Ignition coil

[ARamah]

Hi
C300 2008. VIN:WDDGF54X08F048646
The ignition coils burnt out frequently and randomly I mean it is not for specific one cylinder. The technician said that the ECU is defect.
I bought used ECU ( A2721533779) but he said it is not for this model (Original ECU No A2721500079).
My inquiry:
1- Do you think he is right that the ECU is defect.?If not what can make ignition coils burn out?
2-Could we fix this ECU ( A2721533779) in this car?

thanks

 

[mattkh]

Which brand of ignition coil are burning out..?
How many miles are the coils going..?

 

[ARamah]

Which brand of ignition coil are burning out..?
How many miles are the coils going..?

OEM ignition coils ( original ones)....the odo is about 150000 miles... the coil burn out after driving for about 30 miles.

 

[mattkh]

Thanks.
If you have an old one that burnt out, then please put up a picture of that one.
How many coils are there on your car engine, 3 or 6.

 

[ARamah]

Thanks.
If you have an old one that burnt out, then please put up a picture of that one.
How many coils are there on your car engine, 3 or 6.

6 coils... sorry I don't have the old coils at the moment because the car still in workshop ..

 

[mattkh]

So looks like you have a coil that sits on top of each plug.
All these coils will be connected to a computer which will cause a spark in each plug at different times.
If the coils are failing randomly, i,e coil1, sometimes coil say 4. then the common thing is the earth connection for the computer and the earth connection to the engine.
Check and clean these earth connections.

 

[ARamah]

So the ECU is OK and the problem caused by bad earthing .

 

[mattkh]

I would check the earths first.
The ECU can be sent to companies that can test it, some can even repair it.

 

[alexanderfoti]

I would also check the earth from the block to the chassis as well.

but

A dodgy ecu I suppose could keep the pulse on the whole time, but I am sure the car would drive horribly.

Also, no that ECU cannot be used on your car, the part numbers must match

 

[ARamah]

T

I would also check the earth from the block to the chassis as well.

but

A dodgy ecu I suppose could keep the pulse on the whole time, but I am sure the car would drive horribly.

Also, no that ECU cannot be used on your car, the part numbers must match

Thank you very much for your help