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#1
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X11 reading 90 420SEL
Ok I have not had a reading of 2&3 That has any movement when I put my digital meter on percent, IE the reading is a constant 50.2% to 50.3% from cold to hot or warmed up to operating temp. It had a check eng. lite so I put a new ox sender in and have no fluxuation in the test reading as normal. can some one direct me toward likely reasons? thanks.
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#2
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Is the car a California version? Blink pushbutton & red LED on the diagnostic connector?
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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California car not
no it is not ca. car. the Duty cycle reading that I have had in the past has always had a fluxuasion when I check it and set it around 49% bounces from that to 51% some times higher. but after this ox sensor, it is riveted to a fixed number. thanks memory
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#4
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Maybe the new sensor is not hooked up right? Unplug it an see if there is a change. Mine fluctuates greatly, but I read it just as voltage, then add then up and divide by two.
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1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#5
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I had this same problem with my 300E. The engine ECU failed in such a way that the car was always in "open loop", thus operating at a fixed duty cycle value all the time and never entering "closed loop".
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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg 1991 300E - 212K and rising fast... |
#6
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duty cycle
I suspect this to be a proublem with the ECU, though I was looking for more morral support. I thought Doc had this one but I am slow to respond to the MB forum with every thing else going on at the present time. I do thank you for the pennies, and I hope you are having good luck with your ride. Memory you know I just rememberd that after working on my wifes dd a 91 190E 2.6 I used her old ox sensor and put it in to the 420 could this be the trouble are they unit specific? the 420 had a cel and it stopped after replacing with other ox.could this be the reason for the open loop?
Last edited by just-n-time; 09-02-2011 at 09:51 AM. |
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