2003 Infiniti G35 Coupe Specs

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2003 Infiniti G35 Coupe Specs

The 2003 Infiniti G35 Coupe, a sporty and stylish vehicle, has become a popular choice for car enthusiasts. However, like any car, it has its quirks and requires proper maintenance to keep it running smoothly. This article dives into the specifics of the 2003 G35 Coupe, focusing on common problems, practical troubleshooting, and essential maintenance tips for both owners and mechanics.

2003 Infiniti G35 Coupe: Key Specifications

Before tackling any maintenance or repairs, it's crucial to understand the basic specifications of the 2003 G35 Coupe. This includes engine options, drivetrain, and other key components:

  • Engine: 3.5L VQ35DE V6 engine
  • Horsepower: 280 hp (Automatic) / 298 hp (Manual)
  • Torque: 270 lb-ft
  • Drivetrain: Rear-Wheel Drive (RWD)
  • Transmission: 5-Speed Automatic or 6-Speed Manual

Common Issues and Troubleshooting

1. Oil Consumption

Symptom: Excessive oil consumption, requiring frequent top-ups. Blue smoke from the exhaust is another telltale sign.

Cause: The VQ35DE engine in the 2003 G35 Coupe is notorious for oil consumption issues. This can be due to worn piston rings, valve stem seals, or even the PCV valve. Think of this like a Subaru Boxer engine, known for similar issues.

Solution:

  • Check and Replace PCV Valve: A clogged PCV valve can increase crankcase pressure, forcing oil past the seals.
  • Oil Change with High Mileage Oil: Using a thicker, high-mileage oil can sometimes help reduce oil consumption by swelling the seals slightly.
  • Engine Flush: A gentle engine flush can help remove sludge buildup that may be contributing to the problem.
  • Valve Stem Seals Replacement: This is a more involved repair, but it can significantly reduce oil consumption if the seals are the culprit.
  • Piston Ring Replacement: In severe cases, the piston rings may need to be replaced, which is a major engine overhaul.

Note: Monitor oil levels regularly, especially after performing any repairs related to oil consumption.

2. Camshaft and Crankshaft Sensor Failure

Symptom: Engine stalling, rough idling, difficulty starting, or a check engine light (CEL) illuminated with codes P0335 (Crankshaft Position Sensor) or P0340 (Camshaft Position Sensor).

Cause: These sensors are crucial for timing the engine's firing sequence. Over time, they can fail due to heat, vibration, and exposure to contaminants. Similar to a faulty mass airflow sensor in a Honda Civic, they disrupt the engine's performance.

Solution:

  • Diagnostic Scan: Use an OBD-II scanner to confirm the fault codes and identify the specific sensor that has failed.
  • Sensor Replacement: Replace the faulty sensor with a new, OEM-quality part. Aftermarket sensors can sometimes be unreliable.
  • Wiring Inspection: Inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as needed.

3. Catalytic Converter Failure

Symptom: Check engine light (CEL) with codes related to catalytic converter efficiency (e.g., P0420), decreased fuel economy, and a sulfur-like smell from the exhaust. This is not dissimilar to issues seen in older Toyota Camrys.

Cause: Catalytic converters can fail due to age, overheating, or contamination from excessive oil consumption. A failing converter restricts exhaust flow, impacting performance.

Solution:

  • Diagnostic Scan: Confirm the catalytic converter failure with an OBD-II scanner.
  • Visual Inspection: Inspect the catalytic converter for physical damage or excessive corrosion.
  • Converter Replacement: Replace the faulty catalytic converter with a new or re-manufactured unit. Consider upgrading to a high-flow converter for improved performance (check local emissions regulations first).

Note: Address the root cause of the catalytic converter failure (e.g., oil consumption) to prevent future issues.

4. Automatic Transmission Issues

Symptom: Slipping gears, rough shifting, delayed engagement, or the transmission going into limp mode. This is a common complaint with older automatic transmissions, similar to what you might find in an early 2000s BMW.

Cause: Low transmission fluid, worn clutch packs, faulty solenoids, or a failing valve body can all contribute to automatic transmission problems.

