Yes it could be the temperature,
otherwise;
don't use 98 unleaded
use 95 unleaded
Maybe some piece in the fuel circuit is stoping up;
Do a one time oil mixture with fuel,
put 2% oil; motor oil or 4 stroke mixture oil when refuelling.
This might be useless but it might solve the prroblem temporarily or permanently.
I've experienced the problem with a 1VJ,
it was the floater in carb, gluing itslelf in up position...don't ask me why but outside it was very cold and it happened as I drove on road wintertime.
I stopped, tried to start...nothing to do, impossible !
Then I took the grip of screwdriver and hit the exteriour down part of carb where floater is, then pushed start button and pop pop pop pop, it started perfectly.
So oil can eliminate the glue problem of floater or inlet valve..
If someone has changed from driving many years leaded to driving unleaded, unleaded will blow all lead deposits still fixed in canalisations/tank and they might finish in carb.
98 unleaded fuel will destroy rubber as floater, membrane, inlet valve etc etc, as its "acid" like 95 is not, it might turn some rubber as human skin with pores.
Though I think ténéré 3AJ stands 98, i think 95 is better for many reasons.
Hope I explain allright,
Cheers,
Matt
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