e30m40 low idling when cold...

[selespeed]

hi experts out there; now that i have fixed ther problem of high engine ldling speed, it is now the opposite. usually i remember many years ago when i do a cold start in the morning, the engine rpm would be higher because it is cold. and then returns to normal when (900) when warm. now it isn't anymore - always like 750 to 800 whatever the engine state. any idea what caused this? also, how does ecu know it needs to revv more when cold? is there a temp sensor somewhere? thanks in advance.

 

[datsunnismo]

there are two temp sensors. i believe one for the gauge and another to dme. then send the signal to ivc.

correct me if im wrong.