Got back into it this weekend. Popped timing belt cover off - looking good - no shredded belts. But then did compression test - arrrrrgghhh!!!
Cyl 1 = 95-120psi
Cyl 2 = 45-75psi
Cyl 3 = 70-90psi
Cyl 4 = 95-110psi
(I took multiple readings on each cylinder - results varied each time in ranges shown)
I squirted bit of oil into cyl2 - & took 2 more readings of 95 & 105 (better, but still low).
Another thread claimed min of 145psi for 2.0TS engine - I expected to see at least 150-160.
So I've found cause of my non-starting - low compression - but I'm still bemused how it suddenly occured or why. There was no rough/poor running before this no-start issue.
I popped the cam cover to see if there were any clues from cam positions - I aligned crank pulley TDC mark with lower timing cover TDC mark, and cams look 'roughly right' - I'll have to get camlocks to check precisely.
N.B. For anyone trying to get timing cover off in-situ, you will find it very difficult to get the aux belt (alternator/AC/power steering drive belt) idler pulley undone - it bolts through lower-front of timing belt cover just above crank pulley. I read you can use offset 15mm spanner - but mine didn't fit well enough for torque needed. But if you undo engine support at top/back of engine & the front/lower engine mount bolt you can lower engine on jack just enough to get a socket onto the idler bolt (with wobble bar).
So I'm back to "ideas" on this - engine bottom end has at least 130K miles on it...but I can't believe its just gone 'bang' after 4wks of summer sitting. And the variable compression readings make it feel more like a top end (valve seating/timing) issue