Flashing check engine light reducing car or truck gas mileage New spark plugs and coils can help
Created on: 2022-04-09
Len explains how running rich can reduce fuel efficiency, and set off a check engine light, and what you can do to fix both!
Tools needed
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Socket Extensions
Scan Tool
Socket Driver
Spark Plug Gapping Tool
5/16 Inch Spark Plug Socket
Ratchet
Pocket Screwdriver
2001 Toyota Tundra 3-4L 3400 Ignition Coil Failure and Misfire
Learn all about Ignition Coils at This video is of a 2001 Toyota Tundra 3.4L with 200,000+ miles on the factory ignition coils. It has a bad ignition misfire causing the engine to run terrible. It turned on the "check engine light" on the dashboard, and the misfire gets far worse whenever it rains outside. As you can see in the video, the ignition coils are sparking externally against the valve cover. Every time there is a spark that you can see externally, the spark plug doesn't receive it, and the engine "misfires". Spraying the coils down with water makes the situation worse, but the diagnosis very easy.
