Ls400 Rev's Dropping Until It Stalls

[Leeky]

hey guys, been a while since i posted on here. i hope all is well :winky:

My dad bought an LS400 earlier this year and it seems that after you have driven it for around 30mins the revs begin to slowly drop.

I drove it down the A33 today and at the M4 sitting in traffic it was idling at 500rpm

Half way down the A33 it was at 200rpm and 5mins down the road again it was just hovering above zero

Anyway it did cut out not long after it was hoving above zero but once you start the engine again its back up to 500rpm as per normal.

Any ideas?

Idle Valve Controller?

We've already tried resetting the ECU......

[steve2006]

Hi,

I would start with vacuum hose checks then with the throttle body clean then poss the TPS. Do you have the EML on? might be worth plugging in the diagnostics reader

[GoldfingerLS]

The low idle problem seems to affect some of these cars once they start to get a little old. But don't let that put you off the fact that you have bought one of the world finest luxury saloons.

There is someone on the US LOC forum that has had this problem which you decribe and has fixed it. Please see this post.

http://us.lexusownersclub.com/forums/index...showtopic=32877

Please let us know how you get on. :)

Thanks.