I just uploaded this simple fix on my Testarossa. It takes less than an hour and so far has cured the issue. i will be monitoring it over the next couple of weeks and if I get a repeat hot start issue will be adding a Relay (will also video that if required) Hope it helps
Good deal. Thanks for documenting and sharing. Steve also wrote a similar article on the fix a few years back. https://www.stevejenkins.com/blog/2015/07/diy-fix-a-ferrari-testarossa-512-tr-hot-start-problem/
I did this and it works for a short while, but I eventually did the relay and that fixes it permanently. Just do the relay.