Symptoms - Fuel System. Chevrolet Uplander

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 Uplander - 4WD 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Symptoms - Fuel System

Fuel System

Symptoms

Fuel System

Find the symptom in the left column and perform the test/inspection procedure in the right column, be sure to review each cell of the table to identify all tests for a symptom.

•	Hard Start

•	Surges/Chuggles

•	Lack of Power, Sluggishness, or Sponginess

•	Detonation/Spark Knock

•	Hesitation, Sag, Stumble

•	Cuts Out, Misses

•	Poor Fuel Economy

•	Rough, Unstable, or Incorrect Idle and Stalling

•

Backfire

•	Test the fuel system for correct operation, restriction, volume, and pressure. Refer to Fuel System Diagnosis and Fuel Pump Electrical Circuit Diagnosis .

•	Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

•	Inspect the throttle body for coking. Refer to Throttle Body Inspection and Cleaning .

•	Inspect for lean or rich conditions. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Dieseling/Run On

Test the fuel system for excessive fuel pressure. Refer to Fuel System Diagnosis .

•	Hard Start

•	Surges/Chuggles

•	Lack of Power, Sluggishness, or Sponginess

•	Detonation/Spark Knock

•	Hesitation, Sag, Stumble

•	Cuts Out, Misses

•	Poor Fuel Economy

•	Rough, Unstable, or Incorrect Idle and Stalling

•	Dieseling, Run-On

Test for proper operation of the fuel injectors. Refer to Fuel Injector Diagnosis .

•	Surges/Chuggles

•	Lack of Power, Sluggishness, or Sponginess

•	Hesitation, Sag, Stumble

•	Cuts Out, Misses

•	Rough, Unstable, or Incorrect Idle and Stalling

Inspect the evaporative emission (EVAP) system for the following:

•	Excess fuel in the EVAP lines and/or in the EVAP canister. Refer to Evaporative Emissions Hose Routing Diagram .

•	Integrity--Refer to System Testing in DTC P0442 .