Question about 1997 Ford F150 Regular Cab

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I drive a 1997 F-150 4X4 XLT. Satrday I filled up with regular unleaded gas, Monday while driving up an on ramp, I noticed my truck's engine making a knocking noise. Any ideas? I am leaning towards bad gas, but I dont want to be wrong and have major repair bills.

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  • Anonymous Oct 07, 2010

    I don't know how you define bad gas
    You need to provide more info on issue,
    and need to diagnose,regardless of fuel grade,etc.

  • dcause3 Oct 07, 2010

    I dont really know how else to describe the gas, other than it regular unleaded. I thought/ think that it might be a problem with the octane levels in the gas, so I filled up today and when I got home I put a bottle of octane booster in the gas. I will not know anything about if it worked until the morning. I hope it worked, but I would like to know what other reasons there mightbe causing a labor knock from the engine.



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Go with the bad gas until u know otherwise, add prem when u get to about 1/2 tank, if it still acts up u may have a problem

Posted on Oct 07, 2010

  • Robert Field Oct 09, 2010

    He is right on the solution, it happened to me about a month ago. My mechanic put in something called a Octane booster the brand was 104 . After just 15 minutes of driving it went back to normal. He said the reason for the 104 booster is that you get results faster and if you don't there is a problem. He did also say to use the booster only as needed, most newer engines run perfectly fine on Regular gas (85 to 87 Octane) or Medium grade (88 to 90 Octane). The need for Premium (91 Octane) in most newer engines is for the extra power i.e. towing or performance. He did say that every 4th tank or so Premium ( higher detergents) will clean out deposits behind in the engine. His rule of engine liters to determine octane needed under 4.0 L use regular, 4.0 L up to 5.7 L, use medium grade and premium for towing. And for above 5.7 L go premium only.

  • yadayada
    yadayada Nov 05, 2010

    You need to have a shop listen to this knock, most will do that for free or little cost, you might have carbon on the top of one or more pistons that is causing spark knock or you may have a piston, connecting rod or crankshaft bearing failing and making the noise, a trained ear can tell the difference.


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  • 4 Answers

You might check the fluid levels e.g.;your oil if it is to low your engine will knock

Posted on Nov 05, 2010


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