E9 Csi ECU

Georgie22

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Commugny, Switzerland
Hi everyone, I have a 1972 BMW 3.0 CSi VIN 2262612
I have an issue with the ECU it seems, do you now where I can get this repaired by someone competent.
I am based in Switzerland.
 
Pretty rare for those to go bad. Have you tried borrowing a spare?




What symptom makes you think the ecu is bad?
one of the injectors is not working and thus runs on 5 cylinders. Garage cleaned the injectors and said it was the ECU that was defective.
Any idea what else it could be?
 
Pretty rare for those to go bad. Have you tried borrowing a spare?




What symptom makes you think the ecu is bad?
I don't know anyone with a spare. Here in Switzerland these cars are not very popular
 
If it is 1,2,3 or 4 they are likely wrong.

The e9 forum has a djet loaning library.

You pay shipping and we loan the part.

We have Ecu’s to loan out.
 
IMG_1847.png
 
As fare as I know,
There are 3 cylinder are triggered together by the ECU ?

Check for broken wires from the ECU to injectors.

If not, maybe only a cold weld in the ECU.

@sfdon Already post the diagram.


Breiti
 
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The garage didn’t need to clean the injectors to say the computer is bad…

Every shop should have a Noid light tester.

 
I think 2 drivers and 4 connectors at ecu.
Very unusual.
Firing 2 banks of 3 but using single wires to 5 and 6.
 
Name
address
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send me a PM by clicking on the sfdon icon.

I will send out a test ecu.

I’m in Amsterdam, Paris and Malaga next month- no Zurich…. Otherwise I could deliver. :)
 
Check this side

Cylinder 1, 3, 5 and 2, 4, 6 have each a commen driver.

So if the electronic will be bad, you have 3 valves not working.

The rest is wiring outside the ECU or
a conductor path , a connector or a bad weld in the ECU.

Good luck

Breiti
 

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Last edited:
If it is 1,2,3 or 4 they are likely wrong.

The e9 forum has a djet loaning library.

You pay shipping and we loan the part.

We have Ecu’s to loan out.
SFDon’s lending library of Djet parts is a life-saver for CSI owners, as is, of course, his knowledge. Get to know him, he is an invaluable resource.
 
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