Learning as much as I can about the 88 560 SL fuel injection system and I have some questions for the experts. I have a annoying miss at idle, cold and hot. Runs fine at speed but once stopped at a light, the engine starts to miss after 5-6 seconds. Stumbles upon acceleration for about 1 second and then runs fine.
I will check the following. All vacuum lines. fuel filters ( car sat for a couple of months). Injectors for spray pattern and missing, and all wires. The physical stuff prior to getting into the CIS-E system.
But It's time to learn about the CIS-E system.

I have read the service manual for the M117.96 engine. As well as read quite a few links to articles on the X11 terminal and how to use it. Here are the following questions.

First, I have read Steve's article

http://www.peachparts.com/Wikka/EngineControls

and

http://www.landiss.com/mixture.htm

and

'86 300E rich mixture - Duty cycle help

By using the Sears MM ( which I must purchase) in the duty cycle mode I should get a reading of the lambda value.
The Service Manual for the V-8 engines M116.96, M117.96 Job 07.3.077-124 page 4 discusses
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"c) with fault diagnosis by measuring on/off ratio.

Effective 12/85, faulty input signals are detected by the CIS-E control unit (N3) and passed to the lambda test output. The faults detected can be output with the lambda control tester (012) at the diagnosis socket (x11)."
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Then on page 07.3.0711-121 pg 16 the manual shows the On/off ratio in % ranges for the "what I assume to be" ( it did not really specify since it had the tech connect the Bosch test unit) the X11 pin 3 readout on the Sears MM.

They show a reading of

0% no voltage or ground ----

10% air flow sensor potentiometer wrongly connected---

20% Full load contact wrongly connected or faulty---

30% short circuit or open circuit---

40% ---

50% O2 sensor not operating or faulty. Open circuit

etc
etc

I'm confused with this info in the manual and Steve's article on adjusting the lambda. and determining any faulty components
In his article he uses his equipment in the duty cycle mode on pin #3 at the X11 terminal.
If the manual specifies all those values how do you determine a faulty unit in the CIS-E system as per the manual.
If I connect the Sears MM and get a 10% reading Then by the manual I should have a Air flow sensor problem.

How does this work. Am I reading the manual correctly?
Is the manual page 16 not for the X11 #3 pin or am I looking at this incorrectly.
Can I determine faulty components of the system by using the X11 #3 pin and the Sears MM.
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Second.

To trouble shoot the entire system the manual goes into connecting a pin access board to the N3 connector under the floor board in the 560SL.
By measuring voltage or ohms or amps of various pins you can determine the condition of the various parts on the CIS-E system.
Is this normally how it is done? Can you access the pins under the floor board, without the service manual equipment, or should I test the components another way.
This is located the the same manual 07.-.0711-121 page 20

Thanks all

Dave

__________________
1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car