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DPF Problems
Posted on 6/21/12 at 10:42 pm
Posted on 6/21/12 at 10:42 pm
I have an 08 F250 and am thinking my DPF is kicked the bucket on me at 140k. It cleans the exhaust filter every 100 or so miles. The damn things are expensive as all hell to replace and I dont have enough cash for the full programmer/straight pipe setup. From what I understand, the DPF consists of 2 flow meters and a canister to catch the smoke particulates. When the difference in flow is greater than some threshold, it makes the truck go into regen.
Has anyone ever heard of a cheap fix for it like maybe grounding out one of the wires to the sensors and getting a straight pipe or something? Would I be able to ream out the actual DPF so it is always flowing correctly and wont send it into regen mode? I am looking for the cheapest fix right now, with the expectation to get it right when I get some spare change
Has anyone ever heard of a cheap fix for it like maybe grounding out one of the wires to the sensors and getting a straight pipe or something? Would I be able to ream out the actual DPF so it is always flowing correctly and wont send it into regen mode? I am looking for the cheapest fix right now, with the expectation to get it right when I get some spare change
5
Posted on 6/21/12 at 10:48 pm to Hammertime
I'm not familiar with how the DPF system is set up, so take everything I say as complete bullshite and put absolutely no value in it.
Assuming you are actually going to fix it correctly (straight piping is the correct way BTW) when you get the coin and are current on your inspection sticker, could you just replace the DPF with a piece of pipe and let it be pissed off at you for a little while? Will anything happen other than it throwing a code?
Assuming you cannot do the above because the truck won't run without the DPF functioning or bypassed, you might be fricked.
Assuming you are actually going to fix it correctly (straight piping is the correct way BTW) when you get the coin and are current on your inspection sticker, could you just replace the DPF with a piece of pipe and let it be pissed off at you for a little while? Will anything happen other than it throwing a code?
Assuming you cannot do the above because the truck won't run without the DPF functioning or bypassed, you might be fricked.
Posted on 6/21/12 at 11:44 pm to DownshiftAndFloorIt
Yeah, if I just go and put a straight pipe in, it will throw codes all day and night and will be in regen mode 100% of the time. It needs to have those 2 flow meters reading and inputting flow rates back into the ECU. Now, I have about 50% power 50% of the time. When it kicks in, it is like a rocket.
The DPF really just cleans the soot(unburned fuel) out of the exhaust so hippy greeny figs wont get their panties in a bind when I roll some coal in their Smart car. It catches it and burns it off when the exhaust gets too clogged with the soot. That is what regen is and it runs the motor hotter and decreases power to 20% when doing it so the soot can be burned out of the exhaust.
To sum it up, the exhaust is constantly closing off and only is wide open as the ID of the pipe directly(10 min) after it does this regen. Hence the even shittier mileage and huge decrease in power. You have also seen the new type of exhaust with those tabs pinched in at the tip, right? That is so it can pull more air with the exhaust and look cleaner.
I dont give a shite about inspections because I am registered in NOLA.
The DPF really just cleans the soot(unburned fuel) out of the exhaust so hippy greeny figs wont get their panties in a bind when I roll some coal in their Smart car. It catches it and burns it off when the exhaust gets too clogged with the soot. That is what regen is and it runs the motor hotter and decreases power to 20% when doing it so the soot can be burned out of the exhaust.
To sum it up, the exhaust is constantly closing off and only is wide open as the ID of the pipe directly(10 min) after it does this regen. Hence the even shittier mileage and huge decrease in power. You have also seen the new type of exhaust with those tabs pinched in at the tip, right? That is so it can pull more air with the exhaust and look cleaner.
I dont give a shite about inspections because I am registered in NOLA.
Posted on 6/21/12 at 11:50 pm to Hammertime
quote:
will be in regen mode 100% of the time.
That's what I was wondering. That frickin sucks.
I know how it works, I'm just not familiar with how all the sensors and shite are wired up.
quote:
It needs to have those 2 flow meters reading and inputting flow rates back into the ECU
Flow meter on each side of the filter? Find out what they are both supposed to read. I'm sure somebody out there has figured out what size pipe can be put in place of the filter to get the proper reading at both points to keep it out of regen...
Posted on 6/22/12 at 12:27 am to DownshiftAndFloorIt
quote:
Flow meter on each side of the filter? Find out what they are both supposed to read. I'm sure somebody out there has figured out what size pipe can be put in place of the filter to get the proper reading at both points to keep it out of regen...
Yeah, that's how it judges the amount of blockage by the soot. I am sure that they have a minimum flow rate that is built into the system. The flow might have to be between two rates for it not to throw a code. I couldn't get a smaller pipe because it would just slow down the air coming into and out of the DPF anyway. They would basically be the same speed. That alone would screw with it
This is a cross section of my DPF. As you can see, it is just a screen that catches the larger soot particles before they hit the DOC(cat). God damn EPA
Posted on 6/22/12 at 12:38 am to Hammertime
Are you sure it's a flow meter and not a pressure sensor? Seems like it would make more sense to measure the backpressure and pressure drop across the filter to determine how plugged up it is. If it's a pressure sensor, you could definitely fool that bitch by replacing that filter with a slightly smaller diameter pipe to mimic the backpressure and pressure drop and fool that bitch.
