1991 mitsubishi mighty max want start in cold weather but will when its warm outside what could be the problem?

I'd check the pressure regulator on the pump and the belt tension on the drive pulley.

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you have water/coolant entering the combustion chamber. either the head is cracked or you have blown a head gasket.

you can get pressure specs from your local parts dept, and check injector signal with a noid light

Please confirm which engine your truck has; 3.0 V6?

Thanks,
Tom

That is how the automobiles work. hard to start when cold.
Of course if this is not normal for you, maybe a new battery might help.

problems with the choke, to low fuel float level in carburator, timing to retarded or just problems with your battery or starter if it doesnt crank fast enough

Next time when cold and it will not start remove a spark plug or two and see if the engines flooded. If so there are two things that come to mind; 1, worn injectors, leaking as engine sits with time causing difficult starts 2: bad oxygen sensor, if failed engines tend to run rich and the ECU may have your injectors pump heavy amounts of fuel to keep from running lean; often times you'll see poor fuel MPG if O2 sensor failed.

I hope this may have assisted you,
Tom

Per my Chilton's manual tehe bolts should be (cold engine) 65 to 72 FT. Pnds., the cam shaft bearing bolts should be 8x25 = 15 - 19 Ft pnds and the 8x65 should be 14 - 15 Ft Pnds.

The sequence is as follows for the (10 ) head bolts:

7 - 5 - 2 - 4 - 10

9 - 3 - 1 - 6 - 8

I hope this may help,
Tom

could be coolant temp sensor