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08-02-2022, 01:28 AM | #1 |
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Join Date: May 2010
Location: Marietta, GA
Posts: 69
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new spark plugs jumping off 3# spark plug
I have a 1966 Ford Mustang with a 289 code A engine.
After a recent tune up the #3 spart plug wire started backing off the #3spark plug and ultimately jumps off the plug. A new spark and plug were tightly installed and still do the same. The #3 spark plug wire will still come loose. No other spark plug wires come off only #3. I know this may be heat caused but why only the #3 plug wire? Anyone have any experience or suggestions. I have tried to crimp the inside of the spark wire for a tighter fit, but it does not seem to help solve the problem. Appreciate any thoughts. ronford, a new member |
08-02-2022, 01:41 AM | #2 |
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Re: new spark plugs jumping off 3# spark plug
Did you install new plug wires at the same time? What was their source?
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08-02-2022, 06:29 AM | #3 |
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Join Date: Sep 2014
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Re: new spark plugs jumping off 3# spark plug
Does that spark plug have the screw on end cap, and is it on the plug, and the wire boot might be swelled.
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08-02-2022, 07:02 AM | #4 |
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Join Date: Apr 2019
Posts: 187
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Re: new spark plugs jumping off 3# spark plug
Does the plug wire have some slack between the wire loom holder and the spark plug?
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08-02-2022, 05:20 PM | #5 |
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Location: Kansas
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Re: new spark plugs jumping off 3# spark plug
I had a set of wires that did that. I believe the boots were made of some material that "gassed off" when hot and built pressure inside. I finally broke off a piece of toothpick and slid between boot and plug to vent the pressure....no more problem, and after a month or so the wires stayed on without the venting. Yeah...odd.
Terry
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08-02-2022, 05:53 PM | #6 |
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Re: new spark plugs jumping off 3# spark plug
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09-09-2022, 06:50 PM | #7 |
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Join Date: May 2010
Location: Marietta, GA
Posts: 69
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Re: new spark plugs jumping off 3# spark plug
To everyone:
I think i have solved my spark plug wire problem. I tried multiple brands of plugs and wires. With normal slip on installation force of the #3 wire on the #3 plug it would not stay on using Motorcraft wires or over the counter wires on an Autolite or on a Motorcraft plug. Finally, I took the over the counter spark plug wire off the #3 spark plug that was installed on the engine and forced it down on a "spare" spark plug until the rubber boot end of the wire almost touched the metal portion of the spark plug. This stretched the boot and make for a tighter fit. I left the spare spark plug in the rubber boot overnight to allow the fit to set. Then I installed the stretched #3 spark plug wire on the #3 spark plug (Motorcraft) and it stayed when the engine warmed up to operating temperature. Thank each of you for your thoughts on my problem I appreciate it very much. ronford |
09-09-2022, 10:08 PM | #8 |
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Re: new spark plugs jumping off 3# spark plug
In my extensive experience with spark plug cables, you always know when the cable-boot is pushed on far enough because you will feel the "click" when the plug wire electrode mates with the groove in the spark-plug electrode.
So, if you could push the boot down further, the plug electrode would be smashing the end of the cable. I would be concerned with your fix, that it might pop back off due to the pressure being put upon the end of the cable. |
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