All,My 2006 RRS has never failed to start (touch wood), but the duration of cranking before it starts seems to vary between almost straight away and 3-4 seconds and I can't determine any specific cause. Once started the car runs absolutely fine.... I don't believe it is fuel related, as I've let the fuel pump charge up from anywhere between 1 and 5 seconds. It's not heat related as I see this on both cold and hot starts. I'm thinking it may be a bad crank position sensor, plugs but I am open to any and all ideas on where to go hunting. BTW I've had AJ8 engines in many different jaguars over the years (2 S-types, an XJ8, an XK8 and an XF SC) and none have ever had a problem firing within .5 seconds of cranking..... The car is an RRS 2006 non-supercharged with ~128k miles. No full history so not sure if plugs a CPS were ever touched.