EBPV Noise?

[mechjames]

This is my first winter owning a diesel, and we got down below freezing up here. On my way to work, I noticed during accelerating and cruising that the sound of the motor would change, and the engine speed would drop down. It would go away if I accelerated harder. On the way home it drove like normal.

I don't have a full exhaust done yet (it's stock) but I could hear it sound different through my cold air intake.

Here is a video of me driving.

EBPV noise? 7.3 powerstroke - YouTube

EBPV noise? 7.3 powerstroke - YouTube

From other videos i've watched, EBPV noise sounds like a high pitched hissing noise through the tailpipe, and happens at idle too. Mine wasn't happening at idle, but from 1200-1800 rpm it seemed.

Could this also be symptoms of a failing Cam Position Sensor? I've got one in the glovebox...

[351fifty]

whats the thunk thunk sound? is that it?

[mechjames]

From 0:04 sec to 0:08 sec, and 0:42 to 0:50, and 1:13 for a couple secs, then 1:24 for a couple secs

Sorta sounds like a 30 gal air compressor. I give it steady throttle on a flat road, and it comes and goes. It's not from the defrost cycling.

The thunk noise I think you might have heard at 0:26 would be my worn out stiff suspension.

It hasn't done it since, and this morning was cold too (just at freezing, not below).

[erics diesel]

The ebpv will go on and off until the engine is up to temperature. It don't care if your idling or going down the road.