Hi to all! I have a 3dr sierracosworth with P8 Group A ecu and it words fine. Then I decided to put my L8 back again but with the wasted spark plaquet in it daught from MSD. Si soldered the plaquet in the l8 with yhe modified wiring and tried
to start the engine. The problem is that the engine dont start. I double vhecked the solderings the wiring and the ignition pipes and modules all ok! Sensors ane all new to! When I unplug the first an the fourth pipe the spark is good as it sould and in correct time! But the 3rd and 2nd pipes gives spark for some time in wrong time and the sprk is very weak! Then I unplug the L8 and puy the group a P8 and the engine runs very good. Does anyone have any idea what is wrong? Thank you in advance! Here is a youtube link with all these I discribed!

 

So when you plug the P8 back in you also had to change the wiring to amps and coil back to original ? As you will have changed it all to wasted spark set up ?

 

P8 has the same wiring to the wasted spark setup as the p8 has a wasted spark without any aquet...it is an group A P8 ecu.