cwang0202

My IS250 has about 5000 miles on it. Recently, I had a weird problem. I stopped at the traffic light with foot on the brake padel. The car was raddling forward and backward like I was stepping on the brake and gas padel at the same time. The RPM was up and down in the 500~1000 range. Does anybody have this situation before? Or anybody knows what happened? It happened twice on me. Please help.

crazydrago

Why dont you take it to the dearler......the car is brand new and still under warrantiy

Lexus of Glendale

Take it to the closest Lexus dealership and ask them to check.

vlkcheng

did you have aftermarket air filter? If you do, it might be oil contamination on the MAF sensor. Loose lambda sensor can do the same thing.

cwang0202

Thanks for the advice, Vlkcheng. Everything on the car is original. No aftermarket. So, I guess that I have to wait until it does that again, then take it to the dealership.

KikeLexus

iTrader: (1)

Hummm...

Thought I was the only one having this problem.

I own a IS-350 and sometimes it sort of wants to turn off revving between the 500~1000rpm.

It's totally weird. I'm taking mine to the dealership ASAP!!!

No aftermarket parts either...

Any clues???

MLEE4984

Weird, I had the same problem last week at a stop light. I put it in N and rev-ed it a little bit and it was fine again. I have about 5600 miles on my AWD so far, if it happens again, I'm bringing it to the dealer.

-Mike

cwang0202

It seems like that I'm not the only one who has this problem. I want to take it to the dealership, but I know that they will not be able to duplicate the problem. Because it only happens once in a while. I really don't know what to do. If any of you take the car to the dealership, and they can find the problem. Please let me know. Thanks

ff_

cwang0202: My IS250 has about 5000 miles on it. Recently, I had a weird problem. I stopped at the traffic light with foot on the brake padel. The car was raddling forward and backward like I was stepping on the brake and gas padel at the same time. The RPM was up and down in the 500~1000 range.

Lexus Service Manager: All Lexus' do that. It's normal.

cwang0202:

RyanDe680

Sounds like bad gas to me.. I've heard this type of thing happen across various cars...

eddo1

was your engine warmed up at the time? Was it cold outside when this happened?

cwang0202

Yes, it was cold outside.

shaolin

iTrader: (2)

had the same problem with my 99 accord before but they can't find out what is wrong with it. after few month it went away....

can't believe this is happening with the IS...

cwang0202

Lexus service Manager,
I have a 99 GS300 for 7 years and 03 RX300 for 3 years. I never had same problem before. Until this "Brand New" 06 IS250. Why?

vlkcheng

check spark plugs. Any water condensation etc