| [GMCnet] HEI tip from Dick Paterson Springfield Ignition [message #343525] |
Mon, 20 May 2019 17:50  |
Gary Worobec
Messages: 867
Registered: May 2005
Karma:
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Senior Member |
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Hi, might be interesting for those of you with HEI ignition.
Read from bottom up.
Thanks
Gary
> On May 20, 2019, at 2:40 PM, Dick Paterson wrote:
>
> Good on you Gary --
> -if the hold down screw over the ground strap works loose it will create the arc burn you see. On our oval track distributors we touch the 2 front coil screws with JB Weld to prevent them from vibrating loose. Regards dick
>
> -----Original Message-----
> From: Gary Worobec [mailto:garytwmw@gmail.com ]
> Sent: May 20, 2019 5:16 PM
> To: Dick Paterson
> Subject: Re: HEI issue
>
> Replaced the HEI coil and it fired right up. I am going to change out the alternator and then get the old one tested and if OK use it as a spare. On the little ground strap inside the cap it looked like something had been arcing.
>
> Thanks for the help
>
> Gary
>
>> On May 16, 2019, at 7:36 PM, Dick Paterson wrote:
>>
>> Hi Gary -repeated -module failure is usually caused by a damaged coil-- the coil gets whacked with a voltage spike and shorts internally --once the shunt has burned into the internal coils wiring -it will shaort to ground . Every time it shorts it triggers the module ----now instead of its regular cycling it soars ,and gives up-
>> Sources for voltage spikes come from a bad diode in the alternators 6 diodes. Or from a battery charger on "start" setting putting out serious amps.
>> First I would have the alternator checked out at a shop . then I would change the coil
>> You can source the coil and module from your local parts store ---ask for a 75 or 76 chev camaro Z 28 --or corvette --or police HD for a 350 chev.
>>
>> When you put the cap back on --- be sure the 3 wire black plug is pushed up into the cap "solid" ---you should not see any brass terminal ends sticking out the bottom of the black plug. Regards dick
>>
>>
>>
>>
>> -----Original Message-----
>> From: Gary Worobec [mailto:garytwmw@gmail.com ]
>> Sent: May 16, 2019 9:49 PM
>> To: dick@paterson-gmc.com
>> Subject: HEI issue
>>
>> Hi Dick, bought an HEI distributor from you about ten years ago for my 73 GMC (455 with Howell EFI with the EBL). All ran great for 20000 miles. Last year it would not start. Changed the module and away we went. Yesterday we took the coach out for a run and after about 7 miles it just shut off. I had a new spare module and replaced it and still would not start. Lots of gas but no spark. Could it be the HEI coil in the distributor cap or possibly the pickup coil. Any thoughts. Can I source both those items locally or are they specific to your red HEI distibutor.
>>
>> Any help welcomed. I’ll give you a call about 10:00 am or so your time.
>>
>> Thanks
>>
>> Gary Worobec
>> Anza, CA, 92539
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