My 1998 Jimy requires (spraying) starter fluid to start first thing every morning. After that subsequent attempts at starting do not require starter fluid. Throughout the day if I turn it off and it it sets longer than 1 hour I have to spray it to start it. What could be causing this?

no
you fix the reason why the injectors are not working
could be fuel pump , pressure regulator , injectors , wiring or ECM
have the fault codes read

Today's gasoline goes bad very quickly. If car sat unused for over three months, fuel may have gummed up pump or filter or even injectors. (Disregard if diesel) Try using small amount of spray starter fluid to see if it starts for a moment. If so, fuel system may require service.

if it starts with starter fluid then its a fuel problem. check the fuel pressure and volume with a gage. these require at least 56lbs pressure to open the injectors and if the pressure is at 52lbs the they will not open. these use the pressure to open the poppet injectors and have a problem with the spider lines cracking and leaking fuel inside the intake. this is probably why it won`t start on its own.

Fuel pump issue.--

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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This will help.
Thanks.

In a lot of cases, this is an indication that the starter is faulty. A bad starter will often start a car when it's cold (ie first thing in the morning or after sitting a few hours). Once hot, the starter requires more and more energy to turn over. If when hot, you are able to start the car with a jump start, the starter would be the first place to investigate.

You have a fuel starvation problem, fuel pump, pressure regulator, injectors, any or all of them could be the reason why you are not getting fuel. Someone is going to have to lay hands and eyes on the thing and check it out.

The first thing you need to check is fuel pressure. This type of fuel system requires a minimum fuel pressure of 56 psi to start. Anything less, even as little as 1psi. And it will not start. It starts and runs when you add the starting fluid because the poppets (the mechanical injectors located at each cylinders intake runner) require less fuel pressure to operate when the intake is under vacuum.

This is a classic symptom of low fuel pressure. A new fuel pump is the typical fix for this problem. Don't skimp on quality if you do need a new fuel pump. They are not all the same.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

OK. Do you mean that the start won't turn over when hot( in which case the starter is the cause), or do you mean that the starter turns it over but the engine doesn't run immediately (in which case an engine analysis and code reading may be required)?

well the first part of your question i was all ready to tell you to put a new fuel pump in, now not so sure, there is a relay for fuel pump, can you hear pump cycle and relay click? relay under hood you will have to listen close they don't run long maybe a couple secounds, if you don't relay bad. if you do pump could be bad, do fuel pressure test pump could be weak. don't think sunroof and turn signals are related, but stranger things have happend.

YOU NEED TO HAVE A CAN OF STARTER FLUID READY ON THOSE COLD DAYS TO SPRAY IN THE AIR BOX!

yOU SHOULD fiRe RiGhT uP!!!