hmmmmmmm

Would be worth checking your cam belt isn't a tooth out firstly i would say.

And just to clear up, its only Series 1's and the very very first S2's that rolled out the factory that don't have knock sensors. Anything 87/88/89/90 will definately have one.

And running an earlier ECU on a later loom is fine, its when you run a later ECU that needs the knock sensor signal without the sensor thats bad