blow off valve?
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New User
Joined: Jul 2005
Posts: 11
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blow off valve?
Do these trucks have a blow off valve? The reason I ask is because when the truck shifts it goes pshhh. I did not notice this until like 2 months ago, and now it seems like it does it more often and louder.
It sounds like it is coming from the center of the engine bay.
It sounds like it is coming from the center of the engine bay.
Senior User
Joined: Mar 2006
Posts: 171
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From: Houston, TX
My truck whoooshes when I shift. That's mainly extra boost pressures rushing out of the airfilter when the engine slows down and reduces the ammount of air intake it needs.
Don't know why it would just show up, unless you did something to the intake.
Are there any intake mods on the truck?
Don't know why it would just show up, unless you did something to the intake.
Are there any intake mods on the truck?
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New User
Joined: Jul 2005
Posts: 11
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its my dad's truck. Now that you say that, it had the same air filter he bought it with. After like 30k miles he finally changed it to a K&N. That seems about the same time I started to notice it.
I was asking this because the mpg has gone down hill
the truck is stock
I was asking this because the mpg has gone down hill
the truck is stock
Last edited by mustangless; Apr 22, 2006 at 04:00 PM.
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
A fresh clean filter should improve fuel mileage. K&N filters allow more air flow that stock and thus the added noise. I would recommend getting rid of the stock air box and installing something else. My choice is the Kwik or 6637 filter. Do a search for specs and instructions. The stock box/ K&N filter combo is bad to allow dust into the intake and turbo and thats not good. As far a the decrease in fuel mileage, something else is causing that. Let us know more about the truck and someone here will help.
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
I really recommend the 6637 filter. It is easy and inexpensive. You can really hear the air and turbo. And the big plus you will be filtering your air better than anything you put in the stock box.
Elder User
Joined: Feb 2006
Posts: 560
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From: San Diego, CA
Get rid of the K&N you are asking for a dusted engine! Go for the Kwik filter mentioned above. The "exhaling" as I call it started happening for me once I put on my intake system as well, but I like it!
Listen to the turbo sing and the engine exhaling!
Listen to the turbo sing and the engine exhaling!
