The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Help a NOOB

rshaff · 07-03-2018, 06:49 PM

a thought may be that your vacuum advance canister is either punctured or not operating properly. an easy way to see if the canister is working is to pull the vacuum line and suck on it, if it holds vacuum it is at least not punctured. another thing to do would be pull the distributor cap and observe the plate where the points are mounted moving as the vacuum canister is attached.

where you said that at 2000 rpm it seems to smooth out this may be your mechanical advance kicking in.

hope this helps, I ran into this on a '70 recently.

07-03-2018, 06:49 PM	#38
rshaff Registered User Join Date: Jun 2018 Location: wa Posts: 1	Re: Help a NOOB - A continuing saga a thought may be that your vacuum advance canister is either punctured or not operating properly. an easy way to see if the canister is working is to pull the vacuum line and suck on it, if it holds vacuum it is at least not punctured. another thing to do would be pull the distributor cap and observe the plate where the points are mounted moving as the vacuum canister is attached. where you said that at 2000 rpm it seems to smooth out this may be your mechanical advance kicking in. hope this helps, I ran into this on a '70 recently.