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SVTPerformance's Chain of Restaurants
Road Side Pub
Those with 5.4L 3V f-series trucks
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<blockquote data-quote="99BOSS" data-source="post: 13157229" data-attributes="member: 8733"><p>I had a idle sometimes that felt like a miss going on and when I floored it on the freeway, you could feel it stumble, ping some, and then finally begin to pull. Then one day I got the flashing engine light which means misfire. I isolated the cylinder, put 2 new COPs on since the code said cyl 1 then cyl 2. I then ran a bottle of lucas through it with some 89 gas instead of my usual 87. Now Im back to 87 and truck runs great. I had severe detonation there for a day or two while I was diagnosing the prob. This is due to carbon deposits in the cylinders. These deposits build up while casual driving with a misfire that you dont know you have. I hardly ever floor my truck so this allowed a buildup. These buildups create hot spots that will detonate. So everyone needs to blow these things out from time to time. Plugs could be going out too. I still have my originals and Im at 66K miles. But new COPs and getting some carbon burned out fixed my prob.</p></blockquote><p></p>
[QUOTE="99BOSS, post: 13157229, member: 8733"] I had a idle sometimes that felt like a miss going on and when I floored it on the freeway, you could feel it stumble, ping some, and then finally begin to pull. Then one day I got the flashing engine light which means misfire. I isolated the cylinder, put 2 new COPs on since the code said cyl 1 then cyl 2. I then ran a bottle of lucas through it with some 89 gas instead of my usual 87. Now Im back to 87 and truck runs great. I had severe detonation there for a day or two while I was diagnosing the prob. This is due to carbon deposits in the cylinders. These deposits build up while casual driving with a misfire that you dont know you have. I hardly ever floor my truck so this allowed a buildup. These buildups create hot spots that will detonate. So everyone needs to blow these things out from time to time. Plugs could be going out too. I still have my originals and Im at 66K miles. But new COPs and getting some carbon burned out fixed my prob. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Those with 5.4L 3V f-series trucks
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