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On my Impreza 2003 UK Sti, I have no boost leaks but over the last few weeks I have noticed increased turbo lag. I think the AVCS is not working (not making the usual on cam noise and sluggish low down) as once boost hits the car is ok. Could it be the filters in the banjo bolts before I remove them. As am I correct Subaru removed these on 05 cars due to this problem? Or am I wasting my time?
It was making a clicking noise when i revved between 1 and 2000rpm when stationery so i searched and searched and eventually found an answer on nasioc.
I was already in a high state of paranoia after engine tuner blew up my first paul finch build they buzzed it and bent 16 valves.
On my Impreza 2003 UK Sti, I have no boost leaks but over the last few weeks I have noticed increased turbo lag. I think the AVCS is not working (not making the usual on cam noise and sluggish low down) as once boost hits the car is ok. Could it be the filters in the banjo bolts before I remove them. As am I correct Subaru removed these on 05 cars due to this problem? Or am I wasting my time?
regards Adrian
The neutral position switch on the back of the gearbox can also stop avcs from working and is an easy test. Simply pin the plug to bridge the connection to simulate the car being in gear and drive it.
The neutral position switch on the back of the gearbox can also stop avcs from working and is an easy test. Simply pin the plug to bridge the connection to simulate the car being in gear and drive it.
Depending on year the switch works backwards to this, just make sure.
Thank you all for the help and advice. Am going to remove the bolts today and check the screens and see if anything changes. Does anyone recommend an app to live data log before so anything else. I have a wireless OBD conector and dash command that I use to reset codes but not sure if that is good enough??
Ok - got the passenger one out - the filter looks like new but have removed it anyway. Cannot see how I am going to check the other side - see pic below - pipe running across the top!!
Last edited by ade_sti; 08 August 2023 at 01:20 PM.
There are 2 banjo bolts in that area. One feelds oil to the cams and AVCS. The other feeds water to the turbo. Don't mix them up. A previous engine builder did just that on my 08 STI. The turbo ran hot and cooked the seals. The one for the oil with the filter has a circular lump on the top.
07 August 2023, 04:43 PM
Avcs not working
