MAP sensor number

Hello Dr. DJet,

I have found on my MB 250 CE 1970 a MAP sensor, that looks to work well, with a number 0280100012, since correct number is 028010006 according to the table.
I have some problems with CO parameters, in idle run and in every speed.
Can you tell me if by tuning this MAP I can achieve parameters for my car?, Otherwise, can you provide, or help me find, the correct MAP for my MB 250 CE 1970?

Hope I can find the help I need, best regards,

José Fuentes
from Chile

Hi José,

and welcome to this forum from Chile. I must admit that I do not know much about Chile other that you have good red wines in recent years.

Regarding your MAP sensor there is no chance to tune it accordingly. In idle-run they are very similiar but the 012 makes a much richer mixture in part-load and full-load- its curve has a totally different slope.

I will check my stock again for the 025 MAP sensor. Before you buy any: Make sure it still has original potting, keeps vacuum (diaphragms tear very often) and has never been opened.

Hello Volker,

In deed, we have realy good red a white wines in Chile, also a good price/quality rate.

Thank you for that fast response, and I will be waiting for your new stock search.

You should consider my MAP N° 0280100012 in any deal we can achieve, It is as original, never opened and never intervened, seal for tuning screw looks quite original. I follow your instructions and the MAP holds pressure and primary and secondary windings are according to test expectation.

Best regards,
José Fuentes
Chile

Hello José,

I knew I had one 0 280 100 025 for 250CE, I just could not find it in my chaotic stock. Time to activate my stock management list

Now I opened all drawers again an there finally in the last corner it was. I also checked whether it holds vacuum and yes, it does! I will do a test bench verification tomorrow evening. And if it is okay, you can have it. However I am afraid of customs and transportation issues. Customs in Germany is a nightmare. They charge at least 19% VAT for everything above 22€ plus VAT on transport. And if you cannot prove the real value by an official bank transfer, Paypal etc. they estimate a high value and make you pay VAT for that.

Hopefully Chile customs is not as bad.

Hello Volker,

What a good news, I hope it will run Ok.

Regards,
José Fuentes

Hi José,

now I have tested it and it is 100% okay. I will contact you via PM, I have to check how much transport to Chile is.

Hi Volker,

We are still Ok, that´s good.
Don´t forget my MAP.

Best regards,
José Fuentes

Hi José,

normally I would swap MAP sensors with you. But unfortunately importation from outside EU is a huge problem with customs. They would hold the package, ask for an invoice, might not believe it and estimate a value and charge 19% VAT (plus possible customs fees) on that estimated value. I am therefore not saying yes to a swap. Would you take the risk that customs Germany has a look into eBay and finds a fantasy price of 400€ sales plus 50€ transportation for a MAP sensor and charges 100€ VAT ? I cannot take that risk. Within the EU it would not be a problem. I would ask you to send your MAP sensor and verify it and then find a solution with you that would fit us both.

I believe it is better if you sell it to someone in the Americas. US customs e.g. seems to be much more relaxed with such imports. I am sorry not to have better news on that.

Hi Volker,

Thamk you for your careness, I understand your explanation, let me see what to do with my 0280 100 012 MAPs, in the meantime, I am waiting for your PM as well.

On the other hand, a friend of my has also a MB 250 CE and he found his MAP, with correct number 0280 100 025 could not retain vacuum at all, he told me he opened and found the diagram broken, and ask me to find a solution, do you have diagrams available for this MAP? ( my friend doesn´t speak english at all)

Best regards,
José Fuentes

Hi José,

I had sent you a PM already. Did you get that? Regarding your friend: Torn diaphragms are unfortunately normal on type 2 MAP sensors. But replacing them will hopefully make your car work for another 30 to 40 years. I am currently working on building diaphragms myself. I now have the copper foil ready and work to have the holder for adjustment screws on it. Once that is completed, I am ready. So far I got some for 150 USD plus transport. I work to bring that cost down by producing them myself.

However it makes no sense for your friend to just replace the diaphragm. Afterwards you need to adjust part-load, full-load transition and full-load stop screws to references. So even when I have my own diaphragms ready I will not sell them. It simply makes no sense. Bosch of course also offers to refurbish broken MAP sensors.

BTW: If you ever come to European Union or have a friend coming here, it is then no problem to send it to me. I would verify it and then I can grant you some money back.

Hi Volker,

Thank´s for that fast replay, I haven´t recieved the e-mail yet, maybe you have a bad address, I send you a new e-mail to make you able to check my address.

Let me talk to my friend and see what happens.

Best regards,
José Fuentes