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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 01-17-2007, 05:14 PM   #1 (permalink)
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Exhaust Back Pressure Valve

Is it normal for the Exhaust Back Pressure Valve to operate once I start driving the truck (after it's been warming up for 10 min.)? I could still hear the hissing this morning as I was driving to work, but it seemd to stop halfway there. I also noticed it when I went out at lunch today. It was 13deg this morning and probably low 20's at lunchtime.
This might be a very basic question, but it's my first winter with a diesel and I just want to make sure that all the different sounds I'm hearing are normal.

Thanks all,
Peter
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Old 01-17-2007, 05:46 PM   #2 (permalink)
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Re: Exhaust Back Pressure Valve

hey pete everything sounds normal to me.. if you had straight exhaust you'd want to unplug it for sure.. mine was singing this am too. here in westport it was 11' this morning
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Old 01-17-2007, 06:31 PM   #3 (permalink)
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Re: Exhaust Back Pressure Valve

Hey tags37, I'm in Somerset. I work in Dartmouth and I was probably close to Westport by the time it started to sound normal. What do you mean by unplugging it? I don't have factory exhaust, and when it sings, it's wicked loud!
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Old 01-17-2007, 06:44 PM   #4 (permalink)
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Re: Exhaust Back Pressure Valve

The exhaust back pressure valve is triggered by oil temperature. If the oil temp is below about fifty degrees the valve will close during light throttle. You can split one of the wires and splice in a switch, which will allow you to manually overide and allow the valve to open. It will set a code but no check engine light. I did this on my early 99, I would run it about two miles on a twelve mile morning commute and then switch the valve open. It recovered the two MPG I lost during cold weather driving.
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Old 01-17-2007, 07:06 PM   #5 (permalink)
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Re: Exhaust Back Pressure Valve

pete.. the plug is at the base of the turbo housing its the only plug down there but is a little hard to find..
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Old 01-17-2007, 07:52 PM   #6 (permalink)
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Re: Exhaust Back Pressure Valve

I unplugged mine at the sensor on the front of the motor to get it to stop hissing NON stop in below freezing temps. Above freezing it seems to be normal but when below the damn thing was on literally all the time.

Does it matter which one you unhook? The sensor or the connector back by the valve itself?
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Old 01-17-2007, 08:14 PM   #7 (permalink)
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Re: Exhaust Back Pressure Valve

not thinking so.. i believe that some were getting ses lights on when the front plug was unpluged

does your truck still go to high idle when its cold?
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early 99 F250 cc 4x4 auto.. gages on the pillar, tymar intake, 5" MBRP exhaust, dp tunner 60,80,120, 30 gallon gravity feed aux. fuel tank, putco chrome on all handles and mirrors, GOS racing headlight harness, clear headlight and corners, accetone badges, blue ovals pelled, zoodad mod
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Old 01-17-2007, 08:36 PM   #8 (permalink)
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Re: Exhaust Back Pressure Valve

I ran the thing with a dead sensor for 3 years and never had the SES light on. All it did was store a code in the computer.

Yes it still goes to high idle when it is cold out.
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2006 F350 Lariat, 6.0 PSD CC LB 4X4. 92k miles.
Wix/Baldwin coolant filter, Dynomax Ultraflow exhaust, cat mod, Edge Insight CS/with EGT.
Mag-Hytec trans pan, 08 Diff cover.
2" leveling kit. RS9000 Shocks. B&W Turnover Ball/ Companion Hitch. Airlift 5000 airbags.
LineX, 20% tint, Weathertech liners.

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Old 01-17-2007, 08:48 PM   #9 (permalink)
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Re: Exhaust Back Pressure Valve

still goes to high idle.. cool i'm unpluging mine tomorrow. i wasnt sure if it would still kick up with it unpluged.
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early 99 F250 cc 4x4 auto.. gages on the pillar, tymar intake, 5" MBRP exhaust, dp tunner 60,80,120, 30 gallon gravity feed aux. fuel tank, putco chrome on all handles and mirrors, GOS racing headlight harness, clear headlight and corners, accetone badges, blue ovals pelled, zoodad mod
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Old 01-17-2007, 08:53 PM   #10 (permalink)
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Re: Exhaust Back Pressure Valve

Where is the sensor on the front of the motor? Think I might give it a try tomorrow too.....
468LC, how did the new 05/6 front end install? Is it a simple bolt-on procedure? I love the new grills, yours looks great.
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