Regular vs Super
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Junior User
Joined: Nov 2006
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From: rural wv
Regular vs Super
Has anybody ever had any performance problems running regular octane gas in their 3v 5.4 . Mine had a miss at an idle, and also under a load. 2 dollar bottle of octane boost, and she's purring like a kitten.
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
I run 87 octane, I don't get any better performane or fuel economy using 89 or 93 octne fuel.
Check your truck for pending codes. You probably have a misfire in one cylinder that smooths out a bit when you use higher octane fuel. You probably have a COP or spark plug going bad.
Check your truck for pending codes. You probably have a misfire in one cylinder that smooths out a bit when you use higher octane fuel. You probably have a COP or spark plug going bad.
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Joined: Dec 2006
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From: Oxford, NC
Over the years I've had to progress from 87 to 89 to 93. I ran the better part of a can of seafoam through my tank 4 tanks ago and have been running nothing but 87 ever since. My mileage is still about 13mpg and no miss/knock at idle or under load. Before the seafoam if I didn't run 89 (better yet 93) I'd have miss/knock unless I ran octane boost/fuel system cleaner every other tank. Your miss/knock could be a number of things and most likely what redford said about plug or COP, the bummer about a COP is finding the bad one.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Thread Starter
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Junior User
Joined: Nov 2006
Posts: 61
Likes: 0
From: rural wv
thanks Redford, I've got to get the oil changed in about another 1000 miles if it is a cop i'll get my buddy at the garage to check it out.
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FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
It's a good suggestion to try a can of Seafoam first, it might just be a little crud buildup causing the need for high octane fuel.
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