Hi everyone. I'm having an issue with my LS that's driving me insane. Before I start throwing more parts/money at it, I was hoping someone here might have an idea or have seen something similar before. My LS will start perfectly when it's cool, but not when hot. I can start it up and drive it somewhere, but when I park it and turn it off, I cannot start the car until it cools down again. It cranks, but won't start. The car runs flawlessly otherwise, with no roughness, no hesitation, and fuel economy is good as it's always been. No check engine light and no codes are thrown. I have searched the forum and Google, but haven't found anything that describes the problem perfectly or that I haven't tried yet. If you know of another thread, please link me to it and accept my apologies. Details on the car: 2005 Lincoln LS V8 Sport. 230,000 km (140,000 miles). Bone stock. I have owned this car for 10 years and around 100,000 miles, but it was stored for around 4 years as I was having medical issues and couldn't drive. I am currently driving on the valet key (lol) as my mother threw away both sets of keys while it was sitting in her garage during a cleaning purge, thinking they were my grandfather's old keys. Not sure if relevant. This issue started after I put it back on the road two years ago, but it was intermittent and the car would start after sitting about 3-5 minutes. It is now constant and the car needs 30-45 minutes before it will start up again. Battery was replaced after putting the car back on the road, and is in good shape. I tried swapping in one from my other car anyway and the issue was not fixed. I replaced the cam and crank position sensors, as I've had issues with failing sensors becoming heat soaked with Fords in the past. This did not fix the issue. (Once I found the crank sensor, I felt foolish to think this was getting heat, but did it anyway since I had the replacement.) I then borrowed a friend's scanning tool which does live data and noticed that when it's having trouble cranking, the fuel pressure was quite low (~18 psi). When it starts, it was in the 40-50 range. I replaced the primary fuel pump (pass. side) and now have a consistent 58-60 psi fuel pressure on startup. But the issue persists. I got a better scanner and collected more data while driving. Coolant temps are a little high but not that much (car idles around 205-210 degrees, reaches 215-220 at WOT but quickly settles down to 205). It might be due for a cooling system overhaul soon but I don't think this would cause the no-start issue. What's interesting is that the issue doesn't seem to be correlated to the coolant temperature. Even after the coolant comes up to normal running temperature, the car will still start again as long as it hasn't been running longer than 10 minutes or so. So I am at a bit of a loss here, and I'm hoping someone might have seen this in the past or have an idea where to look next. I'm not opposed to buying parts to try things out, but I'd rather not throw a lot more money at it grasping at straws. I still have the scanner and I can go collect any other requested information. Thanks in advance and sorry for the long post. I just wanted to make sure I gave you enough information to work with.