Probably NOT the rotor, cap, wires or plugs. The tach signal comes from
the primary side of the ignition system. So if you are losing the tach you
are losing the primary, not the secondary (HT) side of the ignition system.
Don't forget to check the primary lead and ground lead inside the
distributor for breakage, they flex constantly and can break inside the
insulation.
Rick
On Thu, Mar 8, 2012 at 9:18 AM, Monte/Jane Morris <montejane@gmail.com>wrote:
> Thanks for the info. I'll check all connections and the rotor. Can you
> tell visually if the rotor is bad?
> Monte
>
>
> On Thu, Mar 8, 2012 at 6:40 AM, Richard Ewald <richard.ewald@gmail.com>wrote:
>
>> Tach drops out = ignition related.
>> Look at all the connections to make sure they are tight. Wiggle the wires
>> with the car running to see if you can duplicate.
>> Rick
>>
>> Sent from my iPhone
>>
>> On Mar 7, 2012, at 19:15, "Monte/Jane Morris" <montejane@gmail.com>
>> wrote:
>>
>> > Hi everyone.
>> > Every once in a while, at highway speeds, our 79B cuts out just for a
>> > second or two and then runs fine thereafter. It always runs great except
>> > for this "glitch" every once in a while. When it happens the tach
>> > immediately drops off sharply and then almost instantly resumes normal
>> > operation. Any ideas?
>> > desmogged 79B with points dizzy and dual HIF's. Coil replaced several
>> > thousand miles ago.
>> >
>> > Thanks,
>> > Monte
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>> >
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