🏷️ Basic Information Identification Make: Pontiac Model: Grand Prix Year: 1990 Codes Chassis Code: W-Body 👋 Introduction Market Position Market Position: The 1990 Pontiac Grand Prix was a popular mid-size personal luxury coupe/sedan, known for its sporty styling and comfortable interior. This manual targets owners and independent repair shops seeking comprehensive, accurate repair data. Competitive Analysis Competitors: Competed with vehicles like the Ford Taurus, Chevrolet Lumina, and Chrysler LeBaron coupe. Key Features Key Features Of Manual: Vehicle-specific, factory-issued information, detailed step-by-step instructions, extensive illustrations and diagrams, wiring schematics, diagnostic procedures, and complete A-Z repair coverage. Manual Value Proposition Value Proposition: This manual is the definitive resource for maintaining, servicing, diagnosing, and repairing a 1990 Pontiac Grand Prix, empowering owners and technicians with factory-level knowledge to perform any repair correctly and efficiently. 📋 Manual Details Coverage Areas Coverage: All models and repairs A-Z Page Count Page Count: Not Specified (assumed comprehensive for a full service manual) Manual Type Manual Type: Factory Service and Repair Manual Language Language: English Format Format: Digital PDF Additional Features Zoom And Print: Images can be blown up and printed in enlarged copies. Convenience: Single PDF file, no need to flip through multiple books, print only needed pages. Accessibility Download Speed: Speed Download 📖 Manual Coverage Systems Covered Engine: Yes (including maintenance, diagnostics, repair) Control System: Yes (ECU, sensors, actuators) Mechanical: Yes (detailed mechanical components and procedures) Fuel System: Yes (including service specifications) Emission Control: Yes Intake Exhaust Cooling: Yes Lube: Yes (lubrication specifications and procedures) Ignition Starting Charging: Yes Automatic Transmission: Yes (clutch, transmission operation, repair) Manual Transmission: Yes Transfer Propeller Shaft: Yes Drive Shaft: Yes Differential: Yes Axle Suspension: Yes Tire Wheel: Yes Brake Control: Yes Brake: Yes Parking Brake: Yes Steering Column: Yes Power Steering: Yes Air Conditioning: Yes Supplemental Restraint System: Yes (SRS) Seat Belt: Yes Engine Immobilizer: Yes Cruise Control: Yes Wiper Washer: Yes Door Lock: Yes Meter Audio Visual: Yes Horn: Yes Windshield Glass Mirror: Yes Instrument Panel: Yes Seat: Yes Engine Hood Door: Yes Exterior Interior: Yes Electrical: Yes (comprehensive coverage including schematics) Multiplex Can Communication: Yes (likely covering early multiplexing systems for this era) Procedures Included Procedures: Maintenance, Servicing, Diagnosis, Repair, Troubleshooting, Component Replacement, Adjustment, Calibration Technical Depth Depth: Factory-level detail, step-by-step instructions, diagrams, illustrations, wiring schematics, specifications Wiring Schematics Wiring Schematics Coverage: Complete and detailed wiring schematics are included for all electrical systems. Diagnostics Diagnostic Procedures: Detailed diagnostic procedures for common faults and system malfunctions are provided, often including symptom-to-cause charts. Body And Interior Body And Interior Coverage: Includes procedures for body panel alignment, door mechanisms, interior trim removal and installation, glass replacement, and upholstery repair. 📊 Manual Specifications File Format File Format: PDF Print Quality Printability: Yes, all pages printable Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) Software Requirements Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac. Requires Adobe PDF Reader and Winzip (free). File Type File Type: PDF document ⚙️ Engine Specifications Primary Engine Engine Options 1990: 3.1L V6 (RPO LHO), 3.4L V6 (RPO LQ1 '3.4 SFI Twin-Cam' - available mid-year or in certain trims) Performance Engine Power 3 1L: Approx. 135 hp @ 4400 rpm (varied slightly by year/tune) Engine Torque 3 1L: Approx. 180 lb-ft @ 3200 rpm (varied slightly by year/tune) Fuel System Fuel System Type: Fuel Injection (Multi-Port Fuel Injection - MPFI) Engine Codes 3 1L V6 Engine Code: RPO LHO (2.8L for early W-body, 3.1L for later W-body, specific to 1990 Grand Prix) 3 4L V6 Engine Code: RPO LQ1 (3.4 DOHC V6, often referred to as 'Twin-Cam') Cooling System Cooling System Details: Covers radiator, water pump, thermostat, hoses, and coolant specifications and replacement procedures. 🔧 Transmission Standard Transmission Options: Typically 3-speed Automatic (THM-3T40) or 4-speed Automatic (4T60-E) depending on engine and trim. Optional Optional Transmission: Manual transmission was generally not offered on US-market Grand Prix models in 1990, emphasis was on automatics. Features Transmission Features: Features covered include torque converter operation, valve body diagnostics, electronic control (for 4T60-E), fluid service, and rebuild procedures. 📐 Dimensions Exterior Wheelbase: Approx. 107.7 inches Weights Curb Weight: Approx. 3100-3300 lbs (varies by model and options) 🛡️ Safety Features Ratings Safety Ratings Historical: As a 1990 model, official crash test ratings (like NHTSA's star ratings) were less standardized. However, it featured a robust body structure for its era. Active Features Active Safety Features: Front-wheel drive, Anti-lock Braking System (ABS) available as an option on certain models. Passive Features Passive Safety Features: Seat belts, padded interior surfaces, energy-absorbing steering column. Supplemental Restraint System (SRS) - airbags were optional or standard on higher trims/late models of this generation, but specific availability for 1990 Grand Prix should be verified against trim level. Seat Belt Features Seat Belt Type: Three-point retractable seat belts for front occupants, lap belts for...