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 or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Compression Check

Compression Pressure Specifications:





UPDATED BY TSB# 21117, JAN. 1986
CAUTION:
(Gas engines only) Disconnect the wire from ignition coil terminal 1 before checking compression. If the wire is not disconnected on cars with LH-jetronic injection, ignition sparkover may occur, which can damage the ignition system control unit, or the Hall effect circuit inside the distributor.