Exhaust Backpressure?
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From: Northern VA
Exhaust Backpressure?
Hi guys, I just wanted to know how long everyones exahuast backpressure valve?? goes till it shuts off. Mine seems to run longer than it needs, well after it is already warmed up. I didnt know if there was a sensor or something that could be off or something like it.
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Mine seems to go on longer each year. It's gotten to the point that if the outside temp is in the 30's or lower the valve will stay on no matter how long or how far I drive. I would love to know if there is a way to put a manual control on it, if it is just getting tired and needs some adjustment/maintenance, or if I can just remove it althogether. Any suggestions?
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From: North East Ohio
There is a sensor that controls this. It is located at the front of the engine, on top, more towards the passenger side, I believe (I threw mine out a while ago.) Attached to it is what looks like a piece of brake line that goes to the pass. side exhaust manifold. You can take this pipe off and clean it out good. Put her back on and see if it helps. If not, it could be a bad sensor. SP Diesel has a little jumper that eliminates the sensor altogether (what I have). I never felt the EBPV did any good anyway.
You can manually control it, too. You need to look on the driver's side of the turbo. There is a 2 prong GM weather pack plug. You can get that same plug and pins at NAPA, and run wires into the cab to a dash mount switch. I can try to dig up a link or explain better, if that's what you want. Very simple either way.
You can manually control it, too. You need to look on the driver's side of the turbo. There is a 2 prong GM weather pack plug. You can get that same plug and pins at NAPA, and run wires into the cab to a dash mount switch. I can try to dig up a link or explain better, if that's what you want. Very simple either way.
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
Post Fiend
Joined: Sep 2003
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From: Mesa AZ
I may be a little confused here....but isn't the backpressure valve needed for several things? My uncle (tech for Ford) said it helps keep the exhaust from getting too cold around the exhaust valve stem which keeps unburnt fuel from collecting on it. If too much junk collects on the valve stem, then it can harden overnight and potentially bend a push rod because it sticks in the valve guide. Bent pushrods quickly lead to other bad things of course. Maybe I heard him wrong.....we were stuffing our faces with turkey and pumpkin pie, so my attention wasn't quite focused. However, he did say these problems are more likely with poor fuel and excessive ideling than anything else. Running fresh high quality fuel and DFAs every once in a while keep deposits from forming.
My backpressure valve disengages as soon as I put my foot on the brake to select a gear.
My backpressure valve disengages as soon as I put my foot on the brake to select a gear.
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I'm not one to argue with a tech, but later in your post you nailed it: It's severe ideling that can cause damage. The EBPV supposedly helps it warm up, but I never noticed anything, and other than that it's useless. If you need that warm up, then buy a winter front. The exhaust valves are the one part of the PSD you NEED to monitor, thus the need for a pyrometer.
Yes, you can gut it and open up the exhaust flow. I'm told it improves flow quite a bit (my whole valve is gone so I don't know).
Or you could wire it to a switch, as previously mentioned, and manually control it, and use it as an exhaust brake, too.
Lots of options.
Yes, you can gut it and open up the exhaust flow. I'm told it improves flow quite a bit (my whole valve is gone so I don't know).
Or you could wire it to a switch, as previously mentioned, and manually control it, and use it as an exhaust brake, too.
Lots of options.
__________________
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
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Freshman User
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From: Northern VA
yeah i will do the same, check the tube but i think i am just going to try converting it to manual control. I'd rather control these kind of things. Thanks for the suggestions
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From: Cabot, Arkansas
My backpressure valve disengages as soon as I put my foot on the brake to select a gear.
Post Fiend
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From: Mesa AZ
Originally posted by cookie88
Don't assume that just because the high idle kicks off, the EBV opens back up. Both are functions of the PCM and can operate independantly of each other.
Don't assume that just because the high idle kicks off, the EBV opens back up. Both are functions of the PCM and can operate independantly of each other.
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From: Cabot, Arkansas
I haven't heard anything. An exhaust brake should actually help the tranny last since it dosen't have to work as hard, but I'm just guessing as my EBPV is long gone, and good riddance to it.
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Freshman User
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From: Northern VA
Does anyone have a good description of how to mod the EBPV to engine brake. I have a 95 250 with an auto but i never could see spending the money for one since i dont pull much but this will give me an excuse to get rid of the valve