HEI problems - Team Camaro Tech
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post #1 of 7 (permalink) Old Jul 26th, 09, 07:43 PM Thread Starter
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Jeff
 
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Unhappy HEI problems

Help needed! I keep blowing ignition coils and sometimes even the control module every 800 to 1000 miles. I can tell its going out when the car is harder to start. 350 engine don't know distributor type except HEI. I have installed new #10 wire to distributor, have checked grounds, both bonding strap and bonding ground wire is attached at coil any suggestions gladly appreciated. I just changed coil and module today so we could go for a ride Thanks
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post #2 of 7 (permalink) Old Jul 26th, 09, 08:02 PM
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Bill
 
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Re: HEI problems

Well my old g/f's son had a Caddy that had a simular problem, I swapped everything and it kept happening so I changed the distributor itself and problem was solved.
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post #3 of 7 (permalink) Old Jul 26th, 09, 08:17 PM
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Bill
 
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Re: HEI problems

Jeff,
When you take the coil cover off, there should be a brass ground strap attached to one screw that goes to the plug on the side of the distributor cap ? If that is missing it will cause the problems you are having. Here is what it looks like:

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post #4 of 7 (permalink) Old Jul 26th, 09, 08:25 PM Thread Starter
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Jeff
 
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Re: HEI problems

Strap is there and also bonding ground wire on top of coil
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post #5 of 7 (permalink) Old Jul 27th, 09, 05:26 AM
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Bill
 
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Re: HEI problems

Jeff,
Make sure there is a good ground wire from the engine to the frame or neg battery ? Other than that, are you using AC Delco parts or aftermarket ? I wont use anything but AC Delco ignition parts on a GM application.

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post #6 of 7 (permalink) Old Jul 27th, 09, 08:20 AM
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Re: HEI problems

As BillK suggests, the module and coil should be of the same brand, the parts are matched for each other.

Most aftermarket coils have a lower impedance and draw more current than the designed 5 amps of OE module, hence the module overheats and dies.

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post #7 of 7 (permalink) Old Jul 27th, 09, 06:59 PM Thread Starter
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Jeff
 
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Re: HEI problems

Thanks for the info I will try it and hopefully I won't be posting in 1000 miles with the same problem Thanks again
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