I had a look at the engine again today in an attempt to solve the issue of the engine dying. Even with the engine not running but the ignition on I sometimes get strange tacho signals, showing that the engine is running when its not! I unplugged sensors one for one and it carried on, even when the engine loom was completely disconnected! At this point I was short of options, so I decided to look at the 55pin ecu connector…and the engine speed hall sender terminals in the plug look a bit dodge!
The pins are on the top right, 6 from the right.