Vectra crank sensor

The ECU is sufficiently clever to identify engine position from just the Cam
phase sensor, based on when no.1 comes to TDC and can then work out the
position of the other cylinders from rotational speed from the CPS, when it
has done this, it will fire the plugs and injectors and the engine will
start. It does however require a long burst of cranking to do so. If you had
kept the starter spinning in a long burst it would have probably started
fine after a period of cranking. The Simtec ECU is one of the most
sophicticated units on the market at the moment, the ones in the new Vectra
and new 5&6 series BMW's have teriffic power.

Tim..

 

The ECU is sufficiently clever to identify engine position from just the
Cam

I did try long (20-30 second) bursts, but it seemed to take the same amount
of tries to get it going, no matter what the length.

Does that mean I was not pumping fuel into the cat while starting, if the
ECU had not worked out the position yet?

Bob

 

No. The ECU wont fire the injectors unless there is a spark (at the right
time)

Tim..