W124 M119 Lambda Control Inoperative?

[kristian85]

Mates,

What the heck is the Lambda Controller, anyway? Where is it? This is the error code I get--I can't find anything about this Lambda controller anywhere. I have an oscillating idle and that error code; engine FI harness and ETA have been redone.

Thanks,

Kristian

[cliffmac]

screw the Lamda term...it's an O2 sensor....Lamda is a fancy name for an O2...bullcrap.....nothing more..the Swedes made it up and where are they now?

[macdrone]

I second that its the O2 sensor. What year and type mercedes?

[Arthur Dalton]

Originally Posted by cliffmac

screw the Lamda term...it's an O2 sensor....Lamda is a fancy name for an O2...bullcrap.....nothing more..the Swedes made it up and where are they now?

You sure don't do any homework...your post couldn't be more wrong.

Lamda is an AFM measure and 1 Lamda is = to an AFM of 14.7:1 mass.
Just like 14.695 PSI is =to 1 ATM.
They are Engineering measures.

An 02 sensor is simply an Exhaust Oxygen content measureing sensor ..and that sensors signal, [ in Voltage] simply supplies the input signal to a Lambda AFM Controller. The 02 does not change the AFM, the Controller does.
So, it is a Lamda /Closed Loop system, where the Controller attempts to maintain Lamda [ 14.7 Stoich A/F mixture], using exhaust 02 content measures .
Lamda is not a 'Fancy Swedish" term for an 02 sensor...and your confusion is b/c a Lamda "Sensor " is an 02 sensor, only b/c it is part of a Lamda controlled system.
And a Lamda Controller is NOT an 02 sensor..it is just what it says it is ..a Lamda Controller.

[Arthur Dalton]

[QUOTE=kristian85;2243187]Mates,

What the heck is the Lambda Controller, anyway? Where is it? This is the error code I get--I can't find anything about this Lambda controller anywhere. I have an oscillating idle and that error code; engine FI harness and ETA have been redone >>

Well, I don't know if you have a "92 E400....or maybe a "95 420E , etc., or what..??
Model/yr.

So , I will just take a stab at it being the former.

That info suggest my first suspects would be a vac leak or a ruptured fuel presure regulator diaphragm.

Look for vac hose leaks and then with car @ idle , take the vac hose off the FP reg and see if any petro comes out that vac port..if YES, replace the FP reg, as it is allowing un-metered fuel into the intake, causing your osc idle..just as a vac leak will do..
The Lamda Control system can't do it's job correctly with either condition.

http://catalog.peachparts.com/ShopByVehicle.epc?q=1992-Mercedes--Benz-400e-Fuel--Injection&yearid=1992%40%401992&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6258%3AMBC%7C1530%3AED%7C10000072%40%40400E&catid=240621%40%40Fuel+Injection&subcatid=240645@@Fuel+Pressure+Regulator&mode=PA

[kristian85]

Thanks, Dalton--yours is the reply I was looking for! I suspected Lambda related to stoichiometry. It's a '95 E420. Also has recent caps, rotors, wires, and plugs.

Which vacuum hoses are suspect? I replaced the thin clear one between ignition advance module and the intake manifold when reinstalling the ETA; it was very brittle.

Where is the FP regulator in this car?

Thanks again--

[Arthur Dalton]

ALL and ANY..

You see the pic I posted ..that is the Reg. Look at the engine.
Your vac leak could even be the vac hose going to the regulator.

Archieves has all that kind of info.........