Thread: '98 Trans Am 40mpg
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Old 05-17-2022, 02:26 AM   #5 (permalink)
Drifter
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There are naturally aspirated diesels and they too have very low manifold vacuum. With no turbo they just don't get boost under load.

Old Mercedes diesels actually have a pump to create vacuum for things like the brake booster (and even door locks)
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