Anyone know why an induction timing strobe gives different signals when open and closed?

 

I checked my timing yesterday, and lo and behold I was running at 0 TDC, zilch advance. No wonder it felt a bit flat :rolleyes:

 

Redone the timing with the loop open, and whey-hey - back to full fierceness, even spinning on the dry away froma standstill :dance:

 

I know Andy Duff has warned about this before - take heed of this man :bow:

 

So, any ideas why this happens?

 

Cheerz

 

StuartR

No idea but it only seems to do it when you use the loop on the PTU, if you put an ignition lead between the coilpack and plug then read it it makes no difference.