HEI incap coil bad? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blazerparts · 01-07-2006, 02:52 PM

Truck ran like a scalded dog last night. This morning no ignition spark. Could the coil have failed? any way to test? comments? ideas?

thanks

jhow66 · 01-07-2006, 05:33 PM

More than likely module. Take it with you and the parts place will test it for you.

corn · 01-07-2006, 05:44 PM

I agree^

bighead · 01-07-2006, 06:28 PM

My old HEI equiped 79 Chevy PU crapped out on a cold cold night in October several years ago on the way to the Chickasha, OK swap meet. Thankfully a guy stopped to help and he had with him a cap and coil. I popped it on and was running in minutes. He told me, and I followed his instructions to always carry a spare cause they were know to fail when you need them the most.

shifty · 01-07-2006, 06:56 PM

Just make sure you hook up all three wires for the coil. Some people only hook up the two that come attached to the coil. If you don't hook up the third you'll burn the coil up.

Tx Firefighter · 01-07-2006, 07:32 PM

It's a good policy to change the module and coil at the same time.

Sometimes, the coil will burn up several modules before it fails itself. It makes the mechanic look bad because he keeps changing the module and it fails soon after. Changing both coil and module at the same time covers both bases and helps make sure you don't get stranded.

blazerparts · 01-07-2006, 09:18 PM

Thanks all. I changed the module and the coil and it fired right up.

blazerparts · 01-07-2006, 09:18 PM

Thanks all. I changed the module and the coil and it fired right up.

krue · 01-07-2006, 11:14 PM

Good deal.

FRENCHBLUE72 · 01-08-2006, 12:51 PM

yep I just went through this ordeal also...

cableguy0 · 01-08-2006, 01:01 PM

all ignition parts wear at about the same rate. running worn out plugs or wires and cap and rotor will stress the coil and module both. its good practice that if the parts on there arent fairly new to just do a full tune up when you change the coil and module

01-07-2006, 02:52 PM	#1
blazerparts No,I DON'T have Tourett's Join Date: Mar 2005 Location: Reno, NV Posts: 556	HEI incap coil bad? Truck ran like a scalded dog last night. This morning no ignition spark. Could the coil have failed? any way to test? comments? ideas? thanks __________________ '72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater

01-07-2006, 05:33 PM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: HEI incap coil bad? More than likely module. Take it with you and the parts place will test it for you. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-07-2006, 05:44 PM	#3
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: HEI incap coil bad? I agree^

01-07-2006, 06:28 PM	#4
bighead Registered User Join Date: Nov 2005 Location: McKinney, Texas Posts: 465	Re: HEI incap coil bad? My old HEI equiped 79 Chevy PU crapped out on a cold cold night in October several years ago on the way to the Chickasha, OK swap meet. Thankfully a guy stopped to help and he had with him a cap and coil. I popped it on and was running in minutes. He told me, and I followed his instructions to always carry a spare cause they were know to fail when you need them the most.

01-07-2006, 06:56 PM	#5
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: HEI incap coil bad? Just make sure you hook up all three wires for the coil. Some people only hook up the two that come attached to the coil. If you don't hook up the third you'll burn the coil up. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

01-07-2006, 07:32 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: HEI incap coil bad? It's a good policy to change the module and coil at the same time. Sometimes, the coil will burn up several modules before it fails itself. It makes the mechanic look bad because he keeps changing the module and it fails soon after. Changing both coil and module at the same time covers both bases and helps make sure you don't get stranded. __________________ I'm on the Instagram- @Gearhead_Kevin

01-07-2006, 09:18 PM	#7
blazerparts No,I DON'T have Tourett's Join Date: Mar 2005 Location: Reno, NV Posts: 556	Re: HEI incap coil bad? Thanks all. I changed the module and the coil and it fired right up. __________________ '72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater

01-07-2006, 11:14 PM	#9
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: HEI incap coil bad? Good deal. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

01-08-2006, 12:51 PM	#10
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	Re: HEI incap coil bad? yep I just went through this ordeal also... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

01-08-2006, 01:01 PM	#11
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: HEI incap coil bad? all ignition parts wear at about the same rate. running worn out plugs or wires and cap and rotor will stress the coil and module both. its good practice that if the parts on there arent fairly new to just do a full tune up when you change the coil and module __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



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