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2006 Civic Si Fuel Problem

 
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Old 07-08-2009
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2006 Civic Si Fuel Problem
My wife has been using regular grade fuel in my civic. Now there is a knock under the hood. Can anyone tell me what to do?
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Old 07-08-2009
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Re: 2006 Civic Si Fuel Problem
Don't use cheap fuel, the owners manual says to use premium fuel only (91 octane or better) , the reason why I didn't buy an SI.
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Old 07-08-2009
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Re: 2006 Civic Si Fuel Problem
its a K20 bro. it need 91 to run anything less and your be knockin the valves
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Old 07-09-2009
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Re: 2006 Civic Si Fuel Problem
as long as you don't drive like a NASCAR driver, you should be fine...but having regular gas for SI is not good....try premium gas and see what it does...
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Old 07-14-2009
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Re: 2006 Civic Si Fuel Problem
just curious..what kind of mpg where u getting running 87...useing 93 i get 34mpg
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