Author Topic: Coil Pack Question  (Read 184 times)

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Offline Hill1430

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Coil Pack Question
« on: July 24 2022, 11:20:49 PM »
Went to remove my coil pack to replace it. What I found was some industrial strength light green goo. I think it would take forever to try to clean up this mess. I found an ignition module on Rock Auto, GM Genuine for $149.00. The part number is the same as AC Delco. I hate to spend the money, but it might be a better option. Thoughts? Also I tried to post a photo taken from my iPhone, but am having no luck.
1987 Grand National Work in progress
2019 Shelby GT350

Offline Scoobum

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Re: Coil Pack Question
« Reply #1 on: July 24 2022, 11:31:21 PM »
109 235 Cubic Inch Stock Stroke Balanced Rotating Assembly
Stock Crank
TRW .030 Pistons
Stock Rods
Stock Timing Chain/Gears
212/212 Flat Tappet Cam
JB Racing Heads
Stock Rockers
5.7 TT Race Chip
Built 2004R
AC 16930
6262 JB

6.72 at 104.67-25 PSI

I see slow people

Offline Hill1430

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Re: Coil Pack Question
« Reply #2 on: July 24 2022, 11:53:46 PM »
WOW. Thanks for the video. I guess I need to replace both. Surprised the car ran good when I parked it almost three years ago.
1987 Grand National Work in progress
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Offline Steve Wood

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Re: Coil Pack Question
« Reply #3 on: July 25 2022, 10:02:45 AM »
I have found that when the coil goes bad (some times the sign is that the resistance of each coil pack is no longer between 11-13000 ohms-this is probably 80% true as an indicator), it puts a strain on the module so that it may fail sometime after.  Therefore, it's a good idea to go ahead and be prepared to change it as well.

Gooey potting compound as yours was, tells you that the module has been overheating and is well on its way to failure.

When the module fails, it does not always mean the coil is fixing to but it won't hurt to change it if you want to.  If the coil was still in range, put it on the shelf because some of the new stuff may not last nearly as long as the original.

If the coil fails, it puts a lot of strain on the module and that means it probably should be replaced as a preventative measure.  Again, if it was running okay when you discovered it, I would put it on the shelf as back up just in case as I said about the coil :)
Steve Wood

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Offline Hill1430

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Re: Coil Pack Question
« Reply #4 on: July 25 2022, 10:33:27 AM »
Thanks! I will save it if I can clean the goo off of it.
1987 Grand National Work in progress
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Offline Scoobum

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Re: Coil Pack Question
« Reply #5 on: July 25 2022, 11:01:37 AM »
You can test the coil pack as I'm doing here. Even if it tests good it might not be. Introduce heat to the equation and things can change. I tested coil packs at the track. If I could do a WOT blast down the track and it revved out clean, only then would I call it good and keep it as a spare. I'd have coil packs pop a coil at WOT every now and again and drop 2 cylinders. It'd be like I threw a boat anchor out the window the car slowed so fast.

https://www.youtube.com/watch?v=B9zHzfIcN8A
109 235 Cubic Inch Stock Stroke Balanced Rotating Assembly
Stock Crank
TRW .030 Pistons
Stock Rods
Stock Timing Chain/Gears
212/212 Flat Tappet Cam
JB Racing Heads
Stock Rockers
5.7 TT Race Chip
Built 2004R
AC 16930
6262 JB

6.72 at 104.67-25 PSI

I see slow people

Offline Steve Wood

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Re: Coil Pack Question
« Reply #6 on: July 25 2022, 11:52:50 AM »
Thanks! I will save it if I can clean the goo off of it.

If it is gooey, it's toast
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Hill1430

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Re: Coil Pack Question
« Reply #7 on: July 25 2022, 12:55:55 PM »
you guys are great! thanks for the help.
1987 Grand National Work in progress
2019 Shelby GT350

 

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