| Re: [GMCnet] 2nd last cylinder doesn't receive spark [message #324908 is a reply to message #324906] |
Fri, 13 October 2017 12:34   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
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Senior Member |
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Pertronix now have the one s that sense the lobe off the shaft, not as
efficient in timing as the 8 magnets, but we do not run into those problems.
On Fri, Oct 13, 2017 at 10:15 AM, Matt Colie wrote:
> Peer Oliver Schmidt wrote on Fri, 13 October 2017 10:12
>> My '73 isn't running happily.
>>
>> Replaced spark plugs, didn't change things.
>> Replaced distributor cap, didn't change things.
>>
>> Went ahead, and took each of the plug wires, plug an external spark plug
> into it. 6 of 8 cylinders produce a spark. The 2nd last on both sides do
>> not, i.e. 5 and 6 if you count from the left top.
>>
>> Changed distributor caps. Issue remains in 5 (and 6).
>>
>> Switched cables between 5 and 7, the issue remains in 5.
>>
>> I am out of ideas, and appreciate feedback from the combined GMCnet
> wisdom :)
>>
>> Thanks
>> --
>> Best regards
>>
>> Peer Oliver Schmidt
>
> Peer,
>
> Ready for a Way Out test??
> When you have the cap off you can see the ring that was added with the
> install of the Pertronix 1181. Take a small steel something, (I used a
> small
> screwdriver) and run it around the under surface of that ring. It should
> try to stick to 8 places on the way around. If it does not, there is your
> problem.
>
> While I have never had a Pertronix module fail, I did discover a missing
> magnet in a ring/rotor just once.
>
> We started that diagnostic by pulling the wire out of the cap and cranking
> and one in the party noticed a missing spark. (Unfortunately, I can't
> claim that one.) I was looking and thought it looked good. The above test
> found the issue.
>
> Other than that, I would be testing wires. That takes a VOM that can read
> megohms.
>
> Please let us know when you find it.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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