bustacrab

When I start cold, it will idle at 1500 rpms for a few minutes. Then it'll go down to 1000rpm.... after driving a little bit itll get down to around 800rpms. Is this normal ranges for heating up the engine when its cold out? I dont really see the sense in it since I usually don't sit around before driving off....

howarmat

totally normal just like any other car out there practically

6+6 Stang

yep 1500 for about 2 mins then 1000 then about 750 to 800, and after driving 65 for 30 or so mins, pull in to micky d's for coffee while in drive through in morning it will actually rev to aout 1200 for a second then back to normal.

FastDEW

What I notice is that if you leave it idle for a while it will idle itself up. I was in a drive through that was going very slow and the car suddenly idles up to about 1200 or so and holds there for a bit. It was around 60 degrees outside and I had been driving the car for at least 30 mins.

6+6 Stang

see we both see it dew

FastDEW

Yep, it definately does this. Not sure why but it does. Perhaps some reason for emissions?

I know when it is cold it is trying to warm up the cats quickly, that is the reason for rich burn and high idle when cold. But once fully warmed, I dont know why it does this temporary high idle.....

howarmat

alot has to do if you have the air or heater on and running too.

FastDEW

Okay.... Please help....

Air Conditioning I could see but why heat? How does the heater creat a higher idle?

6+6 Stang

there's a ac in the 2010, lol never used yet

howarmat

defroster uses the AC compressor i believe so i shouldnt say straight heat but when you are using the defroster it will