using the sears craftsman multimeter that has the option "FREQ % duty", I placed positive lead on pin 3 and negative lead on pin 2 of x11. This week, I replaced oxygen sensor and fuel filter. I tested the x11 with all connections plugged in. Car is '85 190E 2.3 8v.

the reading in the multimeter was moving up and down with a minimum of around .790 and maximum of around .990

does this sound too bad ???? thanks !

ivanlee that sounds perfect, I spent almost two years trying to see that voltage vary that well on my 85 190E, you should be happy

btw, what was the average reading while ideling? It could tell you a lot.

xp

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1985 190E 2.3L - a constant project.

Ivanlee,

If you have a meter that reads duty cycle, you should be sure to set it on duty cycle, not voltage.

The ideal reading is about 50%. If you are reading duty cycle and seeing from 79.9% to 99.9% you need to make lambda adjustments.

At least these are the proper readings for the late 80's/early '90's 300E.

Perhaps the '85 190E is different?

Yes, on that meter, you select the frequency selection with the rotary switch then press the % button. If you see the % sign in the LCD scale, then you're reading duty cycle.

Have a great day,

OK cool I didn't know that I had to press the % button after selecting the FREQ duty option.

So I went to do that a few minutes ago and...

Selecting the FREQ % duty and then pressing the % button, the outcome was minimum of around 59 and maximum of around 81 for an average of 70 % too lean. I will try to get it closer to 50%

How is gas mileage with mixture at 70% ???? What do you think ??? thanks !!

Go to the following site:

www.landiss.com/mixture.htm

Print it out and study it. Run the tests and let us know if you have any questions.

Duke

I got a MM that does Duty cycle, but I can never get a reading from my car, it is an 85, and I was under the impression that duty cycle came in a year or two later, cars from 85 are still on KE-II and starting with KE-III you get Duty cycle readings. I do get the voltage reading and it is propper right now.

Can anyone confirm this? Or is my MM just not working right, I don't have a % button on it, just a switch to Duty cycle.

xp

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1985 190E 2.3L - a constant project.

i talked to bosch tech support about this awhile back. here's what he told me-the cars is warm and the o2 is switching back and forth. unplug the o2, let the car stabilize, then check the voltage at pin 3. once you get a steady reading, plug the o2 back in, stabilize again, check 3 again. the voltage should match, if not adjust the mixture SLOWLY AND FINELY, always, after every adjustment, blip the throttle wide open and let the car stabilize. go slow and don't adjust too much. this applies only to 84-86 201s with the 102 motor. also the 84-85 bmw 318s. good luck, chuck

This all works for the voltage yes, I agree completely and that's how I adjust my lambda, but am I right when I say that KE-II does not give duty cycle readings? and KE-II is what an 85 190E would have?

xp

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1985 190E 2.3L - a constant project.

Well, when you put your meter on duty cycle and check pin 3/2, what does it say?

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2012 E350
2006 Callaway SC560

It is my impression they all have a duty cycle reading. The only thing they might not have is fixed duty-cycle fault codes. The duty cycle on the pin #3 goes all the way back to K-jet w/lambda cars starting in 1980. Also some later KE cars require turning on diagnostics with the diagnostic connection on the right side before a duty cycle can be read.

I do NOT like the concept of looking at this with voltage as this only works as a ratio of voltage read to battery voltage thus 6v might be 50% one time and 7v be 50% another depending on battery voltage.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician