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i have about the same situation, sometimes when the car is on heavy load mostly, it will have this sound, from 1st to 2nd or 2nd to 3rd.
it is more prominent (or i started noticing) when i switched to the only time i use 5w40 instead of 5w30. it is also more prominent if i fetch a few persons and the aircon is switched on. which leads to my theory that it happens more often when the car is on heavy load.
at around the same time b4 i notice, i changed atf filter at engine bay, aircon magnetic clutch. there is once as well months before i make the changes, the car just seems to be relunctant to move to 2nd or 3rd. but happen ONCE only.
now the foreman said its because of the magnetic clutch bla bla bla (since its more prominent when i on the aircon while i still on 5w40), saying that i should have changed the whole compressor instead. could be grinding when the clutch engaged. but bear in mind it does happen at times even when the aircon is off.
sharing an update on this. was suppose to update earlier, but believe it or not, i've been busier since MCO started.
and the fact that i didn't test as long as possible the car on the fix before the MCO kicks in.
so a few weeks before MCO i send my car again for normal service. (engine oil change and ATF oil change).
I got the ATF from genuine honda stockist the same time i got the engine mounting (which I have not replaced yet).
the reason why i'm getting ATF from them is going to be reveal below.
and viola..the sound is gone. and remember i did quite a few number of changes last year before the sound start appearing.
before the change recently, i stumble upon shopee during my free time and it suggested me item to look at.
one of the sellers of honda parts was showing the different between packaging between fake and genuine ATF oil (while promoting theirs is genuine, of coz, lol).
and that got me thinking. and tracing back, since i still have one bottle of ATF from previous purchase left. The ATF i had was referred to ask fake ATF.
and that was the only time i bought ATF fluid online
all these while i purchase either from neigbourhood spare part shop, or genuine honda stockist.
i remember a few members have similar symptom with mine. please check yours and try to change your ATF fluid.
hope this helps. i'm in love with my car again.