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Ford 9N, 2N & 8N Discussion Forum
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NAA skipping

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bama ray

06-16-2006 10:42:29




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I have a NAA that when running has a irregular skip will run smooth then skip then run smooth again, has plenty of power and starts with just a few turns of the starter…any ideals?




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Dell (WA)

06-16-2006 12:15:04




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 Re: NAA skipping in reply to bama ray, 06-16-2006 10:42:29  
Skippy..... ....BAD IGNITION WIRES. replace'em $10 (cheap)

Heres the deal, ignition wire insulation gitts old and drys out and cracks. Them lazy sparkies leak out the crack, and whooops, amiss. But its is always inconsistant untill really bad.

Always use copper-core sparkie wires. DO NOT USE modern anti-radiostatic carbon core sparky wire 'cuz the glassy carboncore cracks inside the insulation where you can see it and causes un-explained misses..... ...Dell, yer self-appointed sparkie-meister

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dan hill

06-17-2006 03:50:17




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 Re: NAA skipping in reply to Dell (WA), 06-16-2006 12:15:04  
Naa wires are short and well away from the block.I would look at gas fouling of the spark plugs,cross firing in the dist cap, rotor breaking down.If the clip under the rotor is missing the rotor will be flopping around and usually breaks itself or the cap.Ive seen 8ns and 600s that had a spark jump from the coil output to to either coil terminal.Looking at the ignition in the dark while the engine is running will show arcing.I have seen a model A that had barbed wire for ignition wires, ran ok.Carbon core wires can be checked with an ohmmeter.They measure about 10000 ohms per foot.These wires give trouble when carbon is lost from the wire ends and arcing starts, this destroys more carbon until the wire is open .No need for this wire on tractors.Spark plugs can arc to their shells on occasion, probably due to a cracked insulator.I watched a mechanic work on a Pontiac that wouldnt start.He made a few checks and replaced the distributor cap, the car started right up.I looked the cap over carefully, couldnt see any thing wrong.It dosent cost much to keep a new cap on hand.I have a spare for my pickups.

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Dan

06-16-2006 12:03:47




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 Re: NAA skipping in reply to bama ray, 06-16-2006 10:42:29  
Valve sticking or worn distributor bushings are the highest percentage causes.

Dan



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