I can't tell you how many posts there are on this issue but there's a long running debate on whether it really matters if you're running your vac advance off of ported vac or straight manifold. As I understand it, vac from the CTO (ported) is blocked off until the engine reaches operating temperature. Once that happens, there is no difference whatsover between manifold or ported but in cold climates, it could take as much as 10 miles of driving before this is so. I suppose that the engine runs a little better when some things are switched off before it's warmed up but why vacuum advance would be included in this from the factory is a mystery.
I have never run well upon starting in cold weather and I've always chalked it up to the choke. It would lag if I hit the accelerator when backing out of my driveway and would sometimes stall. On the flats, performance would be awful... that is, until the beast warmed up.
Tonight, I switched my vac advance to full manifold and it made all the difference in the world. It's like a completely new truck. No stalling and no lagging when cold.
Moral of the story is if there's a poll out there on the subject, there's no doubt which way I'd vote. Someone will have to explain to me why if I'm an AMC emissions engineer, I wouldn't want to advance an engine when cold please because right now, I'm thinking that the idea was just plain stupid.
My two cents...
I have never run well upon starting in cold weather and I've always chalked it up to the choke. It would lag if I hit the accelerator when backing out of my driveway and would sometimes stall. On the flats, performance would be awful... that is, until the beast warmed up.
Tonight, I switched my vac advance to full manifold and it made all the difference in the world. It's like a completely new truck. No stalling and no lagging when cold.
Moral of the story is if there's a poll out there on the subject, there's no doubt which way I'd vote. Someone will have to explain to me why if I'm an AMC emissions engineer, I wouldn't want to advance an engine when cold please because right now, I'm thinking that the idea was just plain stupid.
My two cents...
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