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Discussion Starter · #1 ·
My 1992 Volvo 240 is having tons of engine knocking. Any time I press the gas, I hear my engine knocking. The engine is the stock that comes with the car (4 cyl, inline). So I got two questions:
1. Will changing from 87 to 91 octane actually make the difference?
2. I suspect a greater problem than the octane rating since this has been a growing problem. What would cause such a problem and how much would it cost to fix it? (Is it worth it aswell?)

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