Hello all,
My 87 300TD will not start when it has been driven up to operating temperature, shut off, and left for 20-50 minutes. When I get back to the car after an errand, it cranks and cranks, but will not fire. It starts when cold very easily, even in the dead of a Minnesota winter. What gives? I have done some searching on the forum here but could not come up with an answer. If anyone has some advice, it would be much appreciated. Thanks in advance!

1987 300TDT ~264,000 miles