EXhaust tone changes while cold idling

[slcpunk74]

I have been looking for a truck for the past little while and I looked at this one today that I liked but... It was already started when I got there and the guy said it hadn't been running long and from the looks of of it I belived him. It seemed to idle fine but the exhaust would changed tones every second or so and sounded like the ebpv was opening and closing. He said it was just the exhaust valve. I know that the ebpv can get clogged but I didn't know if this was what it sounded like.
After a couple minutes it started to idle constant and when I took it for a drive it drove nice and had plenty of power.

Any ideas on that idle tone change?

Thanks guys

[slcpunk74]

So after doing research and watching videos it sounds like the ebpv is opening and closing every second or so... Not sure what causes this. Does the valve need to be cleaned? Does the tube need to be cleaned? Is the sensor toast?

Can I just unplug the electrical connector for the ebpv and not use it?

[trucktractorman]

What year model? My brothers truck does this when the motor is cold. His is a 99 7.3. My guess is that this opening and closing of this valve helps to heat the motor quicker?

[slcpunk74]

This truck is a late 99

[trucktractorman]

Yea then I believe it's normal for that year model.

[slcpunk74]

Anybody else want to confirm or deny that this phenomenon is normal for a late 99 7.3?

[dsnodd]

it's normal.

[Seth14]

I own a late 99 and I can say that mine does not do this.