Folks, I had to change my vr engine due to previous frost damage. I sourced a AAA code engine, swapped over the ancillaries and put her back in. On turning the key the car is cranking over fine however she will not fire. I removed one plug and turned her over but there is definitely no spark. Any ideas folks as I've literally unplugged one engine and plugged th new one in. The immobiliser works as before. The new engine came from a sharan. There are a couple of spare connectors on that loom but that should not affect car starting. My only thought is that the ecu is not seeing crank. Where is t