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Most likely the timing is a little too high for low grade octane. Either go to a higher octane ( $$$$ ) or best, with a timing lite, just lower the timing till it stops knocking for the fuel that you are using.
Wiki User
∙ 15y ago
Spark knock in a 1992 Mercury Topaz 2.3 engine can be caused by a variety of factors such as using low-quality fuel with a low octane rating, incorrect ignition timing, carbon buildup in the combustion chamber, or a faulty knock sensor. Proper maintenance and using the correct fuel octane rating can help prevent spark knock in the engine.
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