🏷️ Basic Information

Make:

Kia

Model:

Optima

Year:

2005

Engine:

2.4L

Generation:

Second Generation (MG)

Chassis Code:

MG

👋 Introduction

Market Segment:

Mid-size sedan, competing with models like the Toyota Camry, Honda Accord, Ford Fusion, and Nissan Altima.

Key Selling Points 2005:

Stylish design, comfortable ride, spacious interior, good value proposition compared to some competitors.

Vehicle Platform:

Built on Kia's global platform, shared with Hyundai Sonata.

Design Philosophy:

European-influenced styling, designed under Peter Schreyer's direction.

📋 Manual Details

Coverage Areas:

Engine, Transmission, Drivetrain, Suspension, Steering, Brakes, Body, Electrical Systems, HVAC, Fuel System, Emissions Control, Diagnostics, Troubleshooting

Page Count:

Estimated 2000+ pages (typical for a comprehensive service manual)

Manual Type:

Service and Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Powertrain Components:

Engine mechanical, engine performance, lubrication system, cooling system, fuel system (injection, pumps, lines), emission control systems, exhaust system, manual transmission, automatic transmission, clutch, drive shafts, axles, differentials.

Chassis Components:

Suspension (front and rear), steering system (power steering, steering column), brake system (front and rear brakes, ABS, parking brake), wheels and tires.

Electrical Systems:

Battery, charging system, starting system, lighting (headlights, taillights, interior), instrument cluster, body control module (BCM), power windows, power locks, mirrors, wipers, horn, audio system, climate control electronics, engine control module (ECM) wiring diagrams.

Body And Interior:

Body panels, doors, hood, trunk, bumpers, interior trim, seats, airbags, seat belts, HVAC system operation, climate control diagnosis.

Routine Maintenance:

Oil and filter change, air filter replacement, fuel filter replacement, spark plug replacement, coolant flush and fill, brake fluid flush, power steering fluid replacement, transmission fluid and filter change, differential fluid change, belt inspection and replacement, wiper blade replacement.

Repair And Overhaul:

Engine assembly/disassembly, cylinder head service, piston and connecting rod service, crankshaft service, valve train service, transmission overhaul (manual and automatic), clutch replacement, brake caliper rebuild, rotor replacement, power steering pump replacement, alternator replacement, starter motor replacement, fuel injector replacement, oxygen sensor replacement, catalytic converter replacement, shock absorber and strut replacement.

Diagnostics And Troubleshooting:

Diagnostic Trouble Codes (DTC) interpretation, circuit testing, component testing, symptom-based troubleshooting, fuel system pressure testing, ignition system testing, electrical connector diagnosis, sensor testing (MAF, MAP, TPS, O2), actuator testing.

Body And Trim Repair:

Panel alignment, dent repair, rust repair, door panel removal/installation, seat removal/installation, airbag system safety precautions and replacement procedures.

Depth Of Information:

Comprehensive, covering everything from basic fluid changes to complete engine and transmission overhauls, including detailed diagnostic procedures and wiring diagrams.

📊 Manual Specifications

File Format:

PDF (Portable Document Format)

Print Quality:

High-resolution scans suitable for printing, with clear text and legible diagrams.

Binding Type:

Not Applicable (Digital PDF format)

Paper Type:

Not Applicable (Digital PDF format)

⚙️ Engine Specifications

Engine Code:

G4JP (often associated with this generation and engine size)

Engine Type:

Inline 4-cylinder, DOHC (Double Overhead Camshaft)

Displacement:

2.4 Liters (2351 cc)

Bore X Stroke:

86.0 mm x 100.0 mm (approximate, common for this engine family)

Compression Ratio:

9.5:1 (typical)

Horsepower:

Approximately 140-144 HP @ 5500-6000 RPM (Varies slightly by region/tune)

Torque:

Approximately 161-167 lb-ft @ 4000 RPM (Varies slightly by region/tune)

Fuel Delivery:

Electronic Fuel Injection (MPI - Multi-Point Injection)

Fuel Type:

Unleaded gasoline

Recommended Octane:

87 Octane (typically)

🔧 Transmission

Transmission Type:

5-speed Manual Transmission

Transmission Type:

4-speed Automatic Transmission with Overdrive

Automatic Transmission Control:

Electronically controlled

Automatic Transmission Fluid Type:

Kia Genuine ATF SP-III or equivalent (e.g., Dexron III/Mercon compatible, refer to manual for exact spec)

Automatic Transmission Fluid Capacity:

Approximately 6.9 quarts (6.5 liters) for a drain and fill, higher for complete overhaul.

