Getting no spark with HEI - Team Camaro Tech
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post #1 of 13 (permalink) Old Nov 20th, 07, 09:40 PM Thread Starter
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Getting no spark with HEI

I went to fire up the hot rod today and no go. I'm getting good fuel pressure and the plugs are clean. I checked for spark at the plugs and got nothing. I am getting some voltage drop at the coil wire (10.5V), however, my Holley Blue and 3 electric fans were running when I checked. I swapped the Accel HEI Super Coil (in-cap style) for a new one and still have no spark. Should I swap the ignition module? Do you guys have other thoughts on what to check?

Thanks. --Neil
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post #2 of 13 (permalink) Old Nov 21st, 07, 04:42 AM
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Re: Getting no spark with HEI

HEI needs a full 12 volts. Jumper in another battery?
All connections at HEI good? Those from the inside as well?
Good ground path from dist body to battery?
Rotor turning when cranking?
Spring & button still on coil? Making good contact?
Rotor have any carbon tracks?
I'd check the resistance of the pick-up coil, 1500 ohms or so.
If all above works, then replace the module.

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post #3 of 13 (permalink) Old Nov 21st, 07, 07:21 AM Thread Starter
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Re: Getting no spark with HEI

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Originally Posted by Everett#2390 View Post
HEI needs a full 12 volts. Jumper in another battery?
All connections at HEI good? Those from the inside as well?
Good ground path from dist body to battery?
Rotor turning when cranking?
Spring & button still on coil? Making good contact?
Rotor have any carbon tracks?
I'd check the resistance of the pick-up coil, 1500 ohms or so.
If all above works, then replace the module.
Thanks Everett. How do I check the pick-up coil resistance?
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post #4 of 13 (permalink) Old Nov 21st, 07, 08:31 AM
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Re: Getting no spark with HEI

Make sure you have good grounds and that the wires are secure for the coil.

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post #5 of 13 (permalink) Old Nov 21st, 07, 09:22 AM
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Re: Getting no spark with HEI

Quote:
Originally Posted by Neil B View Post
Thanks Everett. How do I check the pick-up coil resistance?
You're welcome. Remove the cap, unplug the module from the coil and use the DMM in OHMs function and measure across the coil terminals.

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post #6 of 13 (permalink) Old Nov 21st, 07, 09:39 AM Thread Starter
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Re: Getting no spark with HEI

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Originally Posted by Everett#2390 View Post
You're welcome. Remove the cap, unplug the module from the coil and use the DMM in OHMs function and measure across the coil terminals.
When you say measure across the coil terminals, do you mean across the terminals on the module pigtail that plugs into the coil?

Thanks again! --Neil
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post #7 of 13 (permalink) Old Nov 21st, 07, 05:58 PM
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Re: Getting no spark with HEI

Measure the coil leads, those leads disconnected from the module.

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post #8 of 13 (permalink) Old Nov 21st, 07, 06:39 PM
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Re: Getting no spark with HEI

Quote:
Originally Posted by Neil B View Post
I am getting some voltage drop at the coil wire (10.5V),
How did you test that? With just the key on, its a little low, but with the engine cranking, about normal.

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post #9 of 13 (permalink) Old Nov 26th, 07, 02:18 PM Thread Starter
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Re: Getting no spark with HEI

Hey guys,

I checked the pick-up coil resistance and got 840 ohms. I then swapped the module for a new one and it fired right up. I put a new cap and rotor on for good measure.

Thanks for your help!

--Neil
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post #10 of 13 (permalink) Old Nov 26th, 07, 02:20 PM Thread Starter
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Re: Getting no spark with HEI

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Originally Posted by undee72Z View Post
How did you test that? With just the key on, its a little low, but with the engine cranking, about normal.
I checked with the key on (fuel pump and electric fans running). Voltage at the battery was 12.4.
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post #11 of 13 (permalink) Old Nov 26th, 07, 04:53 PM
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Re: Getting no spark with HEI

Neil in your original post you said you measured 10.5 volts at the coil. If the battery is at 12.4, that's nearly 2 volts drop. If you are in fact running HEI, be certain you have given it a full 12 volt feed via a copper wire instead of the cloth covered resistance wire GM installed for breaker point ignition. That may have lead to a module failure and certainly will affect spark performance.

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post #12 of 13 (permalink) Old Nov 26th, 07, 05:20 PM Thread Starter
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Re: Getting no spark with HEI

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Originally Posted by dnult View Post
Neil in your original post you said you measured 10.5 volts at the coil. If the battery is at 12.4, that's nearly 2 volts drop. If you are in fact running HEI, be certain you have given it a full 12 volt feed via a copper wire instead of the cloth covered resistance wire GM installed for breaker point ignition. That may have lead to a module failure and certainly will affect spark performance.
Dave, it's definitely wired for 12 volts. I will continue to chase down the cause for the voltage drop.
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post #13 of 13 (permalink) Old Nov 27th, 07, 09:53 PM
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Re: Getting no spark with HEI

also, HEI coils req a 12-10 AWG primary wire for full coil saturation.....

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