Question about 1991 Ford Mustang

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What would cause 2 of my spark plugs to melt the electrode off ? both on the same side #3 and #7 on a 1991 5.0 thats in my 1996 f150

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Were they the same brand of plug wires?

Posted on Apr 08, 2011

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  • lentzer69 Apr 08, 2011

    yes all the wires are the same 8mm. i was wrong on the order tho its #5 and #7 the plugs were autolite double platinum gaped at .44,was only in for 1wk last night i put motorcraft plugs in. it runs good for now but the autolites also did for 3-4 days. i just dont want to tear anything up if there is something i can fix to make sure it dont happen again. thanks for your in put,this is my only means of transportation to make it to work.

  • lentzer69 Apr 08, 2011

    I also put new wires on last night.I dont know too much about these newer 5.0 motors all the sensors and ****,this is the first truck ive owend that had all that stuff. Ive always had 74,77,78,79 ford f150's. So now 2wks ago i decided to try my luck with a 96 and now this and to top it all off when i ran the block numbers it comes back as a 91,but thats how my luck runs.

  • Charles Huckeba
    Charles Huckeba Apr 08, 2011

    Running platinum plugs is your first mistake. That engine was not designed to run platinum plugs. Run a copper core, preferably motorcraft. The platinum plugs are designed to burn hotter, and while that may seem like a good thing, it has different applications. The plugs burn hotter and that is what causes the electrode to burn.

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