Solution:

  • Fluid Level Check: Check the transmission fluid level and condition. If the fluid is low or dark and burnt, it needs to be changed.
  • Transmission Fluid Change: Perform a transmission fluid and filter change using the correct fluid specified for the G35 (typically Nissan Matic K or S).
  • Solenoid Replacement: If specific shift solenoids are failing, they can be replaced individually.
  • Valve Body Repair/Replacement: A faulty valve body can cause a variety of transmission issues. It may need to be repaired or replaced.
  • Transmission Rebuild/Replacement: In severe cases, the transmission may need to be rebuilt or replaced.

Note: Regular transmission fluid changes are crucial for preventing premature transmission failure. Consider changing the fluid every 30,000-60,000 miles, depending on driving conditions.

5. Suspension and Steering Issues

Symptom: Clunking noises from the suspension, poor handling, uneven tire wear, or play in the steering wheel. Think about worn ball joints or tie rod ends in any vehicle; the G35 is no exception.

Cause: Worn ball joints, tie rod ends, control arm bushings, and struts/shocks are common culprits.

Solution:

  • Visual Inspection: Inspect the suspension and steering components for any signs of wear, damage, or play.
  • Ball Joint and Tie Rod End Replacement: Replace worn ball joints and tie rod ends to restore proper steering and handling.
  • Control Arm Bushing Replacement: Replace worn control arm bushings to improve ride quality and handling.
  • Strut/Shock Replacement: Replace worn struts/shocks to improve ride quality and handling.

Note: A wheel alignment is recommended after any suspension or steering component replacement.

6. Electrical Issues

Symptom: Intermittent electrical problems, such as malfunctioning power windows, door locks, or lights. Also, issues with the Bose sound system are common.

Cause: These issues can be caused by corroded wiring, faulty switches, or a failing Body Control Module (BCM). The Bose amplifier is known to fail due to heat.

Solution:

  • Wiring Inspection: Carefully inspect the wiring harnesses and connectors for any signs of corrosion or damage. Clean or repair as needed.
  • Switch Replacement: Replace faulty switches that are causing electrical problems.
  • BCM Diagnosis: Diagnose the Body Control Module (BCM) using a professional scan tool to identify any faults. Replace the BCM if necessary.
  • Bose Amplifier Repair/Replacement: Consider repairing the existing amplifier or replacing it with an aftermarket unit.

Preventative Maintenance for Long-Term Reliability

The best way to avoid major problems with your 2003 Infiniti G35 Coupe is to follow a strict preventative maintenance schedule. Here are some key maintenance items:

  • Regular Oil Changes: Change the engine oil and filter every 3,000-5,000 miles, depending on driving conditions. Use a high-quality synthetic oil that meets Nissan's specifications.
  • Transmission Fluid Changes: Change the automatic transmission fluid and filter every 30,000-60,000 miles.
  • Coolant Flush: Flush and replace the coolant every 30,000 miles. Use the correct coolant type specified for the G35.
  • Brake Fluid Flush: Flush and replace the brake fluid every 2-3 years to prevent corrosion and maintain optimal braking performance.
  • Power Steering Fluid Flush: Flush and replace the power steering fluid every 2-3 years.
  • Air Filter Replacement: Replace the engine air filter every 12,000-15,000 miles.
  • Spark Plug Replacement: Replace the spark plugs every 60,000 miles.
  • Inspect Belts and Hoses: Regularly inspect the drive belts and hoses for any signs of wear or cracking. Replace them as needed.

Keeping Your G35 Coupe in Top Condition

Maintaining a 2003 Infiniti G35 Coupe requires attention to detail and a proactive approach. By addressing common issues promptly and following a regular maintenance schedule, you can ensure that your G35 remains a reliable and enjoyable car for years to come. Always use quality parts, consult a reputable mechanic when needed, and keep detailed records of all maintenance and repairs. Addressing potential issues early is more cost-effective in the long run and will help you avoid more significant problems down the road. Regular inspections, coupled with timely repairs, will help extend the life of your vehicle and maintain its performance. Remember, a well-maintained G35 is a happy G35.

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