📐 Dimensions

Length:

187.4 inches (4760 mm)

Width:

70.1 inches (1780 mm)

Height:

57.3 inches (1455 mm)

Wheelbase:

106.3 inches (2700 mm)

Front Track:

60.2 inches (1530 mm)

Rear Track:

60.0 inches (1525 mm)

Curb Weight:

Approximately 3300-3500 lbs (1497-1588 kg), varies by trim and transmission.

Gross Vehicle Weight Rating:

Typically around 4500 lbs (2041 kg).

Towing Capacity:

Not generally recommended for towing; consult owner's manual or Kia specifications for official ratings.

🛡️ Safety Features

NHTSA Front Impact Driver:

5-Star (for 2005 models, typically)

NHTSA Front Impact Passenger:

5-Star (for 2005 models, typically)

IIHS Side Impact Rating:

Good (for models equipped with side airbags)

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Optional Electronic Stability Control (ESC) / Traction Control System (TCS) on some trims.

Airbags:

Standard dual front airbags, optional front side-impact airbags and side-curtain airbags.

Seatbelts:

Pretensioner seatbelts with force limiters

💡 Technology Features

Audio System:

Base models featured AM/FM/CD player with 4 or 6 speakers. Higher trims offered premium audio systems with more speakers and subwoofer options.

Climate Control:

Manual climate control standard, optional automatic climate control on higher trims.

Cruise Control:

Standard on most trims.

Auxiliary Input:

Rarely found on base models; may be present on aftermarket head units or higher trims.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles (12,000 km) or 6 months, whichever comes first, using synthetic oil. Conventional oil interval may be shorter (e.g., 5,000 miles / 8,000 km). Refer to manual for exact recommendation based on driving conditions.

Air Filter Replacement:

Inspect every 7,500 miles, replace as needed, typically every 15,000-30,000 miles.

Spark Plug Replacement:

Typically around 60,000 - 100,000 miles for iridium spark plugs, consult manual for specific type and interval.

Coolant Replacement:

Initial change at 100,000 miles, then every 50,000 miles thereafter (for extended life coolant). Check manual for specific coolant type.

Engine Oil Type:

API SN/SP or ILSAC GF-6A certified synthetic engine oil, SAE 5W-30 is commonly recommended.

Engine Oil Capacity:

Approximately 4.5 quarts (4.3 liters) with filter change.

Coolant Type:

HOAT (Hybrid Organic Acid Technology) based coolant, typically a 50/50 mix with distilled water. Kia Genuine Long Life Coolant (Blue) is recommended.

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid.

Power Steering Fluid Type:

Kia Genuine Power Steering Fluid or Dexron III/Mercon compatible fluid.

Common Maintenance Items:

CV axle boots, sway bar links, engine mounts, rear wheel bearings, timing belt (if applicable, though this engine typically has a timing chain), power steering pump/lines (leaks).

Engine Performance Issues:

Occasional issues with MAF sensor readings, O2 sensors, and ignition coils can lead to poor performance or check engine lights.

📚 Vehicle History

Kia History:

Kia Motors Corporation is South Korea's second-largest automobile manufacturer, founded in 1944. Known for its evolution into a global automotive player with a focus on design, quality, and value.

First Generation Optima:

The first generation Optima (LDA, 2001-2006) was based on the Hyundai Sonata platform. The 2005 model year falls within this generation.

Second Generation Optima:

The second generation Optima (MG) was introduced for the 2006 model year, representing a significant redesign and platform update. This manual specifically covers the *end* of the first generation.

Manufacturing Location:

Primarily manufactured in South Korea at Kia's Hwaseong plant.

Sales Performance 2005:

Continued steady sales in North America and other key markets, establishing Kia's presence in the competitive mid-size sedan segment.

🏆 Awards & Recognition

Safety Awards 2005:

As noted in safety section, received top NHTSA ratings for front impact.

Consumer Reports Reliability:

Varies by model year and specific components; often rated average to below average in early years, improving over time. Detailed information available through Consumer Reports archives.

Emissions Certification:

Meets relevant EPA emissions standards for the model year.