Question about 1989 Mercedes-Benz 190

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Mercedes benz 190e 1900year /air flow meter connections

My mb 190e 2.0 1990year with carburator version was converted to fuel injection abt 3yr back .
I am trying to figure out the terminal for the air flow meter
which reads as foll

unconnected rest postion
top connection 1 (assume as terminal14){ 14/17 reads
middle connecion 2(assume terminal 17) | 1050 ohms
bottom connection 3 (assume terninal 18) { 14/18 reads
4500ohms

when connected and engine running

connection 1/2 reads 1000ohms (assume 14/17
" 2/3 reads 5000ohms assume 17/18
" 1/3 reads 690ohms assume 14/18

question: If want to overides the 2 potentiometers in the
air flow meter which connections wires must I use ?

I want to manually control the potentiometers to make the
intake mixture more lean or more rich as am testing
with gas as a supplementary fuel

appreciate the comments

rdgs/larry quah/Malaysia
email: lqnetwork@pd.jaring.my or quah.larry@gmail.com

Posted by on

  • lqnetwork Aug 18, 2008

    THANKS VMUCH FOR THE ASSISTANCE. IN THIS
    PATICULAR CASE THERE IS NO LAMBADA SENSOR INSTALLED FOR THE ORIGINAL
    CARBURATOR SYSTEM. SO THIS IS NOT THE ISSUE. AM USING THE LATEST BOSCH 4 LEGGED HIGH PERFORMANCE SPARK PLUGS.

    I HV ALREADY TUNED THE AIR MIXTURE BODY
    ARM
    TO A RPM OF ABT 900/1000 IDLE. IT WAS
    AT SET BY MY MECHANIC ABT 1100/1300 LEVEL EARLIER N WILL BE
    HIGHER ONE THE ENGINE IS RUNNING ON LONG DRIVES. THIS IS MAINLY DUE TO THE
    RPM LOWERING WHEN AIRCON/ GEAR LOAD IS ON

    ONLY PROBLEM I SEE NOW AT THIS NEW SETTING WHEN IN COLD START IT WILL TAKE A BIT OF PERKING UP OF THE ENGINE BEFORE IT KICKS OFF. AFTER THAT ALL IS OK.

    YES AM USING HOD (HYDROGEN ON DEMAND) AS THE GAS ADDITIVE.

    AM ALSO USING THE GAS TO FEED ON THE BY PASS INTAKE BELOW THE AIR IN TAKE BODY
    THAT IS USED FOR THE PRESSURE INDICATER
    ECONOMY/HIGH ON THE MAIN CONSOLE.BESIDES THAT HV ALSO ANOTHER FEED THROUGH THE AIRFILTER ELEMENT USING AN INJECTION NEEDLE.
    THIS WAY THERE ARE 2 WAYS OF HOD FEEDING TO THE ENGINE.

    SO FAR SO GOOD I NOTICE ABT 30% GAIN ON THE LONG DRIVE BUT CANNOT BE CONSLUSIVE UNTIL FURTHER TESTING.

    THE ENGINE PICK UP HV IMPROVED N NO MORE
    PINKING ON LOW GEAR .

    WILL POST THE RESULTS LATER ONCE TESTING IS COMPLETED/ RDGS-LARRY QUAH/MALAYSIA


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Guys i just bought my first car and its a Mercedes 190E 1.8L 1991. Now i noticed an digital meter just above my steering wheel with 2 knobs on each end. I dont know what is it for can u tell me plzz. Thanks :>

Posted on Jul 13, 2009

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AS far as i understand it your air flow meter only controles your idle, not your air/fuel mixture. The mixture is controled by the Air/fuel mixture body that sits immidiatly below your fuel distributor. it has a 'tower' that reaches up to a hole in your aircleaner so you can get to it with an allenkey. To set the mixture correct it needs the aircleaner on. that screw changes the pivot point of the arm that gets depressed by the large round disk visual if the aircleaner is of. This is not a throttle butterfly, it mechanically 'measures' the airflow by being sucket down and pushing a plunger upwards into the fuel distributer increasing the amount of petrol to the injectors. You say gas as a supplement... I assume you mean Hydrogen Fuelcell. Because if your trying to 'add' instead of replacing with LPG or Natural Gas you will have a problem as LPG for example needs to ignite earlier. For example if the petrol engine fires at 6 deg BTC on petrol, than converted for LPG it needs to fire at 16 deg BTC on their original plugs (newer plugs are available that allow for an acceptable setting suitable for both fuels but all i everseen when petrol was still present when switching to LPG is an 'engine bay' fire)... But assuming your talking Hydrogen fuel cells as a supplement to try and reduce your fuel consumtion than the element that could create a problem for you is the Lamda probe (Oxygen sensor) in your exhaust as it may think that your fuel mixture is to lean and tries to increase fuel through the cold start injector or the electronic pressure regulator on the fuel distributer. I hope this will help you somewhat.

Posted on Aug 18, 2008

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