wasted spark problem

Post Sun Sep 16, 2007 8:11 pm

started me car for the first time since i strapped a turbo to it, and it started first time with the wasted spark all good, all of a sudden its misfireing, cylinder 3 and 4 are sparking but very weak, the rest seem very strong??
any ideas??

Post Mon Sep 17, 2007 9:00 am

Make sure the HT leads are not arcing out against anything, I found the wasted spark system has much more power and in turn will jump out of the leads much easier. Bigger & better leads helped mine no end.

HTH, Mark,

Post Mon Sep 17, 2007 12:56 pm

na no arcin, just really weak spark but the rest are fine? doin my head in!!

Post Mon Sep 17, 2007 7:25 pm

Kevins old MS ?

if so, open the lid and check the coil ignitor wiring, there was a bad joint in the iirc dude, blob O solder should have it up and running OK again, if not replace the VB921Z ignitor FET and try again, they are relible units dude, but I have killed one with too much dwell so it can be done.

Post Mon Sep 17, 2007 7:27 pm

I had a week spark on my wasted system and i grounded the coils inside the unit directly to earth and it solved the problem?

Like you say it provides a strong spark so a good earth is needed to provide sufficient dwell.

Post Mon Sep 17, 2007 8:33 pm

cheers boys will open it up tomorrow an take a look..