secondary seem to work but vod seems excessive and boost from primary and secondary seem low; primary 8/9psi, secondary 10-13psi. When vac seems especially low, engine seems to shake or wobble. Really stumped on this one and dont know where to look, heard of problems such as boost solenoid, differential pressure sensor, actuator/wastgate issues, brake booster check valve, PCV, but not sure. Another thing that i picked up on and not sure if this is a cause of the problem is the carbon canister sensor has the plastic broken and had to plug off the vaccum lines either side, was thinking of removing the carbon canister system altogeather but dont know where to begin with that too.

The engine had a rebuild about 15000kms ago and not sure if they reasembled everything correctly.
Pneumatic setup looks a bit like this:
- Vacuum line with restrictor pill from inlet manifold tee'd to 1/ primary turbo wastegate actuator 2/ boost solenoid
- Boost solenoid output tee'd to 1/ air intake (after maf) 2/ BBoD (Exhaust valve solenoid)
BBoD looks untouched and should be as stock. Ill try and get some pics up when i can.

Any tips or advice appreciated. Thanks

Anachronox wrote:

Has this been a problem since the rebuild? (15000kms ago)or a more recent development?
Has the MAF been cleaned or serviced recently?

Recent problem. Subaru changed the AFM sensor to try and fix the problem, which didnt do anything.

idle hunting could be either of a few things,
shitty AICV , leaky/stuck PCV valve , split on the intake tract, leaking exhaust manifold , shitty front 02 sensor, even a coolant temp sensor can do this.
even a MAP sensor

Ganguskarn wrote:

idle hunting could be either of a few things,
shitty AICV , leaky/stuck PCV valve , split on the intake tract, leaking exhaust manifold , shitty front 02 sensor, even a coolant temp sensor can do this.
even a MAP sensor

Good suggestions, ill do some checks. any suggestion on checking the air intake cause it seems to be buried beneath the inlet manifold and looks like a pain to access. Like Anachronox asked, code check came back with nothing, which if is right would mean not a sensor, right? good suggestions about sticky valves, try n check the aicv and pcv. Thx

Hey Guys, havent driven the car much, was away for holidays for a bit and havent had time to deal with the problem. Can somone send me a digram or a pic of where the PCV is? cant seem to find it :S. The AICV is right next to the TB right?

subiB4 wrote:

Anachronox wrote:

As this is a recent development then the plumbing post rebuild was OK.Since AFM has been replaced then I suspect a leak in the system.
Have fault codes been checked?

I second the motion for leak mine had an up and down idle for ages then pinging got bad took off inter cooler and found a crack in induction pipe near primary turbo

nice intake, ive seen then before, resonable price too. Seems like a bit of a headache job though, gotta take the intake manifold off right? seems to be quite buried
I am putting replacement on now