One way to tell if your engine responds positively to more initial advance is by hooking up a vacuum gauge to manifold vacuum before changing the initial timing. Let’s say your engine is ...

The manifold absolute pressure sensor reads the amount of pressure or vacuum (also called “engine load”) in the intake manifold, where outside air is divvied up in proper amounts and ...

Separating the crankcase from the intake manifold, which is a source of varying air pressure, the PCV valve maintains the optimal level of vacuum in the crankcase to extract the products of blow ...

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