Ignition Coil Pack Spark Plugs Replacement for 4.0 and 3.5 V6

In this review the reviewer looks at the NPAUTO set of six ignition coils and six pre-gapped spark plugs aimed at V6 Nissan and Infiniti owners. The bottom line: this kit is for drivers who need a direct-fit replacement to cure misfires, rough idle, or poor fuel economy without hunting for individual parts. It installs like OEM units on compatible 4.0L and 3.5L engines and is presented as a complete coil-and-plug refresh to restore smooth starting and steady power.

Key Features

• Complete kit: Includes 6 ignition coils and 6 pre-gapped spark plugs, allowing a full-bank replacement in one purchase for V6 engines.
• Wide vehicle coverage: Fits a long list of Nissan, Infiniti and Suzuki models with 4.0L or 3.5L V6 engines, reducing compatibility guessing when the chart matches.
• OEM-style fit: Coils match common OEM part numbers such as UF349 and others, so they seat and plug in with the same routing and connector style.
• Improves drivability: Replacing both coils and plugs together addresses common symptoms like engine misfire, hard starts, rough idle and reduced power.
• Quality control: NPAUTO states the coils and plugs are produced to meet or exceed OEM standards, intended to deliver consistent functionality.
• Support and warranty: The package is backed by a two-year warranty and customer service for fitment or defect questions.

Who It's For

The kit is best for owners of compatible Nissan Frontier, Pathfinder, Xterra, Altima, Maxima, Murano, Quest, NV series vans and related Infiniti and Suzuki models who are experiencing misfires, rough idle, or poor fuel economy and want a straightforward, full-bank replacement. Mechanics and DIYers who prefer replacing all coils and plugs at once will appreciate the convenience of a matched set.

It is not aimed at drivers with engines outside the listed 3.5L or 4.0L V6 fitment or those who require individual aftermarket performance coils or exotic spark plug types. Always check the listing compatibility chart before buying to confirm correct part numbers.

Pros & Cons

Pros

• Fixes cylinder misfires and restores smooth idle when fit is correct.
• Parts match OEM numbers, helping ensure correct fit and wiring compatibility.
• Good value for a full set compared with buying coils and plugs separately.

Cons

• Only suitable for the specific 3.5L and 4.0L V6 models listed, so compatibility must be checked.
• Some buyers may prefer OEM-branded parts or different plug types for high-performance tuning.

Specifications

Brand	NPAUTO
Package contents	6 ignition coils and 6 pre-gapped spark plugs
Compatible engines	V6 4.0L and V6 3.5L models listed
Applicable vehicles	Nissan Frontier, Pathfinder, Xterra, Altima, Maxima, Murano, Quest, NV series; select Infiniti and Suzuki models
OEM part numbers matched	UF349, 224338J115, 224488J111 and related numbers
Warranty	2-year warranty and customer service

Our Verdict

The NPAUTO ignition coil and spark plug kit is a practical, value-oriented solution for owners of the supported Nissan and related V6 models who need to resolve misfires and restore drivability. When the compatibility chart confirms fit, this matched set simplifies repair and delivers OEM-style fitment and reliable function, making it a sensible buy for routine ignition system refreshes.

Frequently Asked Questions

Will this kit fix engine misfires?
Yes, replacing failed coils and worn spark plugs with this matching kit often resolves misfires, hard starting and rough idle when the parts are compatible with the vehicle.

Does the set fit my 2008 Nissan Xterra 4.0L?
If your Xterra is the 4.0L V6 model listed in the compatibility chart, this set is designed to fit; confirm the chart before purchase.

Are the spark plugs pre-gapped?
Yes, the package includes six pre-gapped spark plugs ready for installation in the specified engines.