Carbonized diesel intake manifold
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milkman
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I'm confused, which ain't new, if the intake problem comes from the vapors coming out of the crankcase via the pcv, then how is changing the formula of the fuel that doesn't enter via the intake stop the crankcase vapors from gunking up the intake??? Does that much crap get past the rings????
SkyPup
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Simple, the EGR reroutes the sulfur contaminated exhaust (from the sulfur contaminated fuel) back into the intake tract to merge with the PCV to gunk up the EGR valve and downstream intake tract and intake valves. This is really bad when the engine is cold and the water vapor is highest in the exhaust and the PCV output, although once the engine heats up to operational temps it boils off the water and leaves the thick gunk residue of the sulfur-carbon matrix oozing with the oil residue from the PCV. Sulfur is water soluable and once the water evaporates, it leaves it concentrated onto the EGR and intake as seen in the posted photos of the contaminated EGR valve. Getting rid of the sulfur in diesel fuel in the USA, as in ULSD, immediately removes 95% of these particulate contaminates from the exhaust, thereby immediately removing 95% of the problems described in this thread.
milkman
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Got it now, so maybe when we get clean fuel they can do away with the EGR, sure hope we can get more choice of diesel vehicles here also.
Well, EGR is most likely here to stay untill they goto camless or variable cam timing to allow overlap. EGR displaces the oxygen in the combustion chamber reducing the heat created by combustion(kind of like ice cubes in your soda). NOx is created from combustion temps over 2500deg, so by cooling the combustion we can minimize the NOx. All part of the big picture. When the newer fuel comes out it will open many doors to the clean diesel market. We should see alot more diesels over the next few years. /forums/images/graemlins/grin.gif
jgh
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20050923
Ford dealer told me my 2005 diesel has EGR (for the first time?), and that I should not idle my engine too long to do a turbo cooldown. I have also noted an odd exhaust odor compared to other older diesels in my "fleet". Based on the N0x comments, that may be why.
P U! /forums/images/graemlins/frown.gif
J
Ford dealer told me my 2005 diesel has EGR (for the first time?), and that I should not idle my engine too long to do a turbo cooldown. I have also noted an odd exhaust odor compared to other older diesels in my "fleet". Based on the N0x comments, that may be why.
P U! /forums/images/graemlins/frown.gif
J
True, mostly....
Ford did have EGR on a couple of the early '80s diesels.
The 6.0L came out with EGR with its debute in '03. Your dealer is right, dont let it idle. Turbo cooldown should still be done, though not more than a couple of minutes after a hard workout. A diesel naturally runs cool at idle, when you add EGR it runs even cooler combustion temps. Depending on the calibration, Ford has tried using the EGR at idle to quiet the engine. They are finding that the noise is better than the side effects. Currently, the latest calibrations shut the EGR durring extended idles.
They do smell different, I believe it is due to the total package design turbo,combustion chamber and EGR are all definatly a part of that.
Another thing to remeber with your 6.0L, dont do short runs if you can help it. Sinse the turbo is a variable design, if you dont get it completely warmed to dry out any condensation, it can stick. The folks that dont do this and just move the truck from time to time to mow the grass or get to something behind it have noticed repeated turbo failure due to rust build up.
Ford did have EGR on a couple of the early '80s diesels.
The 6.0L came out with EGR with its debute in '03. Your dealer is right, dont let it idle. Turbo cooldown should still be done, though not more than a couple of minutes after a hard workout. A diesel naturally runs cool at idle, when you add EGR it runs even cooler combustion temps. Depending on the calibration, Ford has tried using the EGR at idle to quiet the engine. They are finding that the noise is better than the side effects. Currently, the latest calibrations shut the EGR durring extended idles.
They do smell different, I believe it is due to the total package design turbo,combustion chamber and EGR are all definatly a part of that.
Another thing to remeber with your 6.0L, dont do short runs if you can help it. Sinse the turbo is a variable design, if you dont get it completely warmed to dry out any condensation, it can stick. The folks that dont do this and just move the truck from time to time to mow the grass or get to something behind it have noticed repeated turbo failure due to rust build up.
jgh
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20050928
Thanks, I always try to avoid non-full-warmup runs with all my vehicles.
What did you mean when you say the "latest calibrations" shut the EGR down--is that something Ford did, and can I find out if mine has it (build date was either Dec or Jan year past).
Jim
Thanks, I always try to avoid non-full-warmup runs with all my vehicles.
What did you mean when you say the "latest calibrations" shut the EGR down--is that something Ford did, and can I find out if mine has it (build date was either Dec or Jan year past).
Jim
Yes, if you are having any issue with the truck the dealer will recalibrate the processor to the latest calibration. However, if things are ok, leave it alone. More than likely your driving habits are not causing any of these issues. Good luck with it, I do recomend using a good dealer, these things are much more sophisticated than you would think. Independant shops arent ready for them.