Tim Cole Quote:
If your car has dual exhausts then stuff a rag into the driver's side tailpipe during warm up. This will avoid the royal pain of fixing the heat riser if it is not working.
Well, that's a "redneck" solution if I ever read one. And the "heat riser" is the path the hot gases take, whereas the suspect mechanism is known as the "Exhaust manifold heat control valve" in Packard parlance, but is a thermocoil valve to everybody else.
Nonetheless, I twice suggested to patgreen to check this because his symptons indicate that it is at fault. However, it also could be some part of the cold start mechanism on the carb.
Finally, after all that: the thermocoil valve and 4GC carb on my 55 Pat work perfectly. I've overhauled hundreds of carbs of various kinds over the years, so I'm confident I know what I'm doing. I usually do have to readjust the choke static setting between Winter and Summer since we get such extreme variances in temp here in Southern Nevada high desert.
This morning it started instantly even though the overnight temp was below 40F and was about 45F at the time and that was because I had driven it the day before. Still, I occasionally find that if I let my Pat cold soak for a week or more during Winter, I need to use some spray ether to get it started quickly, otherwise it just wears out the starter, although it will eventually start. My 1976 Firebird with a Quadrajet is even worse. Anymore, I don't even try to start it in the Winter without ether spray.
Craig
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=135644