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 Pump Electrical Circuit Diagnosis and Fuel System Diagnosis . Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (With Special Tool) . Inspect the throttle body for coking. Inspect for lean or rich conditions. Refer to P0171, 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 the following diagnostics: Fuel Injector Coil Test Fuel Injector Balance Test with Special Tool Fuel Injector Balance Test with Tech 2
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: EVAP System for excess fuel in the EVAP lines and/or in the EVAP canister EVAP system for integrity-Refer to DTC P0442 .