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Old 04-27-2021, 07:43 AM
amilian21 amilian21 is offline
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Join Date: Apr 2021
Posts: 5
1987 560SL Duty Cycle

My 17 year old son and I have been working on a 1987 560SL that we bought not running. We have been at it for almost a year. The car has not been running since 2004.

We basically replaced almost all the fuel system, timing chain, water pump, amongst several other parts and we have the correct fuel pressures and the car now starts and runs fine.

Although it takes a little while to start and seems to be running rich.

When I go take take the Duty Cycle with the ignition on and the car not running I'm getting 0 when it should be 70%.

Following the formula (duty cycle [%] = [1 - (Vp3 / Vp6)] * 100) the voltage at the X11 between 2 & 3 and 2 & 6, we are basically getting the same voltage on both. I also get same reading when the car is at idle.

If I use a meter with Duty Cycle I also get 0

I've been looking and looking and can't seem to find why. Does anybody know what it could possibly be the cause(s)?
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1987 560SL Duty Cycle-img_0629.jpg   1987 560SL Duty Cycle-img_0626.jpg  
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