Vacuum leak - Hissing sound near throttle body area

[sundarpn]

2002 Camy XLE, I-4.

I notice a hissing sound from near the throttle body, VSV valve area.... at idle.

Also hear a slight/brief whistling sound from the same area, if I rev the motor with the hood open....

I looked for obivious leaks, could not find any...

Any known issues or thoughts?

[white3ch0c0late]

2 things you can do...

(1) Grab a can of throttle body cleaner and start spraying your vacuum lines... if you hear the idle get faster for a second or two and then go back to normal, you've found your leak.

(2) Pick up an automotive stethoscope and pinpoint EXACTLY where the sound is coming from.

[TRD VVTi]

Originally Posted by white3ch0c0late

2 things you can do...

(1) Grab a can of throttle body cleaner and start spraying your vacuum lines... if you hear the idle get faster for a second or two and then go back to normal, you've found your leak.

(2) Pick up an automotive stethoscope and pinpoint EXACTLY where the sound is coming from.

+1.

Where have I heard that before?

Also note that it may be normal. At idle the throttle plate/blade is almost completely closed and the engine as sucking air through that small gap between the plate and the throttle body itself. There is a lot of vacuum taking place at that time which creates noise.

[white3ch0c0late]

Originally Posted by TRD VVTi

Where have I heard that before?

[JSM1284]

Propane from a propane torch works well also, And is not messy like throttle body cleaner.

[TRD VVTi]

If you don't find anything, try cleaning the inside of the throttle body and throttle plate with throttle body cleaner.

Dirty throttle bodies can be noisy.

[fdexclpl]

Originally Posted by JSM1284

Propane from a propane torch works well also, And is not messy like throttle body cleaner.

That is a great idea! No mess!