Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 402 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 3.8L - INTRODUCTION (2 OF 2))
2008 Pontiac Grand Prix Base
Section 402 (Engine Control System & Fuel System - 3.8L - Introduction (2 Of 2))
2008 Pontiac Grand Prix BaseSECTION Section 402 (Engine Control System & Fuel System - 3.8L - Introduction (2 Of 2))
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Repair Instructions
- Powertrain Control Module Replacement
- Crankshaft Position System Variation Learn
- Engine Coolant Temperature Sensor Replacement
- Mass Airflow Sensor/Intake Air Temperature Sensor Replacement
- Manifold Absolute Pressure Sensor Replacement
- Barometric Pressure Sensor Replacement
- Heated Oxygen Sensor 1 Replacement
- Heated Oxygen Sensor 2 Replacement
- Accelerator Pedal Position Sensor Replacement
- Throttle Body Assembly Replacement
- Throttle Body Cleaning
- Fuel Pressure Relief (Without CH 48027)
- Fuel Pressure Relief (With CH 48027)
- Fuel Pressure Gage Installation and Removal
- Metal Collar Quick Connect Fitting Service
- Plastic Collar Quick Connect Fitting Service
- Fuel Tank Draining
- Fuel Tank Replacement
- Fuel Tank Pressure Sensor Replacement
- Fuel Level Sensor Replacement
- Fuel Strainer Replacement
- Filler Tube Replacement
- Fuel Sender Assembly Replacement
- Fuel Hoses/Pipes Replacement - Filter to Tank
- Fuel System Cleaning
- Fuel Injection Fuel Rail Assembly Replacement
- Fuel Pressure Regulator Replacement
- Fuel Injector Replacement
- Evaporative Emission Canister Purge Solenoid Valve Replacement
- Evaporative Emission Canister Vent Solenoid Valve Replacement
- Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank
- Evaporative Emission Hoses/Pipes Replacement - Chassis/Canister
- Evaporative Emission Hoses/Pipes Replacement - Engine/Chassis
- Evaporative Emission Canister Replacement
- Ignition Coil Replacement
- Ignition Control Module Replacement
- Spark Plug Wire Inspection
- Spark Plug Wire Replacement
- Spark Plug Inspection
- Spark Plug Replacement
- Crankshaft Position Sensor Replacement
- Camshaft Position Sensor Replacement
- Knock Sensor 1 Replacement
- Knock Sensor 2 Replacement
- Secondary Air Injection Pump Replacement
- Secondary Air Injection Shut-Off Valve Outlet Pipe/Hose Replacement
- Secondary Air Injection Shutoff Valve Replacement
- Exhaust Gas Recirculation Valve Replacement
- Exhaust Gas Recirculation Inlet Pipe Replacement
- Exhaust Gas Recirculation Outlet Pipe Replacement
- Exhaust Gas Recirculation (EGR) System Cleaning
- Air Cleaner Element Replacement
- Air Cleaner Assembly Replacement
- Air Cleaner Inlet Duct Replacement
- Description and Operation
- Powertrain Control Module Description
- Notes
- PCM Function
- EEPROM
- Data Link Connector (DLC)
- Malfunction Indicator Lamp (MIL) Operation
- PCM Service Precautions
- Emissions Diagnosis For State I/M Programs
- Aftermarket (Add-On) Electrical And Vacuum Equipment
- Electrostatic Discharge (ESD) Damage
- Emissions Control Information Label
- Underhood Inspection
- Basic Knowledge Required
- Throttle Actuator Control (TAC) System Description
- Fuel System Description
- Fuel System Overview
- Fuel Tank
- Fuel Fill Pipe
- Fuel Filler Cap
- Fuel Sender Assembly
- Fuel Level Sensor
- Fuel Pump
- Fuel Strainer
- Fuel Feed Pipe
- Nylon Fuel Pipe
- Quick-Connect Fittings
- Fuel Pipe O-Rings
- Fuel Rail Assembly
- Fuel Injectors
- Fuel Pressure Regulator Assembly
- Fuel Metering Modes of Operation
- Starting Mode
- Clear Flood Mode
- Run Mode
- Acceleration Mode
- Deceleration Mode
- Battery Voltage Correction Mode
- Fuel Cutoff Mode
- Fuel Trim
- Evaporative Emission Control System Description
- Electronic Ignition (EI) System Description
- Secondary Air Injection System Description
- Exhaust Gas Recirculation (EGR) System Description
- Powertrain Control Module Description
- Special Tools and Equipment
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.