Disable EGR ?

[jimnance]

Since the EGR system seems to be the culprit causing excessive soot in the oil, has anyone figured out a way to disconnect the EGR system and fool the computer?



I just did my first oil change. The "Change Oil" warning light came on at 2800 miles. As soon as the engine was started after the oil change and oil level was checked you could already see darkening of the new oil.

 

[RHestand]

Since the EGR system seems to be the culprit causing excessive soot in the oil, has anyone figured out a way to disconnect the EGR system and fool the computer?



I just did my first oil change. The "Change Oil" warning light came on at 2800 miles. As soon as the engine was started after the oil change and oil level was checked you could already see darkening of the new oil.

Ditto that,

With the excellent by-pass oil filtering systems available for our trucks,the oil could look like honey, instead of tar.

 

[grasmo]

my oil change required light comes on about every 1,500 miles and has since the truck was new. My dealer gives me free oil changes for life. I now have 10k on my truck and have had 5 oil changes. My dealer has re flashed my computer almost every tie it has been in and says he is keeping his fingers crossed . Also my check engine light has done 2 different things. One is come on and stay on until dealer clears the codes. Two is comes on and of at what seems to be random. The first trip the dealer said the code was for using the wrong kind of diesel. Guys I hate to say but this ulsd is a racket. Put a DPF on the space shuttle and save the planet.

 

[DPKetchum]

Oil has been turning black quickly since 05. They didn't have EGR.

 

[jimnance]

I have an '05, and while it does dirty the oil more quickly than my earlier trucks, it's not nearly as bad as my '07. 5. OTOH, I have an Edge Attitude on set on level 1 on my '05.



I wonder if it's the EGR as well as retarded timing that is the issue?

 

[Drdorian]

Since the EGR system seems to be the culprit causing excessive soot in the oil, has anyone figured out a way to disconnect the EGR system and fool the computer?

The culprit to frequent oil changes is fuel in oil dilution, and all the extra/bypass filters in the world will not take the fuel out of the oil. Unfortunately unhooking the EGR system will not buy you anything in regards to the oil changes.

 

[jimnance]

How is the oil becoming diluted with fuel? I'm guessing it has something to do with the DPF regeneration cycle. Is the extra fuel for the regen coming from running a super rich mixture during the cycle?



I guess I'm confused how the fuel is getting by the rings in sufficient quantity to dilute the oil, or is there another mechanism at work her?



Thanks for helping to educate a poor Oregon Duck.

 

[Drdorian]

How is the oil becoming diluted with fuel? I'm guessing it has something to do with the DPF regeneration cycle. Is the extra fuel for the regen coming from running a super rich mixture during the cycle?



I guess I'm confused how the fuel is getting by the rings in sufficient quantity to dilute the oil, or is there another mechanism at work her?

You are correct, the fuel is getting in the oil during regen. Fuel is injected on the exhaust stroke and out it goes, since it is not all being burned (as it usually is) then some is slipping past the rings. Depending on if you have your oil analyzed you can find the percentage... . but something in the neighborhood of 4-5% is too much.

 

[sag2]

I believe once the final flashes are complete they will have to flash the overhead to alter the algorithm for oil change interval. Each flash has seemed to clean up the soot accumulation so it only makes sense that it is also putting less unburned fuel in the crankcase. For now though, unless you have an analysis done I would not ignore the oil change indicator.

 

[Vaughn MacKenzie]

You are correct, the fuel is getting in the oil during regen. Fuel is injected on the exhaust stroke and out it goes, since it is not all being burned (as it usually is) then some is slipping past the rings. Depending on if you have your oil analyzed you can find the percentage... . but something in the neighborhood of 4-5% is too much.

Actually I think most of the fuel for regen is supplied by the fuel line that leads directly to the DPF. . .

 

[courierdog]

Fuel dilution

There is no fuel line or injector in the Dodge/Cummins exhaust aftertreatment system.

 

[DieselLady]

Actually I think most of the fuel for regen is supplied by the fuel line that leads directly to the DPF. . .

There is NO fuel line leading to the DPF. I can personally vouch for this as I have had mine off already. The metal lines running to the DPF are for pressure sensing before and after the DPF. Not for injecting fuel.

 

[NBoyd]

Just Curious , if EGR draws exhaust gas to cool the combustion, but where it is being drawn off the exhaust flow it contains high quantity of soot. Why not draw off after the DPF (Soot free) wouldn't it have the same effect on cooling the combustion ?



N.

 

[DieselLady]

Just Curious , if EGR draws exhaust gas to cool the combustion, but where it is being drawn off the exhaust flow it contains high quantity of soot. Why not draw off after the DPF (Soot free) wouldn't it have the same effect on cooling the combustion ?



N.

Well first of all there isn't enough pressure to overcome boost pressure if you take it from after the DPF. Second they are taking all the EGR from the 1-4 cyl at the exhaust manifold, and then they are richening the 5 &6 cyl so the turbo won't loose spool.

Third,,,, and I am no expert by any stretch, but,, I don't think they are actually trying to cool the combustion as much as to put the flame out a bit. This makes it less efficient and produces less knox. Apparently the more efficient the engine is, the more knox it produces. Cooling the combustion is what the intercooler does when cooling the air charge and makes it more dense with oxygen thus burning more fuel. Adding EGR makes the air charge hotter and less dense with oxygen and less efficient. Rediculous if you ask me!!!#@$%!

 

[NBoyd]

Well first of all there isn't enough pressure to overcome boost pressure if you take it from after the DPF. Second they are taking all the EGR from the 1-4 cyl at the exhaust manifold, and then they are richening the 5 &6 cyl so the turbo won't loose spool.

Thanks I was wondering if it was a Pressure issue, but I didn't realize that they were only polluting CYLs 5& 6.



N.

 

[Drdorian]

Second they are taking all the EGR from the 1-4 cyl at the exhaust manifold, and then they are richening the 5 &6 cyl so the turbo won't loose spool.

That's not entirely accurate, the exhaust gas comes out of every cylinder, #1-4 are not isolated for this. The EGR cooler sits back by #6 but that does not mean that exhaust gas is only taken on #1-4 vs all of the cylinders. I don't understand the "richening" of #5 and 6? Exhaust gas is mixed w/ fresh air and put into the engine, the entire engine. Regeneration uses all 6 cylinders, not just 5 & 6.

 

[DieselLady]

Thanks I was wondering if it was a Pressure issue, but I didn't realize that they were only polluting CYLs 5& 6.



N.

They are polluting all the cyls. Just adding more fuel to 5 and 6 as the take EGR from 1-4. Otherwise the turbo would de spool. They just take so much exhaust for recirculation that it reduces the drive pressure to the point where there wouldn't be enough left to keep it spooled. Crazy!!!#@$%!