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vacumm advance problems

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Old Sep 25, 2011 | 05:59 PM
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Question vacumm advance problems
I have a 73 f-100,302,2brl carb,c4 auto. It's been running great for awhile now,then the other day started running rough then wouldn't run at all.I took the plugs out and cleaned them and got it running again.My problem is it will run perfect with the vac adv unplugged ,but when hooked up it will stumble under slight throttle.It was running good with it hooked up before but now won't. All i did was clean the plugs! Any ideas what could be going on? It has a new duel port dist.
 
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Old Sep 25, 2011 | 06:08 PM
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Have you checked to see if the advance mechanism moves freely and holds vacuum?
 
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Old Sep 25, 2011 | 06:13 PM
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yes it moves freely and will hold a vacuum.
 
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Old Sep 25, 2011 | 06:18 PM
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Check the advance with a timing light.
 
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Old Sep 25, 2011 | 06:24 PM
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Why would it be running so good before with vac adv hooked up and now it won't. I didn't change the timing or anything else.
 
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Old Sep 25, 2011 | 06:36 PM
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The way it was running,I thought carb problems but when I unhooked the adv. it ran perfect. Will it hurt anything to run with it unhooked?
 
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Old Sep 25, 2011 | 06:39 PM
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without running the vacuum advance, you'll still get be using mechanical advance, so it will run without a problem. Before I swapped in a new duraspark for my old one, i ran no vac advance because it'd advance the timing too much too soon. I run the vac advance now with the new dizzy, but it also works right.

Also are you running the vac advance on the ported or manifold vacuum port?
 
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Old Sep 25, 2011 | 06:43 PM
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Thanks,I guess I'll run it that way until I can figure out what went wrong with it. I'm running the advance on ported vac.If I try to put manifold vac to the advance it kills the engine!
 
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Old Sep 25, 2011 | 06:59 PM
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If I pull the dist. what problems should I look for?
 
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Old Sep 25, 2011 | 07:02 PM
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what do you mean by "kills the engine"?

I'd just check to see if your vacuum canister is even working properly first.
 
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Old Sep 25, 2011 | 07:05 PM
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I'll get it running and switch the adv.hose to manifold and it cuts off.
 
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Old Sep 25, 2011 | 07:16 PM
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that's weird. I'd help but i'm still learning this stuff too and i've never heard about anything like that. hopefully someone else will come along and have something to say.
 
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Old Sep 25, 2011 | 07:18 PM
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Thanks.Yeh I'm learning to and this has got me stumped!
 
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Old Sep 25, 2011 | 07:25 PM
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Retrace your steps, see if you crossed those two vacuum lines. Did you leave the PVC unplugged? Had something like that on my 74'. I swamp it out eventually for a simpler single unit.

good luck.
 
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Old Sep 25, 2011 | 07:29 PM
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I thought I had everything hooked back up right but I have been wrong once or twice before. I'll recheck tomorrow when I can see.
 
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