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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1550 (Engine Controls And Fuel - 3.5L (L66) - Introduction (2 Of 2)) >> Description and Operation >> Fuel System Description >> Engine Warm-Up Enrichment

Engine Warm-Up Enrichment

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

When the engine is cold, additional fuel is added in order to ensure good driveability. The level of initial enrichment is determined by the engine coolant temperature (ECT) sensor and intake air temperature (IAT) sensor input. The air/fuel mixture enrichment is gradually decreased until the ECT sensor reaches a specified value.

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