Spark Plug Gap Specifications
Spark plug gap affects combustion, fuel economy, and cold starts. New plugs sometimes ship at the wrong gap. Here’s how to check and set the correct spec.
ASE Master Technician
Derek Winslow
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articles
Verified author
About
Owner of a five-bay shop in Denver focused on European imports. Spent a decade as lead technician under the same roof before buying the business from his mentor in 2018 — a shop built on Volkswagens, BMWs, and the kind of repeated failures that teach you more than any training course. ASE Master Technician across eight categories, with an L1 Advanced Engine Performance certification earned after a methodical second attempt. European drivetrain diagnostics follows different logic than domestic work, and most of the generic advice you'll find online misses that. The content here doesn't.