Re: 1941 Packard 160

Posted by TxGoat On 2023/4/14 12:28:48

A miss at higher speeds and loads could indicate an ignition problem or a fuel problem. Driving some distance in warm weather can make minor fuel delivery issues worsen. Some Packards had a fuel pump shield and special insulating sleeves to help keep engine heat away from the fuel pump. These are often missing. Stale fuel can cause issues.
Any tiny air leak anywhere on the suction side of the fuel system can cause issues, and warm weather and higher engine heat can make them worse. Fuel filter bowl gaskets can cause air leaks, as can any fitting in the system, or a pinhole leak somewhere in the fuel line. A clogged or restricted gas cap vent can cause issues. An accessory fuel filter on the suction side of the fuel pump can be expected to cause problems. The stock filter arrangement is usually best, as long as it is kept clean and completely air tight. Ignition problems, such as oxidized points, a weak or dirty coil, dirty spark plug insulators, etc can cause missing under load or at higher speeds. Late intitial timing can make an engine run hotter and lose power, and so can problems with the automatic advance equipment on the distributor.