Symptoms - Fuel System. Chevrolet Equinox 2006

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 Equinox 🢒 Engine 🢒 Engine Controls - 3.4L 🢒 Symptoms - Fuel System

Table 1:

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 .

•	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 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 EVAP system for the following:

•	(EVAP) System for excess fuel in the EVAP lines and/or in the EVAP canister. Refer to Evaporative Emissions Hose Routing Diagram .

•	EVAP system for integrity. Refer to System Testing in DTC P0442 .

Poor Fuel Quality

Problem

Causes

Definition: During the fueling process a continual, occasional, or no fuel nozzle shut-off condition has occurred.

Difficult to fill

•	Fill limiter vent valve stuck closed

•	Evaporative emission (EVAP) canister restricted

•	EVAP vent valve stuck closed

•	Restricted vapor lines

•	High Reid vapor pressure or high fuel temperature

•	Fuel filler hose is pinched or kinked

•	Ignition switch ON. Vent Valve Closed

Over fill

•	Pressure relief valve stuck open or leaking

•	Fill limiter vent stuck open or leaking

Premature shut off of the fuel dispensing nozzle

•	Fill limiter vent valve stuck closed

•	EVAP canister restricted

•	EVAP vent valve stuck closed

•	Restricted vapor lines

•	High Reid vapor pressure or high fuel temperature

•	Ignition switch ON, EVAP vent valve closed

Fuel spitback

•	Restricted EVAP canister

•	High Reid vapor pressure or high fuel temperature

•	Ignition switch ON, EVAP vent valve closed