Repeated Ignition Coil Failures

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bbogue
Posts: 595
Joined: Wed May 01, 2013 3:04 am

Repeated Ignition Coil Failures

Post by bbogue » Wed Sep 19, 2018 7:10 am

My 61, with mildly modified engine goes through about a coil per year. The symptoms are usually loss of power and occasional misfires. I have the Pertronix Ignitor 1 in the distributor and oil-filled Flamethrower coil, both wired with 12 volts. I’ve tried the MSD Blaster 2 coil as well, with a resistor. Both coil types have been found to be out of spec (primary and/or secondary resistance) after failure. Of note, even new coils have been found out of spec. Maybe a quality issue. My car does not have A/C and the coil bracket is attached to the front of the driver side engine head. The engine vibrates a little. My current plan is to try another Flamethrower coil, epoxy filled against vibration, and install a 3”X5” heat shield made of several layers of heat barrier material between the bracket and head with a nylon washer under the bracket bolt head. If this doesn’t improve my luck with coils, I’ll move it to a different location, off the engine. Wires are new, Taylor 10mm spiral wires. Engine grounds are multiple and good.
Comments and ideas will be appreciated.
Thanks.

Bill
VTCI# 12145
1961 Thunderbird - Heritage Burgundy Metallic
Music...
https://drive.google.com/open?id=0B-qNF ... zQ5c09UdEE

If there are no dogs in heaven, send me where they went. - Will Rogers

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RedBird64
Posts: 1566
Joined: Wed Oct 31, 2012 11:42 pm
Location: Bothell Wa.

Re: Repeated Ignition Coil Failures

Post by RedBird64 » Thu Sep 20, 2018 10:12 pm

I had them fail until I found out that a standard coil needs to be mounted upright and preferably off the eng.
So I moved up to a MSD "High Vibration" coil, which is still mounted on the eng. It's epoxy filled so nothing can move around in it and fail. So far, so good.

Image
1964 Coupe Wimbledon white/Rangoon Red w/black int. Owned for 41 years. It was my folks car before that (second owners). VTCI # 12013.

bbogue
Posts: 595
Joined: Wed May 01, 2013 3:04 am

Re: Repeated Ignition Coil Failures

Post by bbogue » Thu Sep 20, 2018 11:58 pm

Redbird,
From your comments it sounds like I might be on the right track by going to an epoxy-filled coil. I’ll still install a heat shield. It can’t hurt.

Thanks.

Bill

P.S. - If the rest of your car is anything like the picture you posted of your engine bay, it’s a stunner!
VTCI# 12145
1961 Thunderbird - Heritage Burgundy Metallic
Music...
https://drive.google.com/open?id=0B-qNF ... zQ5c09UdEE

If there are no dogs in heaven, send me where they went. - Will Rogers

User avatar
RedBird64
Posts: 1566
Joined: Wed Oct 31, 2012 11:42 pm
Location: Bothell Wa.

Re: Repeated Ignition Coil Failures

Post by RedBird64 » Fri Sep 21, 2018 12:08 pm

Thanks Bill, I appreciate the compliment!
1964 Coupe Wimbledon white/Rangoon Red w/black int. Owned for 41 years. It was my folks car before that (second owners). VTCI # 12013.

bbogue
Posts: 595
Joined: Wed May 01, 2013 3:04 am

Re: Repeated Ignition Coil Failures

Post by bbogue » Mon Oct 08, 2018 7:31 am

Update.
My recent misfire issue resolved itself after I replaced a cracked fairly new spark plug boot and decarbed the engine with Seafoam. The decarb was done when a cylinder was found to be 10% less in compression than the rest and also failed a leakdown test. I could hear air at the oil fill tube during the test which means rings broken or gummed up with carbon. I’m hoping for the latter. My engine had little use and no highway use for 6 months of this year which may have been the cause. Repeated decarbs with Seafoam, which I have used successfully on 2-stroke outboards, and a few 50+ mile trips I hope will be the cure. It runs pretty well. I’m not sure if the cracked boot or glowing carbon caused the misfire. I still plan to tweak the ignition by upgrading to Ignitor 2 module and epoxy coil.

Bill
VTCI# 12145
1961 Thunderbird - Heritage Burgundy Metallic
Music...
https://drive.google.com/open?id=0B-qNF ... zQ5c09UdEE

If there are no dogs in heaven, send me where they went. - Will Rogers

bbogue
Posts: 595
Joined: Wed May 01, 2013 3:04 am

Re: Repeated Ignition Coil Failures

Post by bbogue » Fri Oct 26, 2018 8:07 am

Progress report.
Seafoam through the carburetor while engine running plus cold soaks with Seafoam via the spark plug hole over several days followed by an oil change and an 80 mile run with Seafoam in the fuel has resulted in 35% leakdown vs 70% before treatment. Will keep Seafoam in the fuel and do another decarb through the carburetor soon. On the road to recovery I think. Issue was not a broken ring...just gummed up. Misfire obviously not caused by the coil. Was either the cracked spark plug boot or glowing carbon igniting fuel vapors. 6 months of infrequent, low rpm running was not good for my engine. It runs well now with little shake at idle.
Thanks.

Bill
VTCI# 12145
1961 Thunderbird - Heritage Burgundy Metallic
Music...
https://drive.google.com/open?id=0B-qNF ... zQ5c09UdEE

If there are no dogs in heaven, send me where they went. - Will Rogers

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