Nissan Xterra Spark Plug DIY: Should You Replace Ignition Coils?

Nissan Xterra Spark Plug DIY: Should You Replace Ignition Coils?

Tearing into the top end of your Nissan Xterra takes up valuable weekend garage time, forcing you to wonder if swapping the ignition coils is worth the extra cash.

The Short Answer (TL;DR)

If your Nissan Xterra has high mileage, you should absolutely replace the ignition coils while doing a spark plug DIY. The job requires removing the upper intake plenum, which takes a few hours. Replacing the aging coils now prevents you from having to tear the engine down twice if an old coil fails later.

The DIY Process Overview

To replace the spark plugs on the VQ40DE engine, you must remove the upper intake manifold to access the passenger side cylinder bank. This involves disconnecting vacuum lines, the air intake tube, and unbolting the intake plenum. Once the manifold is completely out of the way, you simply remove the 10mm bolts holding the coils in place. Pull the coil packs out, and extract the old spark plugs using a standard 5/8-inch spark plug socket.

Why You Should Upgrade While You're In There

Since you already have the intake plenum removed to access the spark plugs, it is the absolute perfect time to install fresh high-performance ignition coils. Factory coils degrade over time through thousands of intense engine heat cycles, leading to weak spark, poor fuel economy, and eventual misfires. Installing a set of upgraded ignition coils ensures a robust combustion cycle and saves you from doing this exact teardown again next month.

Recommended Upgrade: High-Performance Ignition Coil Pack Kit

Frequently Asked Questions

Is removing the intake manifold on the Xterra difficult?

It is not mechanically complex, but it requires patience and organization. Be sure to label your vacuum hoses and always use a fresh intake manifold gasket during reassembly to prevent engine vacuum leaks.

Will new ignition coils improve engine performance?

Yes. Old factory coils lose maximum voltage output over time due to internal resistance and heat degradation. Fresh ignition coils deliver a consistently strong spark, which burns fuel more efficiently, smoothing out a rough idle and restoring factory throttle response.

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