RON
This was originally written up in an excellent technical presentation by Duane Simmons for a GMCMI convention.
It is posted on the GMCMI site at
http://www.gmcmi.com/wp-content/uploads/2015/06/Ignition-System_simmons_lamey.pdf http://www.gmcmi.com/wp-content/uploads/2015/06/Ignition-System_simmons_lamey.pdf
Look for the section on electrical mismatch problem.
I think his explanation is easier to follow.
Emery Stora
77 Kingsley
Frederick, CO
>
> What colors do the Toronados and GMCs use? I'm having a little trouble
> following all those combinations.
>
> Thanks,
> Ron
>
> On Mon, 20 Feb 2017 04:29:54 -0700 Bruce Hart
>> Ignition coils and pickup coils should be considered a "matched
>> set", that
>> is, you need to look at the color codes on each part and match the
>> codes
>> to each other, and to the vehicle/engine family the distributor
>> will be
>> used in. Failure to use the appropriate color codes may result in
>> poor
>> starting and misfiring at low speed. The brand names listed are
>> for the
>> ENGINES, not the CARS--a Chevy-designed engine in a Buick car uses
>> the
>> Chevrolet color codes, not the Buick color codes. For V-8 engines,
>> there
>> are three color codes for the pickup coils: Yellow tyrap
>> (early) or
>> Yellow plastic connector (later) on the wires. Used on Chevrolet;
>> Cadillac;
>> and Olds engines in Toronado Blue tyrap (early) or Black
>> plastic
>> connector (later) on the wires. Used on Buick; and all Olds
>> engines
>> except those in Toronados. The lead wires are slightly longer than
>> those
>> used on the "yellow" pickup coil. Clear or NO tyrap (early),
>> Clear or
>> NO plastic connector (later) on the wires This is identical to
>> the
>> Blue/Black color code, except the wires are even longer to fit a
>> Pontiac
>> distributor There are two color codes for the in-cap ignition coils:
>> Red and Yellow wires Used on vehicles that use the Yellow coded
>> pickup
>> coil. (CHEVY, Cadillac, Toronado) Red and White wires Used on
>> vehicles that use the Blue/Black, or Clear pickup coils One of the
>> more
>> common problems in that HEI is the wires going into the pickup coil
>> right
>> at the coil itself. (The yellow and green wires). They break inside
>> the
>> insulation where they go into the coil because that coil is
>> constantly
>> being rotated slightly by the vacuum advance. The constant bending
>> of those
>> wire breaks them. I suspect yours has had the biscuit. Remove the
>> distributor and Replace the pickup coil whether that is the problem
>> or not.
>> (I suspect it is however) I replaced the pick up coils in vehicles
>> that had
>> more than 50000 miles since being done as part of a major tune up.
>> (Distributor removed, cleaned, lubed, weight friction points
>> polished, and
>> vacuum pot tested for operation).
>>
>>
>> One other thing to check. Remover distributor cap and rotate the
>> rotor.
>> The rotor should spring back with no hesitation if it doesn't your
>> distributor shaft is gunked up and it will need to be disassembled,
>> cleaned
>> and lubed.
>>
>> On Mon, Feb 20, 2017 at 3:59 AM, gene Fisher
>>
>>> I get mine from dick Patterson
>>>
http://www.gmcmhphotos.com/photos/gmc-chemicals-and-
>>> tools/
p37219-delco-igniton-module-made-in-the-usa.html
>>>
>>>
>>>
>>>
>>> On Sun, Feb 19, 2017 at 7:53 PM Rob Mueller
>>
>>>
>>>> Robert,
>>>>
>>>> Just tell them you have a 1976 Toronado.
>>>>
>>>> Regards,
>>>> Rob M.
>>>> The Pedantic Mechanic
>>>> USAussie - Downunder
>>>> AUS '75 Avion - The Blue Streak TZE365V100428
>>>> USA '75 Avion - Double Trouble TZE365V100426
>>>> USA '77 Kingsley - TZE 267V100808
>>>>
>>>> -----Original Message-----
>>>> From: Gmclist [mailto:gmclist-bounces] On Behalf
>> Of
>>> Robert
>>>> Peesel
>>>> Sent: Monday, February 20, 2017 2:34 PM
>>>> To: gmclist
>>>> Subject: [GMCnet] GMCI parts interchange problem
>>>>
>>>> All, I am trying to get to the parts interchange on the gmci
>> website. I
>>>> have registered and logged in, but am unable to get to the parts
>>> database.
>>>> I
>>>> am trying to get the correct part numbers for the ignition
>> module and
>>> coil
>>>> for my 76 Royale. If anyone has those numbers I would
>> appreciate it!
>>>> I am going to head to O'reilly's tomorrow and pick them up. If
>> they are
>>>> the
>>>> solution, at least I will have spares.
>>>>
>>>> Bob
>>>>
>>>> --
>>>> Robert Peesel
>>>>
>>>> 1976 Royale 26'
>>>>
>>>> Side Dry Bath
>>>>
>>>> Morrison, Colorado
>>>>
>>>> _______________________________________________
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>>>>
>>>> _______________________________________________
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>>> --
>>> Gene Fisher -- 74-23,77PB/ore/ca
>>> �Give a man a fish; you have fed him for today --- give him a
>> URL and
>>> -------
>>>
http://bdub.net/gmcmotorhome.info/
>>> Alternator Protection Cable
>>>
http://bdub.net/gmcmotorhome.info/APC.html
>>> _______________________________________________
>>> GMCnet mailing list
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>>>
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>>
>>
>>
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> Milliken, Co
>> GMC=Got More Class
>> _______________________________________________
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>
>
> Ron & Linda Clark
> North Plains, ORYGUN
> 78 Eleganza II
>
>
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