gsimba

idles high in the mornings or if its been sitting for a while. Around 1600 RPM and when warms up come down to like 600 RPM. Lexus says it needs idle speed control motor at $900 parts and labor. . I've search all over the net but doesn't seem to be such a thing as an idle control motor. There is idle control valve though. Anyone knows anything about this? Where is it located?

GRAND_LS 4

iTrader: (2)

I think thats normal, isnt that what its supposed to be doing?

ThaDRD

Sounds normal to me.

ozbear

Yep mine does the same. Simply to get the juices flowing and warm things up quickly. If it ever stops doing it then get worried!

hyperopt

1600 RPM is a bit high for my taste but not a series concern. Both my LS idle at my ideal 1300RPM when cold making gear shifting less stressful.

I believe the idle speed control motor in which Lexus refers to is the idle speed control valve.

Btw, what year is your LS?

GRAND_LS 4

iTrader: (2)

Thats what I thought as well, till i noticed he lives in MN.

LexLS

It's normal for it to be high when you first start the car on cold days. As long as it drops back to normal range once the car has warmed up I wouldn't worry.

hyperopt

It's normal for RPM to be higher when cold but it's not normal if RPM is too high. My LS used to idle cold around 1800RPM that was a NO NO. Engine mounts went out pretty early in that car as the result.

qcruzer

I had mine rebuilt by a local mechanic a couple of years ago and it is still working fine. It costs me about $500 parts and labor. If it goes bad again, I think I will replace it myself since it's not too hard to get to. It is located in the front of the engine, on top, underneath a plastic cover. There are 3 small bolts (I believe) holding it down. You can find used ones at salvage yards for probably around $200-300. Mine went out just after I bought it and I didn't have time to diagnose and repair it. BTW, I have a 1990 LS400. Hope this helps you.