When i drive my evo the temperature goes up to normal and then drops back down to below C. It will do this every time i drive it.Up and down up and down the whole time.It never stays.

 

your check engine is not on right?

 

sounds like possibly a thermostat issue

 

yup

 

Check engine light is on only because i keep spiking.So should i try a new thermostat.

 

Your spiking what boost? do you have a MBC? I doubt that is the reason the light is on if thats the case. My car spikes like 27-28PSI on pump but only holds at 23

 

I posted a thread on my spiking,yes i have a MBC,im waiting for a boost gauge so i can turn it down.

 

If you dont have a gauge then your prob not spiking your prob overboosting in general. Has you had the light code checked? why not just lower the boost controller all the way for now to be safe? otherwise you are risking your motor

 

I'll do that right now.But why is my temp going up and down? (I turned my boost down).