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My Chevy 327ci motor wont start when its cold unless I set the timing at 20deg BTDC initial timing. Once I've been cruzing for a while and shut off the engine it wont start again unless I set it for 12deg BTDC initial timing. Once it gets coold again I need to go back to 20deg BTDC. Once I set the timing to its sweet spot, it starts at the touch of the key. What a huge pain in the BUTT!

What is happening? Vapor lock? Distributor needs to be rebuilt? Octane problem?

Jim

<img src="confused.gif" border="0">
 

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Just a thought but make sure that you have a GOOD ground from battery to engine and the chassi!
Assure your distributor is grounded properly!
A poor ground will make it waunder, possible.
Good luck.
 

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Your mechanical advance mechanism in the distributor is sticking. Get a rebuilt unit that one has had it, you could rebuild it but you'll likely find that the pivot posts are grooved and corrosion has trashed most of the components under the breaker/pickup plate. It's cheaper just get another new unit.
 
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