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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: SUX2BU99 on July 20, 2010, 12:12:11 pm
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Are vacuum advance canisters for HEI distributors universal in their fit and operation? Prices certainly vary from different manufactures. I have a Mallory HEI distributor that I feel the adjustable vacuum canister is faulty and causing erratic behavior and I’d like to replace it. I have a stock GM HEI distributor kicking around that I could take the non-adjustable canister from and put it on the Mallory. Will it fit?
I was tinkering with the GM one still on the distributor and I was surprised at how much effort it took to make the shaft in the canister move. The springs seemed pretty strong and for just engine vacuum to make that move, wow.
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Did you get your module checked? I had bought a new Accel distributor from the parts store, put maybe a couple thousand miles on it. Put the truck down for a couple years, pulled out the module and took it down to O'Reilly's, and they tested it and it failed. Makes me wonder if that was giving me my somewhat erratic nature? I'm fairly certain it was a combo of things but it didn't help.
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Interesting. No I haven't thought of the module since I figured when they go, they just cut out entirely. I was figuring it was my advance canister because at WOT it seems to be okay. It's only at part-throttle cruise and light acceleration where I see erratic issues, and that would be when the canister is operating.
How did the store test it? And what were they testing for?
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They have a machine they hook it up to. They test to see if it's switches correctly. He ran it through twice, the first time it passed, the second time no because he said sometimes they fail when hot.
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The module can fail in low, mid or high rpm ranges or completely; if I am not mistaken.