GM Service Manual Online
For 1990-2009 cars only

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.

    â€¢ Hard Start
    â€¢ Surges /Chuggles
    â€¢ Lack of Power, Sluggishness, or Sponginess
    â€¢ Detonation/Spark Knock
    â€¢ Hesitation, Sag, Stumble
    â€¢ Cuts Out, Misses
    â€¢ Poor Fuel Economy
    â€¢ Rough, Unstable, or Incorrect Idle and Stalling
    â€¢ Backfire
    â€¢ Test the fuel system for correct operation, restriction, volume, and pressure. Refer to Fuel System Diagnosis and Fuel Pump Electrical Circuit Diagnosis .
    â€¢ Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    â€¢ Inspect the throttle body for coking. Refer to Throttle Body Cleaning .
    â€¢ Inspect for lean or rich conditions. Refer to P0171, P0172, P0173, or P0174 conditions for running the DTC.

Dieseling/Run On

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

    â€¢ Hard Start
    â€¢ Surges /Chuggles
    â€¢ Lack of Power, Sluggishness, or Sponginess
    â€¢ Detonation/Spark Knock
    â€¢ Hesitation, Sag, Stumble
    â€¢ Cuts Out, Misses
    â€¢ Poor Fuel Economy
    â€¢ Rough, Unstable, or Incorrect Idle and Stalling
    â€¢ Dieseling, Run-On

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

    â€¢ Surges /Chuggles
    â€¢ Lack of Power, Sluggishness, or Sponginess
    â€¢ Hesitation, Sag, Stumble
    â€¢ Cuts Out, Misses
    â€¢ Rough, Unstable, or Incorrect Idle and Stalling

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

    â€¢  Excess fuel in the EVAP lines and/or in the EVAP canister--Refer to Evaporative Emissions Hose Routing Diagram .
    â€¢ Integrity--Refer to System Testing in DTC P0442 .