EBPV not working?
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Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
EBPV not working?
Fired up my PSD this morning, this is the first time since I've had it that it's been cold enough that it idled up on it's own. It brought itself up to 995 rpm(according to the APCM) but, the EBPV did nothing, tried unplugging it just in case my ears were failing me, and it did exactly nothing. In my prior experience with these trucks, it will idle up and close the EBPV together, and, I've never seen just the high idle alone before.
Do I have something amiss, or is this normal operation I just haven't seen before?
Do I have something amiss, or is this normal operation I just haven't seen before?
More Turbo
Joined: Oct 2003
Posts: 632
Likes: 16
From: Fairbanks, Alaska
The idle can come up without the EBPV closing. It all depends on the ambient air temp and the oil temp. If when it gets colder out your EBPV still doesn't work then the tube to the EBPS (Exhaust Back pressure Sensor) is probably full of carbon. Some people clean the tube out using a piece of wire chucked up in a drill but the tube is so cheap that it is much easier to replace it. The sensor is located on the front of the engine near the high pressure oil reservoir. The tube runs from the sensor down to the right exhaust manifold. The tube is kinda hidden behind the a/c or alt bracket but once you look for it you will see it.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
Originally Posted by 82F100SWB
Fired up my PSD this morning, this is the first time since I've had it that it's been cold enough that it idled up on it's own. It brought itself up to 995 rpm(according to the APCM) but, the EBPV did nothing, tried unplugging it just in case my ears were failing me, and it did exactly nothing. In my prior experience with these trucks, it will idle up and close the EBPV together, and, I've never seen just the high idle alone before.
Do I have something amiss, or is this normal operation I just haven't seen before?
Do I have something amiss, or is this normal operation I just haven't seen before?
Normally (but not always) if the EBPS is plugged it will let you know by tripping the SES light when you've got her wound up.
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Post Fiend
Joined: Jan 2000
Posts: 5,330
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From: Dryden, ON, Canada
Well, I'd like it to work, that thing takes forever to warm up without it, was 28 degrees this morning, My buddy's 01 has been closing the EBPV when he fires it up at work for a week now(take a look at my location, I'm 400 miles north of MN... It gets freaking cold up here)
It is not stuck, I can move it by hand. I guess I'll have to check and see if that tube is plugged.
It is not stuck, I can move it by hand. I guess I'll have to check and see if that tube is plugged.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
If you take a test light and check for power at the plug you will find a weak pulsing signal blinking about three times per second. The test light will blink from one of the leads at all times whether the valve is to be opened or closed. The other lead is ground and will never blink. When the PCM commands the valve to close the blinking signal will continue to blink but just get brighter. So it will blink dimly when the PCM wants the valve open, and blink brightly when the PCM wants the valve to close during fast idle. If all that is proper then you can know that the problem is in the valve solinoid or something else.
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Senior User
Joined: May 2004
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From: Vancouver
If you have somebody turn the key on while you are watching the valve you will see it cycle if it is working. My understanding is that they cycle every time you turn on the key.
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Originally Posted by 95psd
If you have somebody turn the key on while you are watching the valve you will see it cycle if it is working. My understanding is that they cycle every time you turn on the key.
Junior User
Joined: Sep 2004
Posts: 79
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From: Jersey shore
I had the same problem and found that I had a code telling me the backflow pressure sensor was bad. I always read 40 psi even when the truck was off. If the PCM sees a fault with this sensor it disables the valve.
Post Fiend
Joined: Aug 2002
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From: Denton,TX
Originally Posted by cookie88
It's only purpose is to help warm up the cabin air quicker. It dosen't benefit the engine at all.
Unless you live in an extremely cold climate I wouldn't worry about it. Although it is supposed to help the engine warm up quicker, most people don't notice much of a difference once it is disconnected. In extremely cold weather it does help warm up the engine.
More Turbo
Joined: Oct 2003
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From: Fairbanks, Alaska
Originally Posted by johnsdiesel
In extremely cold weather it does help warm up the engine.
Post Fiend
Joined: Aug 2002
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From: Denton,TX
I've kept mine hooked up because in the next couple of years I'm going to be moving back to New England. I agree, it does help keep the temps up. Even when it's 0 degrees idling for a short period of time will cool off the engine.