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  #1  
Old 04-16-2003, 03:23 PM
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Join Date: Oct 2002
Location: Colorado Springs
Posts: 481
Question Duty Cycle

What is the recommended duty cycle for a 1991 560 SEL. I have mine set to 50%. However I have a hesistation on excelleration from a stop. Somewhat dangerous crossing a road. It started happening the day after I took it in to the shop to be adjusted and gases measured after I replaced my injectors. Is it to lean?
thanks
m

By the way before the adjustment at the shop she was set to a 70% Duty cycle. The car is at 6000 feet should I set it back or is there something else I am missing.
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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)

Last edited by mhingram; 04-16-2003 at 09:29 PM.
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  #2  
Old 04-17-2003, 11:04 PM
ILUVMILS's Avatar
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It should oscillate by about 10% (e.g. 45-55% ) when the engine is warmed up. If it's at a fixed reading of 50% at operating temperature you may have a bad O2 sensor. An oscillating reading of approx. 70% reading indicates a slightly lean mixture, but still within the acceptable range. Does it oscillate?
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  #3  
Old 04-18-2003, 01:21 AM
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weird

When set to 50% it really does not oscillate at all, but when set to 70 it actually fluctuates alot from 60's to 80's. The guys at the indy shop said a 70% was rich not lean?
I also am putting a new chain in in the morning as I have 10 degrees of stretch.
m
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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)
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  #4  
Old 04-19-2003, 06:00 PM
ILUVMILS's Avatar
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Talking

70% is rich compared to 90%, but it's leaner than 50%!
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