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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0351 - P26C8) And Symptoms) >> Diagnostic Information And Procedures >> DTC P050D: Cold Start Rough Idle >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify that the fuel pressure is not too low or too high - Refer to Fuel System Diagnosis .
    • If a condition is found 

      Repair or replace components as necessary

    • Go to next step: If the fuel pressure is OK 
  2. Verify that the fuel is not contaminated - Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Go to next step: If the fuel is not contaminated 
  3. Replace fuel injectors as indicated by high misfire counts.
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