That is a big temp difference.
I know you have calibrated the T4 gauge.
Was this done for both #1 and #2 engines?
If not try switching the T4 gauges side to side just to see what happens. I suggest doing this even if both are newly calibrated.
You also may have a Temp probe or harness problem..
Make sure both bleed valves are functioning properly. A ground run with the aircraft at a high gross weight will let you do this.
Do the engines pass a power check as per the chart?
Does the aircraft have the particle separators fitted? If so check that.
Long time since I flew one. Usually flew with torques matched.
(Funny story not on a 335…spent some time chasing a high T4 problem on one engine…turned out that the problem was not high T4 on that engine but a false low T4 indication on the other engine.)
Best of luck. Always liked flying in Malaysia. Very nice people.
Last edited by albatross; 12th Jun 2022 at 13:39.