haha123

Hi,

I am currently driving a 2006 IS350. Usually after turning off the engine, there seem be a smooth pressure releasing sound near the back the engine. I assume it is the exhaust gas or something related. Anyways, for the past couple days, after i turned off the engine, the pressure releasing sound becomes pulsed (pressure releasing sound, stops, pressure releasing sound again, stops again, and repeat). This is occuring after the valve spring recall and I am wondering if this recall or cold temperature, 6 degree celcius, can be the reason. And is it harmful to the engine?

thanks for your advises

quick123

iTrader: (2)

Hard to know exactly what you are describing, but if this is a new sound that has come up since the recall work was done...take it back to the dealer and have them check it out

Micaiah

Quit putting beans and cabbage in your engine........

intellis

I have hard the 'smooth pressure' sound release too but mine does not pulsate. It last about 2 secs. It sounds like the sound when you release air from a tire stem.

vinconist

iTrader: (9)

does this happen after ur engine is turned off for a while or right after you turn off the engine, if its the first situation then its normal

haha123

It happened right after i shut off the engine. So, i started the engine again then turned off and the "sound" became smooth again.


(assuming the pressure release sound = pssssh)
The "sound" that pulsates sounds goes like this: "psssh, stops, psssssh, stops, pssssh, stops, and repeats until there are no more pressure.

The reason I asked because I dont want to be noob when I tell the dealer about the issue and they tell me it is normal.

Also, after the valve recall, my car began to make "ta ta ta ta ta ta" sounds near the throttle body part of the engine under idling and louder under acceleration. I know it is not the direct injection sound because even the lexus dealership's senior service tech said "it is different from the direct injection sound but dont know what it is".

So, i am wondering if exhaust valves or some type of valves is stuck which caused the problem.

thanks for your inputs