Just an FYI for some of you out there.
After my M5 got written off last week I had to press gang the Williams into service. But Lo! It wouldn't start at all, even though I drove it the week before...
Why?
After pissing about a bit with my non standard setup, checked the plugs
These are what we call 'fouled' plugs. Massive carbon build-up causes a 'no spark' situation.
Temporary fix is to swap them for new ones, but the source of the issue will remain.
In this case it is likely to be over fuelling or a poor burn of the fuel going in, or both. This is caused by either a MAP designed to overfuel to reduce the chance of detonation or because a sensor is misreading. It could be leaking injectors as well, but all four is extremely unlikely!
In my case I suspect a slightly overfuelling map (often done on a slight level to minimise risk of det.) and a coolant temp. sensor issue. Maybe not the sensor itself but the wiring possibly.
Anyway...schooling over for today kids.