Originally Posted by EXE46

I have an issue with my IS200T. As of late, there's been a hesitation to accelerate. The other day, car completely shut down, luckily i was just moving from a stop light and going into a gas station. Car lost power, I slowly pulled in and Check engine light came on. Added some gas, checked fluids, all seem fine.Also, I only put premium grade gasoline in this thing. Car currently has less than 28k miles so it's not like service is due either. Restart car and it drove normal but it still has been hesitating to accelerate. I will take it in this month for the 30k Mile service and report to the service people. I made sure i took a video with the check engine on.


Would not recommend this motor to anyone, just get an IS350. Luckily my lease ends next summer and with Lexus pull ahead program I should be out of this car in May.

Originally Posted by Max838

Have the same issue with that valve. So just curious where was it located before you placed it next to the dipstick

Originally Posted by vanillatag

I have exactly the same noise issue, and it is indeed the vacuum valve regulator is making that noise. It seems this particular part is not very reliable. I am currently waiting for my 2nd replacement of this part.

The first time I had it replaced was around 10,000 miles. Now at 15,000 miles, the new part is making the same noise again. I just brought the car to the dealer last week and I am currently waiting for the replacement

Originally Posted by LouisV

other then the noise, how do you know you have the issue?

Originally Posted by Sheddy

The valve is located on the intake manifold. See the diagram below with part number 25819.