Originally Posted by Philly
not another one!!
I just spoke to some other dude whos got the same thing! EFi clocks, whats it all about?
Well you want a little resistance as possible 0.01 would be nice, but that aint ever gonna happen on a 15 year old bit of wire!
should be looking for 0.03-0.06 or something?
if you dont get a reading at all then theres a break in the wire!
What I mean is - this wire obviously sends it's RPM signal back to the ECU and rev counter so a break in this wire will cause the ECU to stop playing ball?
As for EEC-IV clocks - the reason is that EEC-IV uses wasted spark, the other spark which is 'wasted' is used to send the rpm signal back to the ECU and also to the rev counter. Effectively this signal is half the signal you'll get from an older coil type system (like Weber Cossie management) which sends out a spark for every rpm of the engine, so send coil signal to EEC-IV clocks and it thinks the engine is doing double the rpm it actually is.
Simple enough really - I have the correct clock to replace it (hopefully), using a coil non EDIS rev counter, gonna have to bugger about with the soldering on the back though as the contact points are different.
I'll have to try the green wire out tomorrow.
Cheers,
Andy