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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Backfires
DEFINITION: Fuel ignites in intake manifold, or in exhaust system, making a loud popping noise.
CHECK:
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Spark plugs.
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Output voltage of
ignition coils, using a spark tester J-26793 (ST-125), or equivalent.
-
Ignition system.
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Compression, look for valve train problem, valve timing etc.
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Intake manifold gasket leak, TBI gasket to manifold leak.
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A/C VSV not functioning properly.