Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la
If it fails: lemon-manuals.org.ua

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Vacuum Regulator


1. Disconnect vacuum line from distributor port and connect a vacuum gauge.
2. With engine at idle, the vacuum gauge reading should be within 1 inch Hg vacuum of the calibration point. The calibration point of each valve can be identified according to color code as follows: Black, 6 inches Hg; green, 7 inches Hg; red, 8 inches Hg.
3. Replace valve if not within specifications.