Normally, when the rx7 is cold and you turn or the car, it automatically goes up (around 3500 rpm) and after 20 something seconds it goes down around 1.100 rpm. My problem is my RX7 stop to do this (I have to do it with the accelerator)

If any of you have some idea what could be wrong in the admission system, I really really appreciate your help.

Thank you in advance for all your help.

 

I believe the accelerated warm up system is only supposed to activate when you start the car in gear. Either that or when you start it in neutral. It's one of the two. Point is, maybe you don't have the transmission in the right position for it to work. If that isn't the case, then maybe the neutral safety switch is broken/disconnected.

 

so does your car die out if you dont press on the gas or does it still idle w/o stepping on the gas?

if it dies out your problem is the thermostat sensor...that is located behind the filler neck, below the alternator but above the waterpump housing it could've been cut off or pulled...and if it still idles then i wouldn't worry bout it too much

 

I think could be the second option (neutral switch).
Do you know how can I check this switch (to be sure if its broken)?

 

Both, sometimes the car die out and sometimes it still idle w/o stepping on the gas.
Last week I changed thermostat sensor and the water sensor but nothing change.

I think there must be some sensor that, when the car is cold, order to the computer or the car (sorry for my ignorance) that it must warm up.

Sorry for my English, but Im native spanish speaker (I live in Costa Rica)

 

hmm....try starting your car with your foot 1/4 on the gas and let go once the car starts that should help fire it up a little