The 2015 Nissan Altima has been a common midsize sedan on the road for over 8 years now. As these cars accumulate mileage, they eventually require regular maintenance like replacing the spark plugs. Replacing the spark plugs in the 2.5L 4-cylinder engine of the Altima is straightforward, but it’s important to tighten the plugs to the correct torque specifications to avoid problems that you could face in future.
In this article, we’ll look at the recommended torque specs for the 2015 Altima’s spark plugs so you can confidently handle this maintenance task. Properly torqued plugs will ensure efficient combustion and prevent issues like spark blowouts or thread damage.
We’ll also overview the spark plug replacement process on the 2.5L engine and provide some helpful tips along the way. Whether you’re a DIYer or a professional car expert, you’ll want to get the lowdown on proper spark plug torque on the Altima to keep this popular sedan to run smoothly.
Table of Contents
Recommended Torque Specs For 2015 Nissan Altima Spark Plugs Along With Instructions
- The 2015 Nissan Altima has a 2.5L inline 4-cylinder engine that requires iridium-tipped spark plugs for optimal performance and durability. The factory-recommended spark plugs are NGK Laser Platinum plugs.
- For 2.5L engines with the NGK plugs installed, the torque specification is 14-22 ft-lbs when installing new plugs. This torque range should be followed closely to avoid spark blowouts or damage to the cylinder head threads.
- Use a reliable inch-pound torque wrench during installation to precisely achieve the proper torque values. Tightening by hand or “eyeballing” the torque can easily lead to over- or under-tightening.
- Apply torque to the spark plug in two stages for the most accurate tightness. First torque to around 18 ft-lbs to initially seat the plug, then make a final pass to the full 14-22 ft-lbs spec. This may helps for any variances in the threading or gasket contact.
Factors You Should Consider
- Check the condition of the old spark plugs when removing them. Look for signs of corrosion, damaged insulators, oil fouling, etc. Any issues found may indicate problems like bad ignition coils, leaky valve cover gaskets, or rich fuel mixtures.
- Use anti-seize compound on the spark plug threads before installation. This prevents the plugs from seizing up over time and makes future removal much easier. Make sure to apply per the compound manufacturer’s instructions.
- Take care not to cross-thread the new spark plugs during installation. Start the threads carefully by using your hands before using the torque wrench. This is because damaged threads will require costly repairs.
- Consult your owner’s manual or factory service manual for Nissan’s official torque procedures and sequences. The reason for that is specs can differ for other engine configurations or model years.
Frequently Asked Questions About 2015 Nissan Altima Spark Plug Torque Spec
Q: Do the torque specs differ for the 4-cylinder and 6-cylinder Altima models?
A: Yes, the V6-equipped models have a higher torque range of 22-29 ft-lbs for the spark plugs. Always check the factory service manual for your specific engine.
Q: How often should I replace the spark plugs in my Altima?
A: Nissan recommends replacing the plugs every 60,000 miles. The plugs should also be inspected each and every time when a tune-up is done.
Q: Can I use different brands of spark plugs in my Altima?
A: For optimal performance and longevity, stick with NGK or factory Nissan plugs. Using other plugs may alter the torque specs.
Q: What tools do I need to torque the plugs effectively?
A: At a minimum, you’ll need an inch-pound torque wrench that is capable of 14-22 ft-lbs settings, a spark plug socket, and an anti-seize compound.