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 Electronic Ignition (EI) System Diagnosis . Inspect the throttle body for coking. Inspect for lean or rich conditions. Refer to P0171, P0172, P0173 (if applicable) or P0174 (if applicable) conditions for running the DTC. See DIAGNOSTIC CODE INDEX .
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 Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2 Fuel Injector Coil Test
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 conditions: Excess fuel in the EVAP lines and/or in the EVAP canister-Refer to Emission Hose Routing Diagram . Integrity-Refer to System Testing in DTC P0442 .