charlie, i dont think youre understanding what SECS is saying.
what he means is that thee test on the bench was not correct. ie you state:
With the ECU removed and on a bench with a similar signal running into it at around 5000rpm the ECU produced random spark signals.
whereas what simon is saying is that what actually happened was:
"with the ECU plugged into some equipment which provided signals that were not the same as what your engine would and infact would be expected to cause erratic behaviour, the ECU behaved erratically"
ie you cannot draw any definitive conculsion from this particular test
if you scroll up you'll also notice that stu@MSD has also agreed with simon on this subject
does that make it any clearer?
ta
Jim