lexus isf rev drops too low to 500rpm

[hhao]

Hi guys, i recently find out that when i am stopping the car , rev drops to 500rpm, and keeps there.   is this normal?

 

my car only travels 12000km, 2014 model

[Sparky]

I think mine sits around 600 with no air con on.. Does it sound rough / rough idle at all? Any shaking through the car?

 

Lucky man / lady by the way, 2014 model 

[BLK ISF]

Was going to ask the same thing.  Any kind of idle surge, fluctuations in your revs vs dropping to 500 and remaining constant.  Possible vacuum leak?

On my old WRX, i had idle surge, ended up being a blown head gasket but im sure no such thing would happen to such a new ISF.

[Sparky]

I checked yesterday, sits at 500rpm at normal idle, and 600rpm with aircon on. So you are all sweet!!

Unless we both are faulty haha!

[ich1ban]

Yep mine sits at the same on idle, fairly sure that's normal. 

[hhao]

i went to dealer for normal service yesterday, and have this issue checked.

mechanic cleaned the throttle , there were some carbon stuck there, now the idle revs comes to 600 rpm, everything is fine  

by the way, mechanic explained that maybe my car had been sit in my car park for too long to have the carbon built up.

[hhao]

12 hours ago, BLK ISF said:

Was going to ask the same thing.  Any kind of idle surge, fluctuations in your revs vs dropping to 500 and remaining constant.  Possible vacuum leak?

On my old WRX, i had idle surge, ended up being a blown head gasket but im sure no such thing would happen to such a new ISF.

mine is just remaining in 500rpm

[hhao]

On 2016/9/12 at 7:57 AM, Sparky said:

I think mine sits around 600 with no air con on.. Does it sound rough / rough idle at all? Any shaking through the car?

 

Lucky man / lady by the way, 2014 model 

no shaking, have the car checked, problem cause by carbon built in throttle, everyhing is all good now.   im a man by the way

[Sciflyer]

This is standard for the ISF it seems, it is not a fault. I suspect it may be for fuel economy/emissions reasons, to set the idle rpm as low as possible. I agree, in reality it is too low and a bit annoying but you can overcome it by turning on any source of electrical drain such as headlights/sidelights, window demister, A/C, etc...  or put it in Neutral :)

[2bling]

Have a look on utube most idle at 700 mine sits at 700, if it isn't a problem don't worry go out and flog the date out of it.This is good advice trust me i am a mechanic cheers.

[ilv1004s]

500-600 rpm depending on a/c on or off is normal

not to worry

[Peter G]

My MY11 is the same. 500rpm without the aircon on.