Tool Review: Good Vibrations Spark Doctor Spark Plug Tune-Up Tool

Key Features:
 +   Multiple sockets for common spark plug sizes
 +   Tool tension is easily adjustable
 -   Slightly too bulky to carry in a pocket


There are a lot of multi tools on the market that are useful for many things. Some multi tools are designed for fishing, others for camping or hunting or gun maintenance, and still others for sailing.  There are countless multi tools designed for general repair or installation work. However, there are not a lot of multi tools aimed at spark plug repair or replacement. One multi tool that fills that void is the Good Vibrations Spark Doctor spark plug tune-up tool.

You can find combination spark plug gappers and gauges just about anywhere, but the Spark Doctor multi tool comes with many other tools as well as those two. This is a good multi tool to have if you work with spark plugs, whether they are plugs for lawn mowers, chain saws, or other power equipment. (For auto spark plugs, you will probably want something more robust, with longer reach.)  It is especially handy for anyone who works on the go and might not have access to a full toolbox all the time.

The Spark Doctor multi tool includes a ramp-style gauge that is marked in both inches (0.01" to 0.06") and millimeters (0.4mm to 1.5mm).  The gauge extends upward from the body of the tool and can be pushed back down when not in use. The numbers are clearly marked but can be hard to see in certain light.

In addition to the gauge, this tool includes a spark plug gap adjuster (similar to the gappers found on many other gauges), a pick, a file, a spark plug wrench that can accommodate three different standard sized plugs (5/8", 3/4", and 13/16"), and a cleaning brush. Except for the gauge, each of the tools swivels outward, and the tension on the tools can easily be adjusted with a Phillips screwdriver to make them easier or harder to pivot out. The tension on the gauge can also be adjusted, so each person can set this tool up with the pressure that they like best.

The wrench is sturdy and the socket locks on securely, but it can also be easily removed. The tool can be folded up and stored either with the socket attached to the wrench, or with it unattached. The brush is strong, and should last a long time. This tool is large—larger than a standard pocket knife or multi tool—and heavy enough that most people probably won't want to carry it around in their pocket. It does have a hole punched into the bottom so you can hang it from a hook, post, or nail. Most of the tool's weight comes from the wrench body and the metal casing, and when you heft it you can quickly tell that it's not made of cheap plastic.

The Good Vibrations Spark Doctor spark plug tune-up tool is a good buy for anyone who routinely works on spark plugs and engines, or for anyone who thinks they might need to. It's a great tool to keep in a glove box, trunk, or shed, so you'll have it close by when you need it, especially when you don't have convenient access to other tools.  The Spark Doctor is currently listed on Amazon.com for $16.54 (eligible for free shipping).

(Originally posted in a similar version on Helium.com, January 2013)