erichuang

Hi!
I have just got my car back from the dealer for the engine rebuild, car feels a lot peppier now. However, the vibrant idling in D(drive) is still here and the rpm still dips about 500 when coming to a stop.
I was suggested by my service advisor that it may be the IAC that needs to be cleaned for the rough idle.
Just curious if there's anyone had a similar experience with this idle issue and got it fixed by a full throttle body cleanup or something.

Thanks!

The350Girl

Clean your throttle body and MAF sensor put some fuel injector in your gas tank get new air filter and PCV valve, i don't think you wanna touch IAC on Lexus IS, replace your spark plugs. Remember all Lexus has minor vibration, if you get vibration from the steering wheel you should check Engine Mount and Trans mount, vibration feel from door is normal for IS.

OpPandaCVN

Hi There, I also have the exact issue with my 2014 Lexus IS350. When braking to a stop, the rpm would dip to 500rpm and rise back to around 600rpm at idle in Drive. I can feel the car has more vibrations than before. Feel like it is too low to be idling at that rpm, don’t know what the issue is. Did anyone get a solution to fix it?

2013FSport

iTrader: (2)

Although these have no IACV, the same information applies, clean the MAF and TB, run 91 octane fuel, and every three months, add some techron fuel cleaner. You can also disconnect the battery for 20 minutes and let it do a partial relearn... Negative side only.