WoodyFromBama

When the engine is shut off, just as it completely stops rotating, there is a "poof" sound -- like high pressure air is being [instantly] released. It sounds like its coming from the passenger side of the engine but I can't tell for sure.

Anybody know what that might be and whether I have something that needs to be fixed or not?

Thanks in advance...

Mike ctsV

Sounds to me like the ac dripped onto the muffler and thats what your hearing, mine does it also sometimes, maybe like once or twice and thats it

Byron

iTrader: (1)

Check your PCV system.

​​​​​​-Byron

ls1247

iTrader: (2)

If the expansion valve on the AC isn't holding pressure after shutdown, it'll sound like that. But you would also hear that inside the car.

WoodyFromBama

Thanks all. Embarrassing to say that we were never able to locate the exact place the sound was coming from. Its going in to the dealership this morning to get a fuel pump recall done. We'll let those folks take a shot a locating the sound and its cause.

WoodyFromBama

The dealership service guy said the sound was coming from the aftermarket intake manifold (FAST 102). No more information than that. I'll ask my son to follow up one more time and ask the guy from exactly where on the manifold and [his opinion for] why.

pdxmotorhead

If you have Drive by wire throttle, they often make a whooshing sound as the power goes off from the ECU, I think its the eco stroking it once and parking it an minimum.. ??

WoodyFromBama

Yep, that is it. Thanks.