When a efi equipped car sits for years,it can cause injector issues.One,or more,of the injectors could be leaking internally due to the varnish that builds up on them while sitting.If you drive the car til it reaches operating temp then turn the engine off & attempt a restart a few minutes later,a no start can sometimes indicate the fuel pressure regulator is defective or a injector(s)is leaking internally.If you turn the engine off and immediately check static fuel pressure then check it again after 60 seconds,pressure should Not drop more than 5psi in that 60 second time period.If it does drop more than that,a injector(s)is leaking, the fpr is defective or there's a leak in the fuel hose between the pump & fuel pump pickup or the pump relief valve.If this pressure bleed off is occurring,you can remove each spark plug & see if its wet with fuel.If it is,that cylinders injector is leaking.To check the regulator,let the engine reach operating temp,let it idle,remove the vacuum hose from the fpr.Is there fuel inside of the hose or is fuel seeping out of the regulator vacuum port?If yes,the fpr is bad.Another check to do is this::when the hot no start condition is present,hold the gas pedal to the floor while you try starting the car.If the car starts after a few seconds,that's another indication for a leaking injector.When the pedal is floored during cranking,that shuts the injectors off to clear a engine flood condition, so the engine starting is your sign there's too much fuel entering the cylinder(s) so an injector(s)must be leaking.
StrayBullitt's post mentioned doing the starting fluid trick,which is also a good test.Just remove the breather tube(between the oil filler neck on valve cover & the throttle body)from the throttle body,spray starting fluid or carb cleaner into that opening on the TB,reattach tube,attempt a startup.If the car starts & runs for a few seconds then dies,you've got a No Fuel problem.If it doesn't start at all,you've got a No Spark problem.
Another common cause for a hot no start is a defective pip sensor or TFI module.Let me know if you wanna test them & I'll post the testing procedure link for both sensors.Be sure to do the maintenance procedure on the salt & pepper shakers too.
91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM