High CO

Hi D jet familyI cannot adjust the carbon setting in my Mercedes W114 280E.  When you hold down the gas while the carbon is 4, the exhaust emission increases to 6.  It rises instead of falling.  What could be the reason for this?  I tried to adjust it from the brain but I couldn't. Adjustment button came to the end. Still carbon 4%. Pressure sensor idle vacuum value -0.6 bar. What is problem?Thanks.

Hi Unknown,

can you change CO value by rheostat on ECU ?

Hi dr volker, how are you? My name is kerim from hatay turkei )
No, I can't change with ecu.because the adjusting screw is at the last point.Auxiliary air valve stuck open Could it be from it?
Thanks

Merhabe Kerim,

how did you survive earthquake in Hatay? I had asked for you in February. My friend's home is demolished and he lost many friends and relatives.

Open AAV does not influence CO directly. It influences rpm. Can you increase CO by ECU rheostat? So does CO change at all it you turn it?

Thank you Doctor Walker our house is damaged. However, we did not have any casualties. Thank you for your interest. When I change the ecu, the carbon increases. In other words, the Eco function is correct, but the carbon does not go down 4.5% even though I come to the end of the adjustment. Also, when I press the gas at 2000 rpm with the exhaust meter installed, the carbon increases from 4.5 to 6 when I press the gas on the contrary. Normally, it should decrease. I changed the distributor yesterday, could it be because of that? Or could it be the green wire from the distributor to the ignition computer?
Thanks for answer.

Merhaba Kerim,

well good to hear that you had no casualities in your family.

A totally wrong igntion timing can cause higher CO. But problems with MAP sensor and with engine temperature sensor and wiring is more common. What is the stamp in the 0 280 100 111 MAP sensors top right rivet?

The map sensor is the correct number. However, I played very little with the 4 hex set screws at the top. Also I changed distributor yesterday. Could this be related?
Thanks.

Hi Kerim,

you detuned MAP sensor and now Ypu ask my advice

You are on your own with that now. Get yourself another unmanipulated one.

(....After all, it doesn't even have a black protection cover on it. I've owned this vehicle for 2 years. How many times has it been tampered with by the masters over the years? We don't know... Would the green wire from the distributor to the ignition computer cause this CO rise issue?

Hi Kerim,

please follow my advice. It is serious and not just a joke.

Green cable problems make ignition fail completely.

Thanks dr. Volker
ok I agree with your advice. Do you have a solid map sensor? I can buy it from you.
Thanks

Merhaba Kerim,

sana Özel Mesaji gönderdim am cevap vermedin. Dostum 5 gün sonra Hataya gidecek. Sana bu MPS lazim olursan bana hemen haber ver.

Hi dr.volker
Yes, Mr. Selim will come, I guess I need a pressure sensor. I would be very happy if you send it.
Thanks for all.

Hi Kerim,

You decided very late. I will send it with him if I can still give it to hom as he travels tomorrow.

Hi dr volker
Sorry.I saw the message yesterday as the mailbox was full and I replied to you immediately. I would be grateful if you could send it.
Thanks for all.