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Old 05-23-2002, 05:50 PM
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Post Distributor or Plug problem?

What would cause my engine to want 20deg of timing cold and 12deg when hot? I mean it wont even start unless i move it to these two positions. I have an HEI distributor, AC Delco R45S plugs gapped to .040", 8mm wires.

Is this a case of plain old vapor lock or is something in my system changing with the heat? I'm not sure if I need Octane booster or to rebuild my distributor.

Any suggestions would be great.

Thanks,
Jim

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Old 05-25-2002, 02:03 PM
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Does the distributor have points, mechanical advance or does it have an ignition module?

If module...is it controlled by an ECM or have mechanical advance?
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Old 05-25-2002, 02:15 PM
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HEI is a GM electronic distributor. No points. It does have a module on board the distributor. It also used a vacuum advance. I was used from 75' to some time in the late 80s.
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Old 05-25-2002, 06:35 PM
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Check the mechanical advance weights and springs. It sounds as though they are binding. It is a common occurence.

You may also have a bad module/stator. Are they aftermarket or Delco? Either (or both) may be bad but only show up with heat. Use a hair dryer on the module before starting and see if it is hard start.

What year is the engine? If it is mid-seventies, the cam timing itself will be retarded (assuming your timing chain is ok).
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