Vehicles using VQ35HR engine list:

Engine VQ35HR

Symptoms:
- Rough idling or misfires
- Reduced engine power or hesitation during acceleration
- Oil leaks around the valve cover or intake manifold
- Excessive oil consumption
- Check Engine Light (CEL) illumination, often with codes related to camshaft position or misfires

Diagnosis:
- Inspect for oil leaks at valve cover gaskets and intake manifold gaskets, common wear points on the VQ35HR
- Perform a compression test to check for cylinder sealing issues
- Scan for diagnostic trouble codes (DTCs) related to camshaft position sensors or variable valve timing (VVT) system faults
- Check ignition coils and spark plugs for wear or failure, as misfires are common
- Examine the timing chain tensioner and guides for wear or noise, as timing chain issues can cause performance problems

Fixes:
- Replace valve cover gaskets and intake manifold gaskets if leaking to prevent oil contamination and maintain proper sealing
- Replace worn spark plugs and faulty ignition coils to restore smooth engine operation
- Repair or replace camshaft position sensors or VVT solenoids if faulty to ensure proper valve timing
- Service or replace timing chain tensioner and guides if wear or noise is detected to prevent timing chain failure
- Address oil consumption by checking PCV valve function and replacing if clogged or faulty

Prevention:
- Regular oil changes with high-quality synthetic oil to maintain proper lubrication and reduce wear on timing components
- Periodic inspection of gaskets and seals to catch leaks early
- Replace spark plugs and ignition components at recommended intervals to avoid misfires
- Monitor engine performance and promptly address any check engine light warnings
- Use OEM or high-quality replacement parts to ensure reliability and longevity of repairs