4 codes
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
DTC P0478 indicates an excessive back pressure condition existed during normal driving.
Possible causes:
stuck butterfly
restricted exhaust
plugged EBP sensor line
misadjusted EPR linkage
New IPR may help the 1211
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
Talyn, how do you check the IPR harness with a meter? Any suggestions on where to buy a new IPR? I never asked Bob at Dieselsite if he had a new one. Yes, you are right about the surge, it wasn't a steady 3700. Bounced around between 3300 & 3700. I don't have bifocals yet, but soon! LOL To help me see it is why I moved it onto the steering column like Jose did. Its out of the sun glare and I can SEE it.
I'd personally take it out so you can wiggle the wires.
IPR harnesses are known to go bad.
Use an OHM meter to test for continuity.
Might have to have the wife help hold the leads into the plugs. Just set it to 100ohms or something. sometimes there is a sound mode, where when there is continuity, it will play a sound. if there is some breaks in the wire, the sound will go bad.
I'd say if you hear cackling in the sound, its probably a broken wire as well, but if your not holding the lead well it will cackle too.
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
You'd have to disconnect the harness from the IPR and the part where it used to clip on the fuel bowl.
I'd personally take it out so you can wiggle the wires.
IPR harnesses are known to go bad.
Use an OHM meter to test for continuity.
Might have to have the wife help hold the leads into the plugs. Just set it to 100ohms or something. sometimes there is a sound mode, where when there is continuity, it will play a sound. if there is some breaks in the wire, the sound will go bad.
I'd say if you hear cackling in the sound, its probably a broken wire as well, but if your not holding the lead well it will cackle too.
I'd personally take it out so you can wiggle the wires.
IPR harnesses are known to go bad.
Use an OHM meter to test for continuity.
Might have to have the wife help hold the leads into the plugs. Just set it to 100ohms or something. sometimes there is a sound mode, where when there is continuity, it will play a sound. if there is some breaks in the wire, the sound will go bad.
I'd say if you hear cackling in the sound, its probably a broken wire as well, but if your not holding the lead well it will cackle too.
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 103
From: Ashland City, TN
That sensor line rick is talking about can cause lots of issues.
You can take it out and let it read atmo, just plug the tube.
The sensor is detecting exhaust backpressure. If you let it read atmo, it might eliminate some of your issues. Especially if the tube is clogged with soot or what not.
I think i read one of the ways to clean the tube was with weed trimmer line, like a square piece of it where it can rub the soot out, and some brake cleaner.
But, Uh, don't quote me on that one. haha.
You can take it out and let it read atmo, just plug the tube.
The sensor is detecting exhaust backpressure. If you let it read atmo, it might eliminate some of your issues. Especially if the tube is clogged with soot or what not.
I think i read one of the ways to clean the tube was with weed trimmer line, like a square piece of it where it can rub the soot out, and some brake cleaner.
But, Uh, don't quote me on that one. haha.
Hotshot
Joined: Feb 2009
Posts: 10,410
Likes: 77
From: Plankinton, SD
I thought none of that was even necessary with the ebpv deleted. I'm sure I read someone just unplugged the sensor and just left it that way. Remove the tube and plug the manifold. I remember this cause I took mine off to clean and stripped threads, replaced it all then was told I didn't need it cause of the deleted ebpv.
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
I'll check it out Talyn and Darin, I remember that thread. Confused me, of course it doesn't take much to do that. lol Travis, that sounds like a 1st approach without breaking it off.
Today I pulled the P/S pump, leaking a lot. They had to order one for tomorrow but the reason I mention this is because I think its so cool that Auto Zone would lend me the tools (puller).
Friday we are leaving with the 5er for five days. I'm anxious to see how it will pull!! It would be a disaster if put into limp mode.
Today I pulled the P/S pump, leaking a lot. They had to order one for tomorrow but the reason I mention this is because I think its so cool that Auto Zone would lend me the tools (puller).
Friday we are leaving with the 5er for five days. I'm anxious to see how it will pull!! It would be a disaster if put into limp mode.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
Yeah, we need to figure out why it's running 3700psi ICP. You cannot use more than 3000psi with your setup so there is no reason to have it. I'd try the IPR..
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
I sent Joey a email and haven't heard back from him on the IPR. I got half way thru the order on his web site and there wasn't a form to say I have a 96, so I emailed. Maybe my scan gauge is like Beans dyno, LOL!!
Senior User
Joined: Oct 2007
Posts: 268
Likes: 0
From: Modesto, CA
As William said, 96 and up are the same.
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
Thanks, I'll just ordered it on your web site, you have one of the photographic memory I have heard so I'll rest assured, LOL. (just ordered now)
Last edited by oldbird1965; Jan 13, 2011 at 11:32 PM. Reason: update
Thread Starter
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
Good info... Glenn has a newer pump so it has the Edge filter in the pump . I do agree with Talyn on the reliability of cleaned IPR's , the small parts inside wear considerably , & tend to react less effectively . When they fail they get stuck ... Open , no start , closed the truck runs with the IPR unplugged...