Looking for known Good

Subaru Liberty ( Australia ) possibly same a Legacy EJ20X Turbo Quad Cam with variable cam timing on all 4 cams

Looking for in cylinder pressure waveform Looking for Crank, Cam inlet and exhaust correlation waveform To help identify is cam timing is still out even though it has had cover off and visually cheeked

Subaru Liberty 11/2003 EJ20X Turbo Twin Cam 2.0 litre Vin #JF18LSKV54003556

Issue Poor performance, intermittent idle poor erratic and seems to have a vibration, goes to stall when going into gear, not a completed misfire and doesn't seem to be an individual cylinder, intermittent flat spot acceleration Check engine light codes below

History

Engine rebuilt some 30000km ago -- has never run correctly according to customer -- rebuilt elsewhere- original engine seized??? Problem seems to be there before rebuilding , Has been to many shops

Was told the engine would run in and performance will be better over time Has been to many different workshops has been on dyno and is down approx. 25% in power

Checked all ECU inputs and outputs

Has fitted a new air mass meter -- whilst readings are better and seems to help a little Smoke tested Inlet Manifold

I have concentrated in other area that I believe is an issue Engine Vacuum whilst running is on the low side 16=17 inches vacuum -using manual gauge and Pico WPS500 Engine Vacuum whilst cranking is 0

Manual compression test around about 130-140psi

WPS compression test around 150psi all cylinders

Wayne Broady
Technician
Broady Automotive
Hornsby Heights, New South Wales, Australia