A Novato homeowner was doing what countless classic car owners do on a weekend — trying to coax a long-dormant engine back to life in his garage. A strange chemical smell on the first attempt should have been a warning sign. Instead, a second try on the ignition ended in an engine bay explosion, a spreading hillside fire, and a two-alarm response from local firefighters. Here’s what actually happened, and why old muscle cars carry this exact risk.