rabeeit

Hi everybody,

I've Lexus GS300 2003, when I'm driving and then after press break and gear on (D), the RPM goes down (0.1 - 0.2) and the car start vibrating until I change gear to (N).

Noting that I have replaced the throttle (with used one) and cleaned it many times, but unfortunately the problem still exists.

FYI: no check engine and no error code, everything seems normal.


Kindly advise.

mk2tmr2

iTrader: (1)

So when it's in drive and you are at a stop with your foot on the brake, the RPM drops significantly?

Have you checked all your vacuum hoses - particularly the ones in and around the brake booster/master cylinder?

rabeeit

Thanks for ur reply.
I haven't check the hoses around the brake cylinder, but do you think if there is a leak, then will get a lack of brake hydraulic oil??
Thanks

Debonair

The vacuum hoses he is referring to transfer vacuum, not fluid. The brake fluid will not be affected by a vacuum leak.

kevwats01

iTrader: (5)

@debonair where on the master cyclinder are the vacuum hoses, any pics

rabeeit

OK, I got your point, thanks a lot.

let me check these hoses by my self or If I can't will take it to the workshop.

rabeeit

I solved my problem, by two things:

1- There was a big crack in the air hose, and rectified this by a glue.

http://im34.gulfup.com/usaMl.jpeg

2- They calibrate the computer of the vehicle.

Now it is performing perfectly.