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  #31  
Old 06-27-2004, 03:10 PM
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You know it is nearing the point that if you still have your EGR on that you may just as well leave it on because starting 2k5 we will start using ultra low sulfur diesel (ULSD) which won't create the soot or crud like the stuff we burn now does. My EGR will go back on once ULSD comes around because at that point it'd be silly to not put it back on. The only bad thing it could do then is raise intake temperatures but then again since it is nitrogen which is getting sent back through it can't raise EGTs anyway, if anything it'd lower EGTs.
====

Upon second thought I retract this comment, see my post later in this thread for an explanation. ULSD reduces emissions, not soot or at least significantly.
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Last edited by BoostnBenz; 07-23-2004 at 04:16 PM.
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  #32  
Old 06-28-2004, 04:14 AM
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So if I plug the vacuum line to the EGR, I might have reduced unburned fuel coming out of the tailpipe, particularly at idle, and decel? Am I understanding this correctly?

What if the EGR is so clogged that it isn't functioning anyway, will plugging the line help still?
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  #33  
Old 06-28-2004, 11:48 AM
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The EGR is off at idle, yes in a very minute way it may lower the amount of unburnt fuel but I wouldn't count on seeing a noticeable difference. If the EGR valve is functioning properly you can just plug the vacuum line and it won't work anymore, but if the spring in it is to weak it may be leaking all the time (not very common though). If it is so clogged it isn't working then it doesn't matter if you shut it off or not.
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  #34  
Old 06-29-2004, 01:38 PM
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Quote:
Originally posted by BoostnBenz
The EGR is off at idle, yes in a very minute way it may lower the amount of unburnt fuel but I wouldn't count on seeing a noticeable difference.
Diesel engines with electronic control allow for EGR at idle. There is a predefined duty cycle for it.
The PCM senses change in MAF readings and adjusts fuel and idle to compensate, if the EGR is blocked (not working) it sends a CEL for no EGR..

Early MB EGR systems had no electronic control.
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  #35  
Old 06-29-2004, 02:15 PM
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Yes I'm refering to the mechanically switched EGR systems.
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  #36  
Old 06-29-2004, 03:59 PM
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Put another way, the EGR is easy to disable on Mercedes diesels up to 1989. From 1990-up it takes a lot more work, thanks to the pesky computer.

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  #37  
Old 06-29-2004, 09:15 PM
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Quote:
Originally posted by BoostnBenz
You know it is nearing the point that if you still have your EGR on that you may just as well leave it on because starting 2k5 we will start using ultra low sulfur diesel (ULSD) which won't create the soot or crud like the stuff we burn now does. My EGR will go back on once ULSD comes around because at that point it'd be silly to not put it back on. The only bad thing it could do then is raise intake temperatures but then again since it is nitrogen which is getting sent back through it can't raise EGTs anyway, if anything it'd lower EGTs.
Just thought I'd add that if you live in Calif. and you're near a BP or Arco station that sells diesel, you can already buy ULSD. They have already switched all their diesel stations to ULSD, ahead of the regs. I'm in Calif., but none of my local BP/Arco stations sell diesel!
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  #38  
Old 06-29-2004, 11:11 PM
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Is it the complete ULSD or just the mix? It seems like modern day #2 has something like 500ppm of sulfur, the 2k7 requirement is 15ppm of sulfur but until then they were going to mix them to get it down gradually.
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  #39  
Old 06-30-2004, 04:00 AM
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As far as I know the egr computer reading (up to -95) only registers that the passage is open (unblocked). If, for test purposes, you close the exhaust port and put a filter on the egr stack it will just allow the vehicle a bit more fresh air at idle/cruise and run swimmingly.
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  #40  
Old 06-30-2004, 08:26 AM
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What happens when an egr valve malfunctions? Is that the same as it being blocked?

If I remove it, it appears that I would have to get rid of a bunch of soot build up in the manifold. I am a decent maintenance DIY guy, but just don't have the time to tackle something like this. A shop would probably be very resistant to something like this, right?
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  #41  
Old 06-30-2004, 11:29 AM
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Depends on how it malfunctions, if it sticks open you'll get excessive smoke at idle and it'll run a bit rougher. If it malfunctions in any other way then it'd be the same thing as off. Assuming the spring in it is good and it isn't stuck open if you block the vacuum line it'd be the same thing as plating it, but just having it on the car still for looks.

Well Alan I only pulled off the EGR on my 83 before, when doing so was apalled by the nasty crap in the neck where the EGR goes. However once I cleaned this out I could still see aluminum at the bottom of the intake manifold, so if it has managed to keep itself somewhat clean through all of this then it wasn't bad enough for me to consider taking off the car to clean. Who knows maybe it'll slowly clean itself out too.
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  #42  
Old 06-30-2004, 02:04 PM
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Quote:
Originally posted by BoostnBenz
Is it the complete ULSD or just the mix? It seems like modern day #2 has something like 500ppm of sulfur, the 2k7 requirement is 15ppm of sulfur but until then they were going to mix them to get it down gradually.
It is the real deal, the 15ppm stuff. Here is the BP press release:

http://www.bp.com/genericarticle.do?categoryId=120&contentId=2001592

Their brand name for the fuel is ECD-1. It also says the fuel is available via other retailers who buy diesel from BP, so if you know a station in CA that buys diesel from a BP refinery, you'll probably be getting the 15ppm stuff.
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  #43  
Old 06-30-2004, 02:28 PM
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A slight thread variation - sulpher ppm. When the new 15ppm kicks in universally then our oil changes go to what interval (estimated)?
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  #44  
Old 06-30-2004, 02:48 PM
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Well I guess the answer to that question is another question, how long does MB recommend the interval in europe?

Cost much more? I heard that it was only going to make it go up $.05/gal. I don't see them mention anything about additives. Unless something changed when removing sulfur they also remove the lubricity properties of diesel. I'll have to look into this sometime, find some more info on it.
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  #45  
Old 07-23-2004, 04:14 PM
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Quote:
Originally posted by BoostnBenz
You know it is nearing the point that if you still have your EGR on that you may just as well leave it on because starting 2k5 we will start using ultra low sulfur diesel (ULSD) which won't create the soot or crud like the stuff we burn now does. My EGR will go back on once ULSD comes around because at that point it'd be silly to not put it back on. The only bad thing it could do then is raise intake temperatures but then again since it is nitrogen which is getting sent back through it can't raise EGTs anyway, if anything it'd lower EGTs.
LIES all lies. I retract this comment after speaking with a professor at college about this. He had quite a valid point that soot is a result of burning aromatics, not really the burning of sulfur. For example an actylene torch creates large amounts of soot, how much sulfur is in it?! Probably none!
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