1940-120-runs fine for a while , then sputters and quits

Posted by Dan Marrin On 2008/8/1 21:16:11

I have a 1940 120, which I have just been able to check out recently, although I bought it over a month ago. The car starts instantly, and runs strong and smooth, with oil pressure to the right of center on the gauge, however, after driving at 50-60 mph for 15 to 20 minutes, the engine begins to hesitate and eventually just peters out. If allowed to sit for a while, it starts right up fine and runs OK for a while, then exhibits the same failure. I have to assume the interuption in performance has something to do with the engine or some of its components getting to a certain termperature? Maybe the coil gets hot and fails. Maybe a fuel problem (vapor lock). Any suggestions? Since my heat gauge not working; I guess I may have to get that part going to help me in my diagnosis of this problem?