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z24s vacuum advance


Chrisco
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Hi !!
I have a question about vacuum advance.
I have read that the vacuum is highest at idle and when you open the carburetor throttle the,(wot), vacuum decrease.
I tested the vacuum advance on my distributor...at idle the vacuum works nice.,, (it engage) ,, ..but when i open the carbuteror throttle , (wot) , the vacuum stays on ...does not go back to initial.,(except when i stop the engine) .. ..ANY IDEAS ???

rsz_dsc01374.jpg

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I've read that some vehicles have the vacuum advance hooked straight to the manifold, but others have it hooked to a ported vacuum source on the carburetor, which modifies the operation of the advance. I'm not 100% clear on how that works or what Nissan did, but that's where I'd start researching to see if what your advance is doing is what it's supposed to do or if there's a problem.

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