CX hasn't retrofitted any -400s with auto start, the only A/C with it are the new ERFs which came with it as standard and the ex SAA (RR) BCFs which also have Aux pumps on 1 & 4 as opposed to just #4.
CX have a fairly laborious 4 engine start procedure
#4 engine start
#1 engine start, #4 running at idle.
#2 engine start, #4, #1 running at idle.
#3 engine start, #4, #1 & #3 running at idle
Auto start.
#4 and #3 engine start.
#1 and #2 engine start, #4 & #3 running at idle.
So not having auto start costs CX effectively the price of 4 engines running at idle for every start or there about (6 vs 2). They have around 40 -400s without auto start.
Seeing they've had the 400 for over 20yrs I'd imagine the extra cost of the auto start system would have paid for itself many times over. CX is a penny wise pound foolish airline.
