distributor swap = vac advance problem?
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distributor swap = vac advance problem?
390, pretty much stock. i've been running it for about 2 years without any major changes (or trouble).
tonight- i swapped the distributor. full disclosure- its my first time stabbing a dizzy in on my own.
it seemed to go pretty well- i was at TDC on compression stroke, noted the position of #1 on the cap, made sure rotor was lined up there after re-installation, etc.
here's where it gets weird.
i moved my vac advance can over from the old distributor.
after hooking everything back up, i started the engine.
it would idle...but any activity on the gas pedal, and it started to stall.
i figured the timing was probably WAY off, so i disconnected the vac advance (hooked to ported vacuum), and hooked up my timing light....
and it suddenly ran fine- i could goose it, without stalling.
and the timing was right where i wanted it.
i hooked the vac advance back up...and it went right back to stalling off idle.
i don't get it- i've been using this advance can for 2 years.
what about the vac advance would make the motor all but die off idle?
tonight- i swapped the distributor. full disclosure- its my first time stabbing a dizzy in on my own.
it seemed to go pretty well- i was at TDC on compression stroke, noted the position of #1 on the cap, made sure rotor was lined up there after re-installation, etc.
here's where it gets weird.
i moved my vac advance can over from the old distributor.
after hooking everything back up, i started the engine.
it would idle...but any activity on the gas pedal, and it started to stall.
i figured the timing was probably WAY off, so i disconnected the vac advance (hooked to ported vacuum), and hooked up my timing light....
and it suddenly ran fine- i could goose it, without stalling.
and the timing was right where i wanted it.
i hooked the vac advance back up...and it went right back to stalling off idle.
i don't get it- i've been using this advance can for 2 years.
what about the vac advance would make the motor all but die off idle?
Senior User
Joined: Jan 2012
Posts: 136
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From: Houston
Mine did that when I swapped dizzys and cannisters. The problem was that one of the cannisters under vacuum pulled too much on the attaching arm, like 3/8" or more, giving too much advance. Use some lungpower and see how much it pulls, should only be like 1/4" inch. Mine was broken or not adjustable so I got a new one and all is well.
puttster
puttster
Rusty Roller
Joined: Oct 2011
Posts: 1,423
Likes: 5
From: Santa Cruz Mountains
Look at the arms of the vac adv cans. There should be a number stamped in the arm. Different advance curves for different applications. The look similar at a glance. Also the total advance stop could be bad or screwed up.
.
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Thread Starter
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How do I check the total advance stop?
Is there any chance that the breakers plates were different between distributors? meaning- should I have moved the vacuum can AND the breaker plate over from my old setup?
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update- i put my old breaker plate in, and the problem went away.
i'm not sure exactly what the issue was- the new breaker plate was in much better shape than the old one.
i couldn't swear to it, but it looked like the vacuum canister arm might have been binding on the newer breaker plate.
i'm not sure exactly what the issue was- the new breaker plate was in much better shape than the old one.
i couldn't swear to it, but it looked like the vacuum canister arm might have been binding on the newer breaker plate.
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