Originally Posted by
2Litre
Thanks very much, it makes a bit more sense now. It would appear that the cps tells the ecu crank position/ all timing aspect of the engine. i.e.- injectors/ignition. The phase sensor fills in the gaps telling the ecu where the engine is in sequence. So in theory could you not unplug the phase seńsor once the engine has started as it would already know the sequence.
Cheers.
Tim
Depends on the ecu. Some might allow it, some wont.
On a crank trigger where there is no cylinder ID....it would not be a good idea. At least with something like a 36-1 where there is still a partial ID...ie TDC for either 1 or 4 ( or 2/3 ) and it's easy to recognise any disparities in a tooth count from this, then that ecu may allow you to ignore the phase sensor once running.
But on a system where the crank has only 4 teeth...with no real distinguishing features for want of a better description, then chances of any ecu allowing it to run without a phase sensor are slim ( although as this system also retains a dizzy....again it's perhaps less critical as it could never fire a spark on a wrong cylinder )