Broken down chevelle - Chevelle Tech
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post #1 of 17 (permalink) Old Aug 16th, 19, 4:10 PM Thread Starter
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Broken down chevelle

70 chevelle just shut down as I was driving. All was fine and then there was no power. Gliding. Listening to tunes. Pull over, turns over. Won’t fire. Coil? It’s a GM HEI. bought a distributor 7 years ago. A component of it crapped out within a year. Made in China garbage. If there’s anything to try on the side of the road without tools, I’d appreciate any input. Thanks in advance
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post #2 of 17 (permalink) Old Aug 16th, 19, 7:28 PM
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Re: Broken down chevelle

replace module? I had one that would do that in my truck many years ago. I was changing module frequently. Decided that was stupid, biught anew distributor, it been fine for 12 years now.

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post #3 of 17 (permalink) Old Aug 16th, 19, 8:16 PM Thread Starter
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That’s what I replaced last time. Maybe that’s the problem and not the coil.
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post #4 of 17 (permalink) Old Aug 16th, 19, 8:33 PM
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Re: Broken down chevelle

Check the ground wire and clean it, if it isn't part failure it's always the damn ground.

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post #5 of 17 (permalink) Old Aug 16th, 19, 10:18 PM
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Re: Broken down chevelle

Per Dave Ray, coil shorted and took out the module!!
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post #6 of 17 (permalink) Old Aug 16th, 19, 10:38 PM
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Re: Broken down chevelle

Quote:
Originally Posted by sampoerna415 View Post
Check the ground wire and clean it, if it isn't part failure it's always the damn ground.
Where is the ground wire on an HEI distributor?

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post #7 of 17 (permalink) Old Aug 16th, 19, 11:30 PM
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Re: Broken down chevelle

Quote:
Originally Posted by Dean View Post
Where is the ground wire on an HEI distributor?
Think he may have been referring to the engine ground and not anything on the HEI.
I used to have a cheap distributor that was prone to burning up ignition modules.
Did two things to it and one or both fixed it. First I bought a good quality ignition module and I improved my engine grounds. Never burnt another.
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post #8 of 17 (permalink) Old Aug 17th, 19, 7:23 AM Thread Starter
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Re: Broken down chevelle

thank you, all. Where do you get quality parts? I got a standard motor products LX301T module last time. Lasted 4 years. The one that came with the AC Delco distributor lasted 16 months.
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post #9 of 17 (permalink) Old Aug 17th, 19, 8:21 AM Thread Starter
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Re: Broken down chevelle

never mind. Just found a great post from 1999 mentioning a napa module. off to get one...
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post #10 of 17 (permalink) Old Aug 17th, 19, 10:21 AM
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Re: Broken down chevelle

Quote:
Originally Posted by blm View Post
Think he may have been referring to the engine ground and not anything on the HEI.
I used to have a cheap distributor that was prone to burning up ignition modules.
Did two things to it and one or both fixed it. First I bought a good quality ignition module and I improved my engine grounds. Never burnt another.
If the engine didn't have a good ground, the starter would not operate.
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post #11 of 17 (permalink) Old Aug 17th, 19, 10:49 AM
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Re: Broken down chevelle

Quote:
Originally Posted by Dean View Post
If the engine didn't have a good ground, the starter would not operate.
Yeah true, but he was asking what he could do on the side of the road and it was just a thought. But doesn't the hei module ground through on of the bolt holes on the module itself? Or am I wrong on that?

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post #12 of 17 (permalink) Old Aug 17th, 19, 12:06 PM
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Re: Broken down chevelle

Quote:
Originally Posted by sampoerna415 View Post
Yeah true, but he was asking what he could do on the side of the road and it was just a thought. But doesn't the hei module ground through on of the bolt holes on the module itself? Or am I wrong on that?
You're not wrong. The module does ground through a hold-down screw to the cap. Terminal C on the module connects through an external wire that runs from the distributor base to the terminals on the cap and from there a metal connector that grounds the coil frame and coil neg lead that's held in place by the coil mounting screw. The distributor itself is grounded through the engine block.

The module comes with a tube of thermal transfer paste, make sure you apply it to the bottom of the module mounting base.

Leading cause for module failure is a defective coil. I always replace the coil when a module fails. A bad coil can test good, but when it hits a certain heat or load may start breaking down internally.

The windings in the pick up coil can fail or temporarily fail intermittently and cause a no run condition.
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post #13 of 17 (permalink) Old Aug 17th, 19, 12:24 PM
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Re: Broken down chevelle

Quote:
Originally Posted by jat70 View Post
thank you, all. Where do you get quality parts? I got a standard motor products LX301T module last time. Lasted 4 years. The one that came with the AC Delco distributor lasted 16 months.
Multiple module failures means you need to find the cause of that many failures.Start with a new coil at a minimum

John
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post #14 of 17 (permalink) Old Aug 17th, 19, 12:33 PM
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Re: Broken down chevelle

OK then, I agree, I suppose the module could possibly loose it's ground while driving but the HEI distributor itself gets it's ground from being bolted to the engine.

Every time I've had a module go bad it was always the same, engine running fine, shut it off, come back later and no start.

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post #15 of 17 (permalink) Old Aug 17th, 19, 1:05 PM
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Re: Broken down chevelle

Assuming you've allready pulled the cap off, but mine shut of just like that one day. The rotor literally came apart.
Cheap China HEI. $7 part cost me $80 tow. I was out in the middle of nowhere so couldn't get parts to fix on the spot.
Put an MSD HEI in it and it runs better too.
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