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12-03-2010, 08:41 PM
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#1 |
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Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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HEI heat soak
Lately, after I have driven my truck for a day and have had multiple starts, the truck will just turn over and not start (or sound like its even getting spark). I have a timing light on me and i put it on to check for spark. The light doesnt flash. I had a can of starter spray and I sprayed it on the exposed coil to cool it of. It started right up. Why is my coil getting so hot? Does anyone have a wire diagram from the coil to the fuse box. Im thinking about running a new wire to the coil.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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12-03-2010, 08:47 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Denver, CO
Posts: 291
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Re: HEI heat soak
Improper wiring to an HEI is a common problem. Not sure if that would cause the coil to run hot though.
Have you recently made any changes to the electrical system?
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__________________________________________ Sean 1972 C20 2005 4Runner 
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12-04-2010, 04:57 AM
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#3 |
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Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: HEI heat soak
The system has been the same and untouched for 7 years. The coil is only 3 months old and the other coil was doing the same thing, which is why I swapped them. I just thought resistance in the wire might cause it to heat up.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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12-04-2010, 11:06 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Denver, CO
Posts: 291
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Re: HEI heat soak
I would start with the feed. Good instructions in the Electrical subforum FAQ
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__________________________________________ Sean 1972 C20 2005 4Runner
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12-04-2010, 12:13 PM
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#5 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,148
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Re: HEI heat soak
Are you using quality parts? Not unheard of to get a few bad parts. Check that your getting a full 12Vs to the coil.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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12-04-2010, 01:41 PM
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#6 |
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Msgt USAF Ret
  
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,715
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Re: HEI heat soak
You may need one of these or you may have your insulator in wrong.
http://www.summitracing.com/parts/MS...5&autoview=sku
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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12-04-2010, 08:15 PM
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#7 |
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Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: HEI heat soak
What is my insulator? I removed the ceramic piece when I converted from points (assuming that is what your refering to).
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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12-05-2010, 12:58 AM
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#8 |
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Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,715
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Re: HEI heat soak
It's the rubber washer in the center. The other part with the spring is the one I gave you the link to. You might want to consider just buying a new cap.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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12-05-2010, 11:22 PM
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#9 |
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Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: HEI heat soak
Vette Vet, im pretty sure that I have the graphite button piece under the rubber insulator.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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12-06-2010, 12:12 AM
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#10 | |
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Registered User
Join Date: Dec 2009
Location: DFW, TX
Posts: 764
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Re: HEI heat soak
Quote:
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12-06-2010, 12:44 AM
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#11 | |
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Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,715
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Re: HEI heat soak
Quote:
This shows the button so it should be easy to figure out how it goes.There may be a recess under the washer in the cap for the spring mount to to fit in. It's been awhile since I had one apart. I've got 3 or 4 out in the garage so I'll go look tomorrow.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. Last edited by VetteVet; 12-06-2010 at 12:48 AM. |
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12-06-2010, 09:11 AM
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#12 | |
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Registered User
Join Date: Aug 2009
Location: Denver, CO
Posts: 291
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Re: HEI heat soak
Quote:
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__________________________________________ Sean 1972 C20 2005 4Runner
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