Harness wire E200

[Sobibor]

My E200 has been Mia behaving and mechanics have said it's the harness wire, it's the throttle actuator, it's the ECU. The vehicle just refuses to start sometimes no matter what you do. After u must have forgotten it, you may come back and try to start and it will start. It idle is very irregular and it's fuel consumption is so high. It also doesn't have power but when I throttle down and hold it for a while, it develops power only to loose it and start sputtering at about 4000rpm. Pls can somebody help me out.
I will also want to know the particular year it was built as my mechanic says he doesn't have the 16 pin connector to diagnose the vehicle. Pls how can I reset the ECU and get everything back to normal?

 

[carat 3.6]

Welcome to the forum, I'm guessing you have a e220? What year is it?

I'm willing to bet you need a new engine harness, they degrade and cause all sorts of faults. Your mechanic wont find the 16pin connector because it doesn't have one, these cars use flash codes.

 

[Sobibor]

I am not too sure as I don't know how to identify the year but I strongly think it was made in '92 or '93.
Pls explain the flash codes and how It can be of help to me.
Cheers.

 

[carat 3.6]

The age of the vehicle will be on the logbook. You need a flash code reader like this one: Diagnostic code reader tool for Mercedes W 124 201 300E 190E E320 300TE 300CE | eBay

 

[Sobibor]

Welcome to the forum, I'm guessing you have a e220? What year is it? I'm willing to bet you need a new engine harness, they degrade and cause all sorts of faults. Your mechanic wont find the 16pin connector because it doesn't have one, these cars use flash codes.

Thanks Carat. This forum has really Educated me. I bought the car not long ago and the previous owner had lost the manual and log book. I have learnt from this forum that it's a 1992 W124-M111.940 Engine with a model code of C124 E 20/2.
I have also learnt what flash codes are and since code readers are not sold around me, I will be making one myself Today and it will be fun using it.
I will be needing help with a fault code manual for my exact Engine as I haven't been able to find one online, pls any idea on a link to get such detail?

 

[Sobibor]

I got a new harness wire and my mechanic is saying that the wire isn't the same code with the ECU. He says the wire is a 018 wire while my ECU is a 015 ECU . I really want to understand it it will make the vehicle not to function properly. He said that the firing order will be wrong because of the wire.

 

[carat 3.6]

What exactly does your mechanic think is different between the new and old harness?

 

[Sobibor]

What exactly does your mechanic think is different between the new and old harness?

He is saying that there are more wires in the one I got therefore after fixing it, there still remain other loose wires not connected.
Something really plated out today when he got another ECU and fitted it to my vehicle, the car performed well, the actuator was opening and when the AC is on, the vehicle RPM adjust itself to normal and he now said I need a new ECU too.

 

[Sobibor]

He thinks there are more wires with loose ends after he has connected the Harness wire and the MAF sensor is different.
Something funny played out when he swapped my ECU with one from his shop. My vehicle seemed to perform fine and he now said I need a new ECU .