Importance of correct spark plug gap? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 11-28-2005
IN2 FX4's Avatar
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Importance of correct spark plug gap?

I have always gapped my spark plug within the factory specs. I recently changed the spark plugs in my Ranger and after I had removed three from the right side (the tough ones) I realized I left my gapping tool at my shop with my race car. The minimum gap is spec'd at .062" so I decided to use a 1/16" drill bit to gap the plugs. The next day I measured the the drill to make sure it was right and it was .059". I forgot drills are a little under sized.

Now my question is: Is this gap being .003" under the spec really going to have any effect on the engine performance? It is running just fine but I have not gone through enough gas yet to determine if it has effected my gas mileage. Could it possibly effect emissions?

When I put an electronic ignition on my race car it was recommended that I increase the spark plug gap to around .035" or more. When I ran it on the dyno, the results showed that a .025" gap gave better horsepower.

I don't want to change the gap because it is too much trouble but I just wondered if anyone had information that a .059" gap would give me problems.

Last edited by IN2 FX4; 11-28-2005 at 03:32 PM.
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Old 11-28-2005
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I wouldn't worry. Your talking about 3000'ths of an inch. Pull them in a year & check the gap. I highly doubt anything has changed. As to performance & mileage? Plugs are designed to operate within a "range" of gap. Your well in that gap.

Robin...
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Old 11-28-2005
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Gapping is slightly more important on the DIS ignition we have because two plugs fire simultaneously and they are in series with one another.

However, the difference here amounts to 5 precent or so and I'm not sure you have anything to worry about.
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Old 11-29-2005
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Thanks guys. That is along my same line of thinking but wanted to find out if anyone knew of a valid reason to go to the trouble of going back in and reseting the gap. I feel confident now that they are OK as is.
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