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#1
11-30-2005, 07:36 PM
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83sd rough idle, fuel starvation?????
Ok recently ive been noticing when i start the car it will idle really rough and sometimes shut down and ill have to start it and rev it and slowly decrease to keep it from shutting off. then i have to keep reving it every 10 seconds after that until the rough idiling goes away. swapped fuel filter. been running on a 50/50 mix of diesel and veggie oil and i clean my oil really well with a 1 week settle and salt process to remove the water. then pre filter with a 10 micron filter and final filter down to 1 micron. been running 50/50 because of colder weather now and when i was driving the other day it wouldtn want to go faster than 45mph it felt like it was starving! so thats why i changed the fuel filters and saw a difference when i started off again went up to 80 or higher as usual but after a while it went back to 45mph!!
help please going on a trip soon with this car cant have this happening!!! 
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#2
11-30-2005, 08:48 PM
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From what you have posted I would guess that you had some "stuff" in your tank/system and the veggie oil is cleaning it out. Carry an extra "clear" filter to change and just back flush the old one instead of throwing it away. Carry a phillips screwdriver to change it with. You should be OK and this problem will go away when you get all the stuff out.
__________________
1977 300D Lost coolant while someone else was driving 1983 300D Can't run without oil 1985 300SD (gone but not forgotten) 1990 300TE 4matic Sold 1991 Yamaha Venture 1975 Kawsaki 250 triple 1974 Honda 200CL 1951 8N Ford 2008 Wildfire 650C
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#3
11-30-2005, 09:40 PM
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well ive have been running the car on veggie for at least 6 months now not sure exactly how many miles because the odo dont really work. and the previous owner worked at a bio-d plant and ran the car on b100 and veggie oil. he had a homemade kit installed in the car similar to greasel. so it cant really be that the gunk is clearing out can it??
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#4
11-30-2005, 10:12 PM
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sure it can. Different tanks have diffrerent fuel sources(different build up). If he changed the filter and it went back to normal, then his filter is getting clogged. It seems like the source is either the tank or the oil. What temp is your stored oil? What temp is it where you are? if there is a significant change then somehting might be getting hard enough to clog i.e. chicken fat. When you change your filter, what does the fuel you pour out look like?
__________________
1998 E320 150,000 1980 300SD 240,000 1965 190D 79,000
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#5
11-30-2005, 10:14 PM
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__________________
1998 E320 150,000 1980 300SD 240,000 1965 190D 79,000
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#6
11-30-2005, 10:41 PM
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defently no chicken fat in my oil. i use baking soda to drag that down to the bottom if i have any. here is a picture of the one time i did get chicken fat but i only used the top part after i used baking soda to make sure it was all out of the usable oil.
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#7
12-01-2005, 01:10 PM
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Your fuel tank screen may be clogged. See if you're getting sufficient fuel to the prefilter when you're having the rough idle. Though I don't have any direct experience with VO, I have read about cases where a VO/diesel mix coated the entire fuel system with wax.
__________________
2004 VW Jetta TDI (manual) Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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#8
12-01-2005, 03:45 PM
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greasybenz, can you explain the baking soda trick? i have one barrel that has been filtered hot, and the fat is slightly visible in the oil. the only time it was visible was when it was 30* outside, but even then it still was totally liquid. it is hard to see the fat, you have to look real hard at it up close to notice.
how much baking soda do you use? should i use for 55 gallons. also do you stir it?
__________________
 Grey '91 350SDL 214k Dad's car Beige '81 240D 4 Speed 254k SOLD Blue '82 300D 225k SOLD White '95 E300D 46k SOLD Blue '87 190D 2.5 Turbo 315k SOLD Brown '80 240D 4 Speed 716k SOLD Beige '80 300D N/A 119k SOLD Blue '85 300D Model 186k T-Boned
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#9
12-01-2005, 04:08 PM
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if you have a 55 gal barrel go pick up a submersible aquarium heater 300w would be a good one and just put the temp to the highest level, and just put it inside the barrel if its plastic make sure the heater doesnt touch the plastic because it might melt it.
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#10
12-01-2005, 04:17 PM
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#11
12-01-2005, 05:30 PM
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I said based on what you posted that seemed to be the problem. You do have something in the fuel that your car doesn't like and without looking at it I still would stand by this fact.
__________________
1977 300D Lost coolant while someone else was driving 1983 300D Can't run without oil 1985 300SD (gone but not forgotten) 1990 300TE 4matic Sold 1991 Yamaha Venture 1975 Kawsaki 250 triple 1974 Honda 200CL 1951 8N Ford 2008 Wildfire 650C
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#12
12-01-2005, 10:11 PM
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#13
12-01-2005, 10:23 PM
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I presume your car runs normally on straight diesel?
I would switch back to straight, see if the problem corrects itself, and then go from there. If the problem is still there...we have other problems 
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#14
12-01-2005, 10:28 PM
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If it doesn't run on straight diesel I think he toasted the IP either through Cavitation ( from water content) or salt content
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#15
12-01-2005, 10:46 PM
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