Sm4 no signal on ignop3

[sikko]

Hi im tryning to start up a bmw m5 engine with sm4 and msd dwell controlled coils. Everything looks nice 250rpm/min when cranking and the cyl cynk is at 52% but the coils connected to ignop3 is not firing changed the coils but the same.

Setup cranc disc with 3 triggers one at the camsync Hal type both.

Nothing recorded in ecu history

Ignition setup
1. 3 o/p 6cyl-WS
2. -ve edge (DWELL)
3. 10
4. -40.0
5. 50.0 This is checked.

I/P Cylinder cync
1. cylinder pulse
2. 6
3. 50.0
4. fast
5. hal
6. rising
7. fast
8. hall
9. rising
10. yes

If anybody has something to comment please dont hesitate will try everything..

Mikko Sweden

[Ian]

That is an indication that Sync is being lost and the ECU is inhibiting Ignition outputs until it can re-Sync again. Can you advise the engine position that the Sync pulse occurs at and also try changing the Cylinder I/P filter to Slow.

have you confirmed that the Cylinder 1 Ignition point is in about the correct position.

[MRMRacing]

Posting your cal file here would help us to check.

[sikko]

I tryed the slow function. The gap betwen the sensor and disc is 1.0mm i have installed smc and sm2 before an never had any problems starting.. Posting cal...

[Ian]

Can you try these cals to see if any fix it? If not, we still need to know the engine position when the Cam pulse occurs