vmirjamali

I have a rough idle in my GS400 for some odd reason. It seems to shake when it's in idle, but when i drive or put it in neutral it's smooth. It seems to site at 300-350 rpm at idle as well.

What do you think is causing it? Thanks

alexulan

you can turn on you AC and that will bring up the idle.

This is just masking the real problem however.

Most likely you will need to clean the MAF and Throttle Body.

There are a few excellent DIY threads and, yes I also have a 2000 GS400 and this not only helped with the rough idle and stall at a stop light but also bumped MPG by 1 or 2 up.

Hope this helps.

tamtanium

how many miles on your car right now? if it's over 90k or so check the engine mounts and transmission mount. The rubbers might of ripped off causing the motor to shake freely.

Another one would be take the intake tube out and clean the throttle body.

vmirjamali

Interesting thanks for the tips, I'll look into doing that to help as well

For my own reference later: https://www.clublexus.com/forums/mai...and-gs430.html