Low rpm on cold start

[quicknismo]

Hi
I own a 1990 240sx fastback, The problem is when the engine is cold and the air temperature is hot, The engine's rpm drop to 700 rpm on startups. Its starts fine, rpm up to 1200rpm but drops to 700rpm and stays there. I think it should stay at 1200rpm. When the car is warmed up, the rpm are at 950rpm on startups.

I am thinking that its an air temperature sensor problem but not sure.

Thanks

[Dousan_PG]

no
your RPMS are WAY TOO HIGH!
iirc, idle is 700 +/- 100
ill check my FSM shortly

mine idles 700. warm up near 1k, then when car is ok it is 700ish...no more thne 800 max on idle

[deviousKA]

sohc's seem to like a higher idle. my fasback idles at 1100 and the coupe at 950