Ebpv acting out!!?
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Logistics Pro
Joined: Jan 2021
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From: Fairhope Alabama
Ebpv acting out!!?
It's a bit weird but, my exhaust back pressure valve is opening and closing over and over again while the truck is in factory high idle. You can hear it in the tailpipe when the valve closes and when it opens. While it's high idling it just intermittently open close, open close, open close. I'm about to be deleting my ebpv anyway, with my new high-flow outlet going on my KC stage 1 that I'm getting soon, but this is weird, wonder why it's doing this. Messed up connector? I'm not sure.
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Logistics Pro
Joined: Jan 2021
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From: Fairhope Alabama
Phew, thought I had more issues! Thanks guys! Just sounded weird because of the fast 3-4 sec duty cycle on it opening and closing over and over. Glad it's normal! Thanks! 
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Logistics Pro
Joined: Jan 2021
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From: Fairhope Alabama
I didn't think tuning would affect that particular function. Interesting. Thanks for the help!
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Logistics Pro
Joined: Jan 2021
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From: Fairhope Alabama
I was actually quite surprised by how much my truck was high idling today. Even after driving and getting the truck all the way up to temperature, shortly after putting the e-brake on it would high idle again. I figured it would have took longer for the oil temp to come down, or maybe it never got up that high. We're going to be down to single digits at night and in the teens and twenties during the day for a few days. Getting a good test for my glow plugs!
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Tuned
Joined: Apr 2004
Posts: 426
Likes: 72
From: Aroostook County, Maine
Consider my surprise when my new to me 2002 - from Arizona no less - all of a sudden started high idling on me one cold AM. Since this rust free specimen has a good functioning brake, I use it even if I don't have to, just to keep it exercised. Which allows that high idle to kick in.
I too have noticed more than once that it would high idle after what I thought was more than enough time to warm up the oil. Then there are times when it won't after a short period of driving. I don't think anything is wrong, or if it is, it can't be that big a deal. Just the fact it works is a huge bonus for me.
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Butt-Head
Joined: Apr 2004
Posts: 9,415
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From: Reed Point, MT
One other misconception is that the backpressure valve and idle-up feature are related or reliant on one another to work. They're not....but factory programming has them timed to where it seems that way.
Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
When it started short cycling like that it was the beginning of a failure, I believe with the EBP Sensor or a clogged tube to it.
It got bad enough that it would remain engaged while driving, drastically reducing performance.
If your going to delete it anyways you can just unplug it at the pedestal. No codes and high idle still works. Mine was that way for years until I did the EBPV delete.
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