Just bought a 2005 used. There is a "air escaping" kind of noise during acceleration. It sounds just like the AC system does sometimes after you turn off an engine. I thought originally that it by be AC related, but doesn't appear to be. At steady speed, it goes away, but comes on again with the slightest bit more gas pedal. In cruise control, it cycles on and off when the cruise accelerates up a hill,, etc. The sound is on the driver's side apparently close to dash corner.


Any ideas?

 

Kind of like a vacuum link of some kind. Only under acceleration.

 

are you sure its not an IWE trying to engage due to low vacuum when under load? that would be my inclination.

 

Im not sure of anything. Ive had several F150s and no noise like this. It does sound like a vacuum leak does.

 

I looked at the sticky about IWEs. My truck is not 4WD. I dont know if that makes a difference or not. Im not very familiar with what an IWE system is or does.

 

well, you can throw out my idea then.

 

I've looked up vacuum schematics for 05s. Number one, I can't read them all that well, but I can't seem to find anything vacuum related on the drivers side up by the firewall. Not saying there isn't something there, just I can't find it.

 

check to see if you got a TBS installed... just an idea.

 

Restricted exhaust?

 

This^^^^^^^^^^^^^^^^^^^^^^^^^


Cat or cats are prolly melted down