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Old 01-16-2023, 11:27 AM   #1
Dan-K
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Engine shut off ?

I was puttering around on a new project (71 C10) with a 350 motor , was running like butter then I turned around to grab something out of the garage and it was like someone turned the key off ? no sputtering or rpm difference it just shut off and wouldnt re-start . Its getting fuel and has a new fuel filter . Has an HEI not points . Any Ideas ?
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Old 01-16-2023, 11:38 AM   #2
Rickjz
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Re: Engine shut off ?

The HEI has a module that can go out. It’s very common, so much so that I have been known to carry a spare in the glove box. You can test it.
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Old 01-16-2023, 02:10 PM   #3
72SB
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Re: Engine shut off ?

assuming fuel pressure is good, I suspect HEI module.

Have you confirmed you have spark OP?

By chance did the choke not open if it has one??
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Old 01-16-2023, 02:53 PM   #4
kwmech
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Re: Engine shut off ?

Put the putter back into it. You must've dropped it when you turned around.




couldn't resist
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Old 01-17-2023, 12:04 PM   #5
Dan-K
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Re: Engine shut off ?

Thanks for the advice , I will try the module.
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Old 01-17-2023, 12:14 PM   #6
72SB
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Re: Engine shut off ?

if you replace module, use heat sink paste under it. Its $2 at AutoZone
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Old 01-19-2023, 07:06 PM   #7
Dan-K
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Re: Engine shut off ?

Replaced the ignition module , still no start . Started messing around with the wires , found out the lead wire from the H.E.I. had somehow fallen out at the ignition cylinder ? plugged it back in and it fired right up ! Thanks to all those who commented and helped .
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Old 01-19-2023, 07:40 PM   #8
72SB
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Re: Engine shut off ?

keep the old module as a spare
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Old 01-19-2023, 10:34 PM   #9
Palf70Step
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Re: Engine shut off ?

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Old 01-19-2023, 11:34 PM   #10
rockyrivermark
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Re: Engine shut off ?

Diagnose the problem rather than throwing parts at it.

1. Check for spark. Timing light works well
2. If no spark check for 12V at HEI dizzy.
3. If 12 v at dizzy then try ignition module
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