PROCEDURE OR ACTION:
1. Common problems that may cause rich codes:
Clogged/dirty air filter
Fuel quality (Very high butane content)
Operation at high altitudes
High primary fuel pressure (for trim fuel injector)
Faulty trim fuel injector or wiring
Faulty LPG carburetor (power valve stuck open)
Faulty LPG regulator
Manifold vacuum leaks
Improper ECU grounds on engine block
Faulty ECU injector driver 2
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