gp2m

Thanks Blake. That explains why I don't seet it.

I'll have to think about whether I want to take the intake manifold off. Driving with the AC on doens't sound so bad.

Is there a Lexus tech in Dallas who wants some side work?

I've removed the TB and cleaned it. I do not see anything that looks like an IACV.

I'm beginning to think it doesn't have one.

Here what I have.

Someone familiar with the 98+ VVTI please point out where, if any, the IACV is located.

Thanks!

Bottom center of pic or top left?

I'm with CuriousB... Clean the TB first and try it. If the problem remains clean the IACV. If you remove the TB to clean plan on replacing the gasket, mine didn't come off in one piece. Cleaning the TB is a very common procedure on the LS and usually owners rant and rave about the difference. However, some will also say it didn't make any difference but at least that would be done.

BTW turning on the A/C engages and idle-up circuit so that is normal. Some mask a low idle issue but running the A/C all of the time, I don't think that is how a Lexus owner should roll!

OK Thanks.

Where is the IACV on a 98+ ? Can someone point me to a pic or diagram?

Thanks!

1998 LS400 110k mi.

Starts and runs fine when cold.

Once warm, idles too low, 300-400 RPM, and will die unless either I give it some gas or turn the AC on. No CEL.

Can someone give me some ideas. When I search for my symptoms, I'm just seeing solutions for 1st gen LS400 with the IACV problem. I'm not sure if this one has one or where it is.

Thanks for any input!