engine shut off on drive

Hi David,

I am currently on Retroclassics fare in Nürnberg. So just a short reply: You can measure vacuum on the line to MAP sensor via a T-piece. You can also measure vacuum leakage of your MAP sensor according to video in chapter 4 of my D-Jetronic compendium.

Hi Volker and all, happy new year!
Volker, i have measured my MAP-sensor.
I have aprox 92 OHM and 319 OHM on the coils. The ground isn´t present, so far so good.
But, i can hardly pull 0.5 bar and it fall to 0.45 bar in 2 - 3 seconds. So it it is far from ok, i think i have a leakage in the MAP-sensor. What do you think? When i put my finger direct to the pump, it is easy to pull vacum, the pump is ok then.
The number, put on the sensor is: 0 280 100 012.
What do you think? Can it be repaired or exchanged?

Regards David

Hi David,

the typical failure of this MAP sensor. It is a broken diaphragm and can be repaired by replacing diaphragm , retuning and resealing it.

Hi Volker
Even that I said that the pump was ok, I thought that I might try it once more, late yesterday.
Suddenly, I can pull vacuum with my finger, put against the pump, but the needle drops. The pump is brand new but obviously, not ok any more. I cannot in any case make the needle stay. I did manage to do that some days before. Must be an inner leakage in the pump. I cannot trust it.

So, I have to arrange for another pump and try again.
But still, if it is a broken diaphragm in the end, can you replace the diaphragm, retune and reseal it.
And if, what does it cost?

Thanks and regards
David

Hi David,
open the pump and apply some silicone grease to the cylinder.
That will work and is less work than to bring the pump back.

Regards
Norbert

Thanks Nobert!
But i have already sent it back, i´m afraid.
I think that i have the time, it still winter for some weeks
But next time, if there is still problems i will do that.
Thanks and regards
David