Didnt think anything of it until someone on here was saying there truck started to hiss when it was shutdown then 2 weeks later it shot a spark plug.

Is it normal to hear a slight hissing for 5 seconds or less after your truck is shut off? Im pretty sure my truck has done it since i bought it over a month ago.

Thx.

 

do you have an aftermarket intake? when i shut my truck off i hear the pressure coming back out of the filter.....about 5 secs worth

 

yeah most cars/trucks do this at shutdown, mine does it for about 3 seconds sometimes, other times its just a quick hiss

 

+1

 

Stock intake with a K&N filter in it.

As long as its not a sign of a spark plug shootin out im happy !

 

I also have a stock intake with a K&N, and yes it makes a hissing sound when I shut it off.

 

It's just the AC.