Hi guys, my 3dr keeps misfiring as its coming under load. It's only done 85000 miles, original engine, and I have out new iridium plugs in it, gapped from 0.6 mm down to 0.5mm.
The car is running stage 3, with t3 turbo and still has the antiquated dizzy and rotor arm system. I have a group a coil, with magnecor leads, new dizzy cap and rotor arm, but it still keep missing , only under load. Idle is sweet.
Been looking at the wasted spark system that msd has to offer, but does it really work? £400 seems a lot to me, but if it cures it, then I will be well chuffed.

Cheers

 

I've put msd wasted spark on mine and its great never had any issues it's a great upgrade

 

Crank sensor, phase sensor !

 

Put some 071 ford plugs gapped to 0.6 new phase sensor gapped, check fuel filter

 

Wasted spark is good I have it on mine but it won't solve an undermining problem, a group a coil and good condition standard set up should work ok, I would try some 071 plugs gapped at 0.6 and check all sensors and gaps first, nothing worse than spending all that money and still having problem. But I always find the symptoms you have is down to plugs or plug gaps.

 

Put some 071 ford plugs in

Iridium don't fuck with the gaps

And they hate overfuelling