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  #1  
Old 02-11-2008, 12:34 PM
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Location: Arlington, Texas
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R17 VS N3 Fuel Inj Computer

Ref: 1986 500 SL

Can anyone explain the relationship between the fuel injection computer (n3) and the 7 positon resistor (R17). I cannot find anything on setting R17 to different resistor values and the effect it has on the computer N3.

Thanks

MAGV5
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Old 02-12-2008, 02:27 PM
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I don't think there is a connection. Doesn't the resistor change the timing advance, so only affects the ignition module?
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 02-13-2008, 01:36 PM
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Thanks for the reply.
No you are thinking of R16 Which controls the timing map for the ELZ ignition module. R17 is located next to N3 and I think has something to do with the control of the fuel injection and electrohydraulic actuator(Y1). I cannot find any information on it. It has seven resistors on a rotory plug like R16. This is a european version, and I think R17 is a single resistor on the USA version. It shows in the wiring diagram, but not as a rotorery option.
Any ideas?

Magv5
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Old 02-13-2008, 08:51 PM
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Well, then you're 'way ahead of me on this one. I will ask our local indie euro specialist, JCP Motorsports, about it.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #5  
Old 02-14-2008, 09:15 AM
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Chuck,

I may not be ahead of you on this. What I have written is just what I think from looking at the cars wiring and the schematic. R17 most likely is used to "trim" the fuel injection computer, but that is just my best guess. If it is I would like to know how to trim it. I am certainly not an expert and could easily be wrong. I do appreciate your offer to ask an expert.

Curtis
MAGV5
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