Spark plug gap.

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Old 07-17-07, 07:15 AM
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Spark plug gap.

Gave my old trusty truck a tune up last night and was wondering. The old plugs looked decent except for the wear down of the electrode from many miles on them. The gap calls for .040 and the old ones had gotten to .050. What effect would this have on gas mileage and performance ??
 
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Old 07-17-07, 08:12 AM
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Wrong gap would prevent a proficient spark in the cylinders and could cause excess fuel not to be burned decreasing gas mileage and performance.
 
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Old 07-18-07, 12:37 PM
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Thanks. I knew it would do that but I just wondered how much of a drop I would get with .010 difference.
 
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Old 07-18-07, 12:49 PM
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It would vary depending on the engine even when new, and the condition of the engine and ignition system when not

It could range form barely quantifiable to barely running depending
 
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