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Todays fuel injected computer conttoled cars no change should be needed. Even my carb motorcyle only needed fuel/air ask if I were to have stayed @ 6000 ft or more. I don't believe old cars would need timing change only air/ fuel mix if you run proper octane which can be a lower requirement at altitude.

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11y ago
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Anonymous

Lvl 1
3y ago
Yes non computerized engined DO need timing advanced more than the factory spec setting for high altitude, otherwise the engine won't run as well and mpg will suffer. Advance between 1/2 - 1 full degree per 1,000 feet in elevation, reduce for engine knock

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