2002 powerstroke problem

[powersmoke7.3]

my truck is making a weird noise i have a bullydog gt on my 7.3 and its straight piped and when my truck is just crusing and my foot is not in it i loss power and mmy exhoust makes a noise like its sucking air in... any ideas

[forddieseldoctor]

It's more than likely your exhaust back pressure valve kicking in. This is normal. The pcm closes the valve to load the motor to help it warm up faster. You can unplug the solenoid if you really want to. It's white with 2 wires going to it on your turbo pedestal. I've heard a lot of people with pipes complaining about it. My own truck is unplugged.

[powersmoke7.3]

what does it do when u unplug it.. does it effect anything else

[forddieseldoctor]

When you unplug it the valve will default to the full open position. To the best of my knowledge it will not affect anything else. Some people just tie them open with heavy wire, but every now and then the wire breaks and it starts functioning again.