Looking for some suggestions. I've got a VQ35 in a jetboat on a G4 storm. It was tuned by an authorised link agent. The problem....
When it has been run for a while (fully up to temp) if I turn it off for around 3-5 mins and try to start it it is hard to start. I have to jandel it and crank for ages and it eventually catches. Cold start great. Starts fine if I wait 20mins or more. Starts fine if I turn of and start again immediately. problem appears to be only when left for short period. The supplier has said play around with crank enrichment which I have done but hardly notice any difference. Agent knows how to charge and doesn't seem to be coming up with useful suggestions. I don't really know what I'm doing and trial and error is not working.
Anyone got any suggestions. I'd love to know whats happening and make some intelligent attempt at resolution.