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Old 07-28-2004, 12:32 AM
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Join Date: Jul 2004
Posts: 30
No pin #3 on my X11

Okay, folks try this one on. I have a European 1985 280sl. The best I can tell, it is K-Jetronic fuel injection. I wanted to adjust the mixture and test the lambda control unit. Well, guess what? I have the X11 test connector on my car, but I couldn't get any readings at all. On closer observation, I realized that there is no electrical contact all in the #3 pin. It is just plastic down there, whereas the other ones have an electrical contact and I can get some sort of reading. What is going on here? Is there a way to hook in some place else to get a duty cycle reading? Maybe on one of the wires to the frequency valve? How do I go about checking the operation of my lambda control unit? The O2 sensor was unhooked when I got the car. I replaced it with a new one and it seems to make no difference whether or not is it hooked or not on how the car runs. I have a rough idle, and it is too rich at idle to the point where I can't run the a/c. I don't think there are any vac. leaks.

Thanks in advance.

Glenn Swartzfager

Last edited by gswartzfager; 07-28-2004 at 08:22 AM.
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Old 07-28-2004, 02:53 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
The frequency valve and O2 sensor were added as part of the US conversion, so they probably didnt bother to run the wire to the diagnostic socket.

There are probably two wires going the the frequency valve. You should be able to test the on/off ratio on the non-ground one.
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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