Symptoms - Fuel System

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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 Cleaning Procedure . Inspect for lean or rich conditions. Refer to DTC P0171 OR P0172 conditions for running the DTC.
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 (EVAP) Hose Routing Diagram . Integrity-Refer to System Testing in DTC P0442 .