The Elusive Vacuum Leak
RAY: What he did by hooking up the spark-plug wires incorrectly and running the engine was, he made it
backfire through the intake manifold. And when that happens and you get combustion taking place in the manifold, he saw a puff of smoke. And he found the gasket that was blown.
TOM: Boy, that's very good!
RAY: Do we have a winner this week?
TOM: It's Regina Warren from Suffern, New York. Congratulations!
[ Car Talk Puzzler ]