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#1
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HELP: 190E air-flow meter potentiometer worn...
Hello all,
On both of my high mileage 190E-s 2.3 4V and 16V (both 1986) the potentiometer measuring the air flow (on the side of the chamber just below the air filter) is worn: reading are very erratic. Can someone tell me what the purpose of these sensors is: (1) Do they work to compensate for air/fuel mixture when accelerator pedal is suddenly depressed? (2) Also, how much benefit in peformance/ driveability can I expect after spending $600+ to replace the assembly. After serveral inquiries I understand that the potentiometer only is not available; one needs to buy the whole housing and that is why it costs so much. (3) Is there an after-market replacement for the sensor only? Or, is there a shop that would do it? Any info greatly appreciated. TIA, Tony Ander PS: Any sources in Germany??? I will be there for a week later this month... |
#2
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Works all of the time! reporting info to computer of the "air flow position". This helps the computer to richen the mixture durning acceleration & leaning the mixture for emissions all of the rest of the time.
Will cause IDLE & acceleration problems! Replacement WON'T help the engine to produce more HP at all. MB part number is 000-074-23-14. Bosch number is 0 438 121 044. I would replace the rubber pleminum boot that mounts to it as well, MB number 103-141-00-90
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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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Thanks MBDoc!
Thanks so much for the quick reply as
well as the part numbers. May I follow up with some more questions: Can you please check the part no. for the same air flow sensor for my other car, which is also a 1986 but 4V 2.3L 190E. By replacing the part I would expect better engine response, is this correct (no, no HP increase, I realize.) Also, could you recommend a Bosch outfit for these parts? I am really shocked and reluctant to pay so much money for such to replace the whole assembly, when only a "small" part is worn. Again, thanks so much for your help! Really great forum and members. Tony Ander aander@newsignal.com |
#4
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On the 1986 car you can replace JUST the sensor! MB part number 000-074-01-36. Easy to replace but can be a job to calibrate to fuel system.
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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 |
#5
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Thanks MBDoc, here are the pn-s I found...
Thanks MBDoc,
For everyones benefit (I hope) here are the numbers I found by actually reading them off the parts in-situ: 1986 190E 2.3 - 16 ----------------------------- pn. of intake assembly (with the flap and potentiometer on the side) Bosch 0438 121 044 pn for potentiometer only (black plastic enclosure) 3 430 591 017 1986 190E 2.3 - 8 valve ----------------------------- pn. of intake assembly Bosch 0438 121 010 pn for potentiometer only (black plastic enclosure) 3 430 591 031 =============== MBDoc, how hard it is to calibrate this thing? Wouldn't it just be a matter of measuring closed and open potentiometer readings and adjusting the potentiometer position on the side of the housing? Is anyone out there doing this? It should be a common problem with high-mileage cars, as these thnings wear out, so, I would think there is a market (need) for this service. It sure would beat the $600 for a new assembly... Thanks to all for a great site!!! Tony Ander aander@newsignal.com |
#6
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I have a similar problem on my 1987 190E 2.3, with only 28,000 miles. Car sat for several years while my wife was ill, and has been a problem ever since. Spent about $1,200 to have the dealer drain the rotten gas and replace lots of parts/filters, etc. Earlier this year the head gasket blew, and paid the dealer $3,100 for that repair, just to have no acceleration about 2 weeks ago, and the dealer referred me to a muffler shop to get the clogged "Cats" replaced. Did that, and while much better, still have bogging down if I floor the accelerator. Hard to get up to freeway speeds quickly. Now appears the Mass Airflow Sensor may be the culprit. On this model it appears I can replace the Airflow Meter Potentiometer to correct that problem. I have ordered one, and wondering if I should look for some other issue. I have already replaced the fuel pump, check valve, accumulator, and fuel pump filter, and rebuilt the fuel distributor some time ago. I have tried several mechanics to get this car back into good condition, but with each try, it seems something else goes wrong. Will appreciate any advice.
Thanks, Tom Bell tombell3@ix.netcom.com |
#7
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potentiomiter
You can replace them but will need setting up after doing so.
To learn how to and know more about it read this ,. Go to Google search in the box put this- Bosch CIS-E AirFlow Service Potentiometer Replacment and Adjustment |
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