E30-E36 Chamshaft position SENSOR problem??

[ReSuL]

I have an AFR and it says 14,6 most of the time..

How can I be sure about the failing coil driver in the DME??

[romkasponka]

Failing coil driver would give you rich because in one cylinder fuel would not be burned.

[Nelson_40]

Failing coil driver would give you rich because in one cylinder fuel would not be burned.

Duh on my end saying lean running due to coil issues, you are quite correct that would cause rich running. I still think an examination of the plugs will yield the some useful information.

[keflaman]

I have an AFR and it says 14,6 most of the time..

How can I be sure about the failing coil driver in the DME??

I was getting fault code 1271 "#1 coil" on the stomp test (and IIRC, 55 on my scanner). Swapping in different coils didn't do anything, but it went away when I swapped in a different DME.

[romkasponka]

I was getting fault code 1271 "#1 coil" on the stomp test (and IIRC, 55 on my scanner). Swapping in different coils didn't do anything, but it went away when I swapped in a different DME.

Once I had failed coil driver in DME but it was not firing at all. My friend replaced them, but probably newer transistors are faster so ignition timing was off, but it worked at that moment. Later I just bought other DME. And the problem why coil driver failed was because ignition coil was failed. So bad ignition coils burns your DME!

[keflaman]

Once I had failed coil driver in DME but it was not firing at all. My friend replaced them, but probably newer transistors are faster so ignition timing was off, but it worked at that moment. Later I just bought other DME. And the problem why coil driver failed was because ignition coil was failed. So bad ignition coils burns your DME!

I faintly remembered reading that once, so my test was conducted very quickly!:eek:

After removing the plastic cover and inspecting them closer I could see the laminated steel core was de-laminated and bulging where rust had started between the layers. Maybe I should take a few pictures to show what I mean?

[romkasponka]

I faintly remembered reading that once, so my test was conducted very quickly!:eek:

After removing the plastic cover and inspecting them closer I could see the laminated steel core was de-laminated and bulging where rust had started between the layers. Maybe I should take a few pictures to show what I mean?

In my case there was a crack on plastic body.

[ReSuL]

I have ignition fires all the staff with no code on DME.. but I am suspicious of the timing because of CPS that is why I tried the replace CPS.. and the question is lets remember does E36 CPS work on E30??

[ReSuL]

Here is the answer... NO! it seems nothing changes but in a few days the injector's timing changed from 3,40 to 1,92 which made the fuel consumption worse with no power gain...

so I put the old one on but I am sure it doesnt work...