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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls - Tests W/Codes - V8) >> Trouble Codes >> Code 44, Lean Exhaust Indication (Except 4.3L Turbo) >> Diagnostic Aids

Diagnostic Aids

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Using scan tester, observe Block Learn Memory (BLM) value at different RPMs. If Code 44 conditions exist, block learn value will be around 150-172.

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