2005 Nissan Titan: Cylinder 6 Misfire After a Spark Plug Job
2005 Nissan Titan 5.6L V8 · over 250,000 miles · July 2026 · mobile repair in the Flagstaff area
The problem
The truck started misfiring on cylinder 6 shortly after its spark plugs were replaced.
What we found
We scanned the truck on site and confirmed the cylinder 6 misfire was caused by a bad ignition coil pack — not the new plugs.
What we did
Replaced the cylinder 6 coil pack, then rescanned the truck.
The result
The rescan came back clean — the misfire was resolved, and the truck never had to go to a shop.
The takeaway
A misfire that shows up right after a tune-up isn't always the new parts. On a high-mileage engine, the coil feeding that cylinder can be the real failure — testing first saves replacing parts that are fine.
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