Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - HEI, Vacuum, and Tach issue
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Old 04-07-2012, 05:53 PM
joe_padavano joe_padavano is offline
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Originally Posted by mscaggs
OK, this one is weird to me. I just bought my car and it has a 350 ZZ4 motor with HEI distributor. Now, the tach did not work when I bought the car and I discovered the wire on the side of the HEI unhooked. So I hooked it up and the tach started working. Now, here is what is interesting. The car driving down the road just started to die but when I put on the brake it would start running again. Vacuum! Iím going, okay, this has something to do with the tech connector and distributor. I unhooked the tach and she runs great now. Could this be a bad vacuum advance or distributor? I didnít think it would be electrical since it cleared up with a push of the brake, again, vacuum. I could use a little help on this one and thanks

The tach has nothing to do with vacuum advance. Check to see if the tach feed wire is rubbing on the brake pedal under the dash. A short there WOULD cause the car to die out.
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