Infiniti FX35, FX45 Engine Service Repair Manuals

Infiniti FX35, FX45 (VQ35DE, VK45DE) Engine Service Repair Manuals is a complete guide to repair and maintenance of FX35 and FX45 engines. This manual covers all aspects of working with V6 (VQ35DE) and V8 (VK45DE) engines, including diagnostics, repair, adjustment and replacement of key components. The manual contains detailed diagrams, step-by-step instructions and troubleshooting recommendations, which makes it indispensable for mechanics and owners who want to service their cars themselves.

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The Infiniti FX35 and FX45 with the VQ35DE (3.5-liter V6) and VK45DE (4.5-liter V8) engines had some typical problems that can occur on these models. Let's look at the main ones:

1. Increased oil consumption (especially VQ35DE):

This is one of the most common problems with the VQ35DE engine. Many owners have reported that the engine starts to "eat" oil, especially at high mileage. This could be caused by worn piston rings or improper operation of the PCV system.

If the oil level is not monitored, this can lead to engine damage.

2. Timing chain wear (VQ35DE and VK45DE):

Both engines can experience wear on the timing chain and associated components such as tensioners and chain guides over time. A worn chain can cause increased engine noise, especially when cold, and eventually lead to serious damage if the chain jumps or breaks.

3. Catalytic converter issues:

The VQ35DE and VK45DE engines have cases of catalytic converter failure. Over time, the catalytic converter can break down and particles can get into the engine cylinders, causing serious damage. This is especially true for the FX35.

Symptoms of this problem include reduced power, oxygen sensor errors (lambda probe), and abnormal noise from the exhaust system.

4. Mass Air Flow (MAF) Sensor Issues:

Both engines have a history of MAF sensor failures, which can cause rough running, poor fuel economy, loss of power, and errors on the instrument cluster. This can usually be fixed by cleaning the sensor or replacing it.

5. Cooling System Issues:

Both engines can have issues with the radiator and thermostat in the cooling system. Over time, the radiators can leak, and the thermostat can become stuck in the closed position, causing the engine to overheat.

For the FX45, overheating can be especially dangerous for the V8 engine, as it is more sensitive to high temperatures. 6. Faulty Valve Cover Gaskets:

Valve cover gaskets often begin to leak, especially at high mileage. This causes oil to leak, which can get onto the spark plugs, causing ignition system malfunctions and potentially engine fires in rare cases.

7. Worn Spark Plugs and Ignition Coils:

Because both engines are high-performance, spark plugs and coils can fail more often than on other vehicles. Faulty plugs can cause misfires, which ultimately negatively affects engine performance and increases fuel economy.

8. Crankshaft and Camshaft Position Sensors:

These sensors can fail on both engines, causing the engine to have trouble starting or stalling. Faulty sensors often cause the instrument cluster to show errors and will need to be replaced.

9. Worn Water Pump:

Over time, the water pump can fail, causing coolant leaks and engine overheating. This is especially true for higher mileage models.

10. Throttle Body Issues (VQ35DE):

The throttle body on the FX35 can become dirty and malfunction, causing rough idling, acceleration issues, and even engine hesitation.

11. EGR (Exhaust Gas Recirculation) Issues**:

There are some EGR system issues that can become dirty, causing poor engine performance and instrument cluster errors. This usually requires cleaning or replacing the valve.

These problems may occur with the age and mileage of the vehicle. Regular maintenance and timely diagnostics help prevent serious breakdowns and extend the service life of the VQ35DE and VK45DE engines.