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What causes my 1998 f-150 4x4 4.6liter spark knock at highway speeds in hot weather it doesn't knock in lower temps such as 70 degrees f?
Wiki User
∙ 14y ago
There could be many causes, but the first one that comes to mind is that the fuel you are using MAY NOT have the "proper additives" for the weather conditions you're experiencing.
Usually, all major refiners and/or local fuel distributors "blend" additives into fuels to compensate for the changes in climate in a given area. If the blenders are "going cheap" and not adding the necessary chemicals, or the wrong ones, or the wrong amounts, then this can cause all kinds of issues with engine performance, only one of which is knocking.
Wiki User
∙ 14y ago
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