Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks



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Joined: Mar 2002
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Shade Tree Mechanic
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Shade Tree Mechanic
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If your wire is OK, I'd say check inside your dist. cap for a crack (or you may at least see a trace of carbon) near the No. 4 position. Your juice may be taking a little shortcut to somewhere else in there, instead of going all that way out the wire to the No. 4 plug. Electrical currents are lazy like that.

Last edited by 46 Panel; 12/18/09 03:49 AM.

Doug

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Grease Monkey
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Grease Monkey
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I have tried all your suggestions ,it does not make sense to me why this is taking place,I have changed the wire ,plug, dist cap, set the points, by the way does anyone have the proper gap for the plugs, I can;t find it anywhere ,I have them set at.35

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What type of plugs are you using?

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The Mangy Old Mutt

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The original spark plug gap is 0.025". Many of us use 0.040" gap. What happens when you switch plugs between cylinders? Is is possible that the plug is misfiring? Or that the plug is not grounding in the # 4 cylinder threads? Plugs need to be grounded to fire correctly.


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If you gap your plugs at .040" don't forget to bump your timing to 18 degrees.

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