I'm thinking it's got to be pressure sensors. The flow should be constant from the turbo to the tailpipe unless some of the flow is getting diverted somewhere.
Get on the biggest ford forum you can find on the interwebs and ask away. No doubt those bastards have figured out a way to fool that thing with a
I'm thinking it's got to be pressure sensors. The flow should be constant from the turbo to the tailpipe unless some of the flow is getting diverted somewhere.
Get on the biggest ford forum you can find on the interwebs and ask away. No doubt those bastards have figured out a way to fool that thing with a
Posted on 6/22/12 at 7:38 am to Hammertime
quote:
This is a cross section of my DPF
there's your problem. You cut a big hole in it.
Posted on 6/22/12 at 8:13 am to Hammertime
Try looking on the ford-trucks.com 6.4L forum. They have a lot of good info on there.
Posted on 6/22/12 at 8:30 am to BayouKR4
Sure gland my truck don't have that crap. 
This post was edited on 6/22/12 at 8:31 am
Posted on 6/22/12 at 8:37 am to fishfighter
Removing mine was the best thing I ever did to my truck. It sucks that the govt has decided to reduce mpg withthis sort of bullshite on our trucks . I have had mine off for almost 100k miles.
Posted on 6/22/12 at 8:40 am to Hammertime
I'm guessing a DPF delete and a mild Spartan tune aren't in the cards? Honestly that's probably the best solution.
Posted on 6/22/12 at 11:23 am to YOURADHERE
Trust me, if I had the cash it would have already been done. So after much searching, there is no cheap way out. I asked Ford and they quoted me $2600 installed. Spartan with a whole exhaust system is $1500. I was hoping someone knew a little bit more about the system so I could try and work it out. The Ford truck guys tend to have around a 65 IQ
Posted on 6/22/12 at 11:40 am to Hammertime
Get you a H&S tuner with dpf delete program, a converter and dpf delete pipe (these will go from the turbo down pipe to the tail pipe) and be done with that junk. Did that on mine. More power. Better mpg. Less hippie.
Eta: cost me about $800.
Eta: cost me about $800.
This post was edited on 6/22/12 at 11:41 am
Posted on 6/22/12 at 11:58 am to Buckshot
The Spartan tuned 6.4s put down mid-500s in hp, and easily 1000lb-ft of torque. That would probably make my package three times as big, but my wallet would be 7 times as small
Posted on 6/22/12 at 12:03 pm to Hammertime
I am not in the car business, but am in the diesel/heavy equipment business. I didn't realize that the '08 Power Stroke was already using that technology. You are pretty much correct with the way the DPF systems work. However, yours may not actually have anything wrong with it. The DPF filters have to be removed and cleaned periodically using a special cleaning system. If your local Ford dealer doesn't have one, take it to an "on-highway" truck dealer or OEM engine dealer (CAT, Cummins, Freightliner, Mack, etc). Most of these guys have DPF filter cleaners that will regen it to "like new" specs. I am in the CAT business, our counterpart in your area is Louisiana Machinery. Ask to speak to someone in "On-Highway" truck service if you can't get help with your local Ford guys.
Address: 3799 W Airline Highway
Reserve, LA 70084
Phone#: 985-536-1121
Address: 3799 W Airline Highway
Reserve, LA 70084
Phone#: 985-536-1121
Posted on 6/22/12 at 12:03 pm to Hammertime
Posted on 6/22/12 at 1:18 pm to Labsolut
From talking to all of the guys driving big rigs, these Gen 3,4,5, and 6 motors aren't worth a shite. I know of a few that absolutely will not buy a new truck because the motors are garbage and the costs associated with them are astronomical.
I actually worked for LA Machinery for about a month art the end of last year, but never heard of cleaning a DPF
I actually worked for LA Machinery for about a month art the end of last year, but never heard of cleaning a DPF
Posted on 6/22/12 at 2:36 pm to Hammertime
Once the powertrain warranty is up on my 08 chevy 2500HD that shite is coming off as well. Mine hasn't given me any trouble though but i am having fuel pressure loss and trouble starting due to a cracked water in fuel sensor so the truck is parked until after market replacements come in next week 
Posted on 6/22/12 at 4:35 pm to Hammertime
So from what I've read, the ECU measures pressure and temp before in and behind the DPF. Seems to me like you could figure out what the pressure drop across the filter is supposed to be when it's clean and restrict the exhaust just enough between the sensors to tell it what it wants to hear without having to re-program the bastard.
Posted on 6/22/12 at 5:26 pm to DownshiftAndFloorIt
quote:
So from what I've read, the ECU measures pressure and temp before in and behind the DPF. Seems to me like you could figure out what the pressure drop across the filter is supposed to be when it's clean and restrict the exhaust just enough between the sensors to tell it what it wants to hear without having to re-program the bastard.
Thought about that for 1 second. Restricting the exhaust to the normal DPF pressure would be just the same as having it on, of course without it going into regen all of the time. It slows down the exhaust going through it because of the filter and trying to find a small enough pipe to make it work would basically do the same thing. Still only decent power and garbage fuel mileage. Someone with more time can do all of that testing for me. ME curriculum is flat out kicking my arse this summer. It probably wouldn't be worth the time invested to n'rig it up considering I have 3-4hrs of homework a night
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